Re: [AMRadio] 75-A4
So Barrie, hows a ballpark price? Russ. From: "Barrie Smith" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: , "SAMRC" <[EMAIL PROTECTED]> Subject: [AMRadio] 75-A4 Date: Fri, 7 Mar 2003 19:44:30 -0700 Hello: Will be selling my second-to-last 75-A4 soon. Thought I'd but it here first, before putting it "somewhere else". I want/need a new pair of speakers for my stereo system, but the XYL is geeting real hard-nosed about more "stuff" without getting rid of stuff. I'm not a Collins collector, so I may not know the correct way to describe the unit. In my opinion, it's in very nice condition, both electrically and cosmetically. I'm the second owner. It has all known (to me) upgrades (by Collins). Has original owners manual. Has three filters installed, including a wide AM filter (don't have the filter number in front of me, but can look). I have a Collins speaker to go with it, which is in somewhat lesser shape (no obvious defects, just "dirty"). This is strictly a NO TRADES deal. This is not a distress sale. I don't want to go through the hassle of an E-Bay situation, but I will if I can't get close to going-rate here. I'm in no particular hurry. TIA & 73, Barrie, W7ALW, Missoula, Montana ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] WRL Globe Champion 350
2 things to try- the modulator tubes may be out of phase or just a soft HV supply. Try reversing the cap leads on the plates of the mod. tubes If you have a way of checking HV measure it under load, you may need some bigger caps in HV section. Russ. From: Dino Darling <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] WRL Globe Champion 350 Date: Tue, 25 Feb 2003 13:51:15 -0800 Yep, it sounds like the Globe is broken! You need to sell it to me ASAP! :-) At 11:59 AM 02/25/2003 -0600, you wrote: Hello to you all, I'm a new list member and am delighted to find such a resource. I've been a ham for a bit over 30 years, but almost never operated AM until recently. However, my Dad, W5JHJ, has been a ham since, well, I'm not sure. Probably 62 or 63 years (he'll be 81 this September). He has had some health problems recently and, at 80 years old, is no Spring Chicken anymore. Anyway, he has some pretty neat old gear that he's maintained, which I used when I started out 30 years ago: a WRL Globe Champion 350 transmitter, a Hammarlund HQ-170 receiver, and a Hammarlund HQ-110 general coverage receiver. All of these he's had since new (the transmitter kit was purchased in March, 1959). He also has a mint condition FT-102 in superb condition. He's always maintained all of the gear in good working order and when I was very young (before kindergarten) was quite active. But, with family, the decline of AM in favor of SSB, and increasing job responsibilities, his activity waned. Recently, he's become interested in operating a bit. So, last Saturday, we fired everything up. Aside from dirty switch contacts, we got it all working fine. We even made a QSO with WA5UEK, in Plano, TX, early Saturday evening. However, as we tuned up the Globe, we noticed that the plate current swings down under modulation. Adjusting modulation gain doesn't seem to remove this tendency, though it is lessened until, of course, there is no modulation. I also notice very slight negative deflection of output power, too. Dad doesn't recall whether this was characteristic of the rig, and no mention is made in the manual. Our signal report was fine, though we were only a couple of S-units above the noise, so poor audio might not be noticed. I want to understand why we're seeing the negative deflections under modulation. I'd expect positive deflections, not negative ones. What is this telling me about the transmitter's operation? 73, Kim Elmore, N5OP Kim Elmore, Ph.D. University of Oklahoma Cooperative Institute for Mesoscale Meteorological Studies "All of weather is divided into three parts: Yes, No, and Maybe. The greatest of these is Maybe" The original Latin appears to be garbled. ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio [EMAIL PROTECTED] ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] DRIVER XFMR UPDATE
My Heathkit cap checker has power factor % reading- anything much over 10 % and i scrap it.Russ. From: "Donald Chester" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] DRIVER XFMR UPDATE Date: Sat, 22 Feb 2003 17:41:26 + > If it's impossible to find 125 mfd's (which I doubt...they can > be found I see loads of recently manufactured electrolytics both used and unused, about 125 mfd @ 450 volts, at hamfests. Many of these are packaged as "computer grade". They usually measure above the rated capacitance. I always test for leakage before using them. The simplest test is to put them across a HV supply at near their maximum working voltage and charge them up. Disconnect them and let them sit for a few minutes. A good cap will retain the charge (I have found that out the hard way, by getting a jolt from charged electrolytics that have been lying around for a week or more). The next test, if the cap appears to hold charge, is to put it back across the high voltage, fully charge it, then read the leakage current by placing a milliammeter or microammeter in series with it. Be careful; if the capacitor shorts you can ruin an expensive meter that way. Make sure the cap is fully charged before placing the meter in series, as the charging current can ruin a sensitive meter movement. Since the internal resistance of even a marginally good electrolytic is likely to be several megohms, it wouldn't hurt to place a current limiting resistor in series with the meter - just calculate, using ohm's law, the resistance needed to make the meter read approximately full scale at the power supply voltage. This resistance will be much lower than any leakage resistance (unless you are using a fractional microammeter), and will have little effect on your leakage resistance reading. Don K4KYV _ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
Re: [AMRadio] BA Literature For Sale
Hey Don, is that Radiotron designers handbook still available? If yes, put my name on it. Russ. From: "Merz Donald S" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "baswaplist" <[EMAIL PROTECTED]>,, <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,"Old Tube Radios" <[EMAIL PROTECTED]> Subject: [AMRadio] BA Literature For Sale Date: Thu, 20 Feb 2003 13:18:54 -0500 For Sale (PPD means "includes media mail postage") Davidoff, Martin, K2UBC: The Satellite Experimenter's Handbook, ARRL, 1990, very good. $10 PPD Military TM 11-666 Antennas and Radio Propagation, 2/53, excellent: $10 PPD Military TM 11-669 Transients & Waveforms, 11/51, excellent: $8 PPD Military TM 11-671 Cathode Ray Tubes & Their Associated Circuits, 9/51, excellent: $10 PPD Military TM 11-690 Theory and Application of Transistors, 1959, excellent: $10 PPD Hicks, Principles and Practice of Radio Servicing, McGraw-Hill, 1943, very good: $11 PPD Hallicrafters HT-7 Instruction sheet copy with schematic, 4 pages: $4 PPD NRI Model 90 AM-FM-TV Signal Generator Operating/Instruction Book, 1958, with schematic and parts list, falling apart at spine: $8 PPD DeMaw, Doug: Solid State Basics For The Radio Amateur, ARRL, 1978, good; $8 PPD Smith, F. Langford, ed. : Radiotron Designer's Handbook, 3rd Ed., RCA Australia, 1945, very good: $20 PPD Lenk, J. D.: Handbook of Practical Solid State Troubleshooting , Prentice-Hall, 1971, very good: $8 PPD Feldman, Leonard, FM From Antenna To Audio, 1st ed., Sams, 1973: $4 PPD Mims, Forest: Engineers Mini-Notebook on Communications Projects, Radio Shack, 1987: $4 PPD Martin, T. C.: Nikola Tesla, Inventions, Research & Writings, 1952 Reprint of 1894 original, excellent hardback: $27 PPD NRI Training Booklets, Group of 6: $6 PPD for all B208, Superheterodyne receivers B310, How To Use Your test Equipment B311, How To Use Schematic Diagrams 45BB, How To Eliminate Man_made Interference 14BBX, Radio Receiver Troubles, Their Causes And Remedy 27BBX, The Use Of Arithmetic In Radio & TV Thanks for looking. 73, Don Merz, N3RHT --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html --- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
RE: [AMRadio] DRIVER XFMR UPDATE
try antique electronic supply for 100uf caps work just fine in this rig Russ From: "MIke Wells" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] DRIVER XFMR UPDATE Date: Fri, 21 Feb 2003 16:36:38 -0700 I have changed the bias supply caps but didn't mess with the LV multisection cap in the can and didn't have any replacements for the high voltage caps. The cathode bypass caps are easy to find so I always start with them. I am at some what of a loss as to where a person can find replacements for caps in the 300 working voltages and on up? Is there a big supply out there? Particularly like the 150mfd 450wv high voltage caps, I don't know where to find them so I may pick some stuff up at a swap meet but they are probably as bad as what is in the rig. Where is the best source? Mike -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of russ dworakowski Sent: Friday, February 21, 2003 11:51 AM To: amradio@mailman.qth.net Subject: RE: [AMRadio] DRIVER XFMR UPDATE Mike there are other caps that need replaced as well. remember this is 50 years old. Cathode bypass caps in the speech amp, also electrolytics in the bias supply and LV and HV supplies are all culprits down the road.Change these as a matter of preventive maint. Russ. >From: "MIke Wells" <[EMAIL PROTECTED]> >Reply-To: amradio@mailman.qth.net >To: >Subject: RE: [AMRadio] DRIVER XFMR UPDATE >Date: Thu, 20 Feb 2003 16:38:59 -0700 > >Hello guys, >Just thought I would again say thanks to those that helped with comments on >replacing the driver transformer in my DX-100. Bob, W4WSZ sent me out the >exact replacement and I now have it in the unit and playing. > >A couple interesting things I found was the new 5V4 low voltage rectifier >tube was bad, must of seen too much current. After replacing the 5V4 and >testing the circuit I saw the 12BY7 was shorted and looked more like a >light >bulb than a tube. I went looking and found the 680 ohm cathod resistor was >burned open. Now I wonder if the resistor failed first, taking the 12BY7 >then smoking the driver xfmr causing the 5V4 to die. Or maybe it all >happened when the xfmr went up in smoke. It is back on the air and Chuck, >WA0ZHH and Lonnie W0GPZ said it sounded good. > >73 >Mike >W0FD > > > > >___ >AMRadio mailing list >AMRadio@mailman.qth.net >http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] DRIVER XFMR UPDATE
Connect the grounds to the chassis and leave the shield off- not needed- Russ From: [EMAIL PROTECTED] Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] DRIVER XFMR UPDATE Date: Fri, 21 Feb 2003 11:55:11 -0500 Mike- First I smelled that old familiar allen-bradley smell! Then I noticed the plate of the mic amp tube glowing red... They are a bit hard to get at. I had to remove the shield. -Tony ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
RE: [AMRadio] DRIVER XFMR UPDATE
Mike there are other caps that need replaced as well. remember this is 50 years old. Cathode bypass caps in the speech amp, also electrolytics in the bias supply and LV and HV supplies are all culprits down the road.Change these as a matter of preventive maint. Russ. From: "MIke Wells" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] DRIVER XFMR UPDATE Date: Thu, 20 Feb 2003 16:38:59 -0700 Hello guys, Just thought I would again say thanks to those that helped with comments on replacing the driver transformer in my DX-100. Bob, W4WSZ sent me out the exact replacement and I now have it in the unit and playing. A couple interesting things I found was the new 5V4 low voltage rectifier tube was bad, must of seen too much current. After replacing the 5V4 and testing the circuit I saw the 12BY7 was shorted and looked more like a light bulb than a tube. I went looking and found the 680 ohm cathod resistor was burned open. Now I wonder if the resistor failed first, taking the 12BY7 then smoking the driver xfmr causing the 5V4 to die. Or maybe it all happened when the xfmr went up in smoke. It is back on the air and Chuck, WA0ZHH and Lonnie W0GPZ said it sounded good. 73 Mike W0FD ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
RE: [AMRadio] WANTED: HT-41 & Murch Parts, Info
Hey Don, I am thinking about coming out to the Wash-fest. Not totally committed yet, but will definitely let you know if I am coming. This way, you can bring the DX-100.Russ. From: "Merz Donald S" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] WANTED: HT-41 & Murch Parts, Info Date: Tue, 18 Feb 2003 13:38:24 -0500 Thanks for your note. I am definitely looking at a replacement. This one has missing parts--like the front bezel! 73, Don Merz, N3RHT -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, February 13, 2003 9:48 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] WANTED: HT-41 & Murch Parts, Info Don - I recently had great success retrofitting my Murch 2000A tuner with a right-angle drive and a Veeder-Root turns counter. The existing rectangular dial window was exactly the right size to frame the digital readout... looks great! I understand the original turns counter was pretty cheesy so this might be a good option for you. Steve WD8DAS [EMAIL PROTECTED] --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html --- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus
Re: [AMRadio] Re: 500 Transformer
I have an old stove in the basement- used to be used for canning etc. the oven is never used for cooking food here, so- perfect for baking transformers and paint hi. Russ. From: "Eddy Swynar" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: Re: [AMRadio] Re: 500 Transformer Date: Wed, 12 Feb 2003 21:31:23 -0500 Jeff, Baking transformers behind the XYL's back is a CINCH---the REAL challenge comes when you're trying to bake on an enamel finish paint job on some enclosure that you sprayed earlier...! Even I must admit to doing such things REALLY early in the morning (when she's asleep), or when she's out on some errand! ~73~ Eddy VE3CUI - VE3XZ - Original Message - From: "Jeffrey J. May" <[EMAIL PROTECTED]> To: Sent: Wednesday, February 12, 2003 7:17 PM Subject: Re: [AMRadio] Re: 500 Transformer > Hi John! > You mean that your wonderful xyl lets you use her oven! 68F here > today!..73..Jeff..W0XV > - Original Message - > From: "John Leer" <[EMAIL PROTECTED]> > To: > Sent: Wednesday, February 12, 2003 6:24 PM > Subject: Re: [AMRadio] Re: 500 Transformer > > > > Regarding drying transformers etc. I have been drying transformers and > > chokes for quite a few years. I have used both electric and gas ovens > > with no apparent difference in results. I store my spare transformers in > > an unheated outbuilding and temperatures here in Wisconsin run from -20F > > to +100 so condensation can be a problem in many different devices. I > > first check the resistance from winding to core with a small hand held > > megger which applies about 1000 volts. I find many transformers and > > chokes will have an indication of leakage to ground after a year or so > > in storage. After baking for 4 hours or so at 200+ degrees and allowing > > to cool, the megger will indicate infinite resistance winding to core. I > > have found a something strange, to wit, if the measurement is taken soon > > after removal from the oven , the megger will still indicate a leakage > > resistance. Upon cooling the resistance will usually be infinite. The > > transformers with tar type potting seem to be the worst offenders at > > absorbing moisture. I assume this is due to cracking of the tar. John > > K9XH > > > > Donald Chester wrote: > > > > > > Be careful about using a gas-fired oven to dry out the transformers. > Water > > > is a by-product of gas combustion, and the air will carry plenty of > water > > > vapour. Better to use an electric stove oven. > > > > > > If you are in no hurry, bring the transformer into a dry, heated room > and > > > store it there over the winter season. By the time you start cutting > off > > > the heat in the spring, the transformer should be well dried out. It is > > > more effective to let the moisture gradually evaporate from the guts of > the > > > transformer, just as it gradually condensed there when the transformer > was > > > in a moist environment, and there will be less likelihood of abnormally > hot > > > temperature causing deterioration of the insulation. > > > > > > Don K4KYV > > > > > > _ > > > Add photos to your messages with MSN 8. Get 2 months FREE*. > > > http://join.msn.com/?page=features/featuredemail > > > > > > ___ > > > AMRadio mailing list > > > AMRadio@mailman.qth.net > > > http://mailman.qth.net/mailman/listinfo/amradio > > > > ___ > > AMRadio mailing list > > AMRadio@mailman.qth.net > > http://mailman.qth.net/mailman/listinfo/amradio > > > > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] Re: 500 Transformer
It is not really unusual for these transformers to go bad. You must consider the age and how they were manufactured. You can blame Johnson for using cheaper transformers, they could have used potted designs. But who would have thought that you would be using this old stuff? Old transformers do bad things- they suck up moisture in the air and the windings viberate and break down the insulation. I don't think you will find anything seriously wrong with your amp.Heres an experiment: got an old unsealed transformer in the basement that has not been run in a few years? Put it in the oven@ 200 degrees. Just leave it in for a few minutes. Open the oven door and you are likely to see it steaming! Thats water.Russ. From: Dave Aabye <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: [AMRadio] Re: 500 Transformer Date: Mon, 10 Feb 2003 14:20:22 -0500 Hi Gary, Yep, it's a bummer! WZ1M wants $260 to rewind the existing transformer. Peter Dahl sells a replacement for $285. I think that Dahl offers a better deal because it is a hypersil unit with a 500 ma CCS rating. I believe the original is rated 400 ma ICAS. Only drawback is the need for 4 new mounting holes. I replaced the tube recitifiers with solid state units shortly after purchasing the 500 (about two years ago). I also inserted thyristers in the primary leads to cut down on inrush current. I wonder if you have any further protective measures to suggest. 73 de Dave, W4QCU Oak Ridge, TN Gary Blau wrote: > Dave: > > Ouch. Sorry to hear that. > Sounds like WZ1M's offer to rewind might be attractive, unless you can > find another 500 xfmr somewhere (good luck!). That's a great rig so > it's worth the investment. > > Now, to find out why it went bad in the first place... > Best of luck. > > Gary > W3AM > > Dave Aabye wrote: > > > > Hello Gary, > > > > Thanks for the suggestion, which I believe has proven to be conclusive. > > > > I hooked my Variac to the primary and slowly increased the secondary voltage. > > The caps were disconnect from the rectifiers, so the transformer was "all by > > itself". At about 700 volts, the voltage started to jump just a bit. At > > maybe 750 v, the secondary emitted a puff of smoke with an accompanying hiss. > > > > I think it is clear that the transformer is shot. Time to call Peter Dahl! > > > > Again, thanks for your input. > > > > 73 de Dave > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] re: 4-1000 or 813 AM transmitter information needed
Ron, do you know VE4BX in Hamiota Manitoba? He runs 4-1000s in a HB set up. From: "Ron Samchuk" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: [AMRadio] re: 4-1000 or 813 AM transmitter information needed Date: Fri, 7 Feb 2003 00:03:13 -0600 Hi everyone. I need information on building a good AM kilowatt rig using either two 4-1000A tubes or two 813's as finals. I have several parts (including those tubes), but I need some advise, plans, schematics, etc. on such a project. I am considering using 813's or 810's as modulators. Links to a good website would help. Thanks in advance for your assistance. from Ron VE4SR --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html --- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
Re: [AMRadio] Need some assistance on a B&W 5100 !
It is possible you do in fact have bristol head or spline head set screws as BW was a military contractor. The R390s have these also. Russ. From: [EMAIL PROTECTED] Reply-To: amradio@mailman.qth.net To: [EMAIL PROTECTED], [EMAIL PROTECTED],Amradio@mailman.qth.net, [EMAIL PROTECTED] Subject: [AMRadio] Need some assistance on a B&W 5100 ! Date: Fri, 7 Feb 2003 17:02:30 EST Can anyone help me? I have a B&W 5100 I need to take a part but, the knobs do not seem to be Allen screws. The last thing I want to do is damage the fasteners. Are they Bristol or maybe U.S. standard screws or I'm mistaken and they are Allen fasteners? Jim W2RXR --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html --- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
Re: [AMRadio] Driver Xfmr
Yes, Antique Electronic Supply in Az. From: "MIke Wells" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "AM Radio List" Subject: [AMRadio] Driver Xfmr Date: Thu, 6 Feb 2003 13:17:35 -0700 Hello, I just lost the audio driver xfmr in my DX-100. I turned it on to warm up and a few minutes later the house filled with the familiar smell. Anyone have a parts unit or advise as where I might find a replacement? Thanks Mike W0FD ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] Variac hook up
Steve, using a ohmmeter, Find out which terminal is the wiper arm- this is the hot side of the output. The cold side of the output is also the neutral terminal. The other side of the winding is the hot side of the line.Again hook up the line side to each end of the windings, the neutral side is common to input and output. The output terminals are the wiper and neutral. Russ. From: "Steve Fitzgerald" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: [AMRadio] Variac hook up Date: Tue, 4 Feb 2003 17:55:00 -0500 Hello, I bought a 20 amp 110 volt variac from an estate this past weekend. I would like to know what is the correct way to hook up the beast. It is made by American Transformer Co. and the catalog number is 27666. It has four terminals marked 1,2,3 and 4. Can I assume that 1 and 2 are input and 3,4 are output? Thank you, Steve Fitzgerald N4KQR Tampa FL ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
RE: [AMRadio] on CAIG Products WAS cleaning tube sockets and pins
Just a word of warning about the Caig contact spray- be real careful not to get any on osc. coils- it will detune them. Russ. From: "Merz Donald S" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] on CAIG Products WAS cleaning tube sockets and pins Date: Mon, 27 Jan 2003 10:21:45 -0500 Actually, CAIG offers a sample kit of their most used products for about $15. The products come in small tubes. I learned a lot by working with the samples. I am completely sold on their MCL oil and MCL grease--both conductive lubricants that work great. I think everyone should try out the sample kit for themselves and see which products fit the kind of jobs that they run into most often. 73, Don Merz, N3RHT -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Sunday, January 26, 2003 8:40 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] on cleaning tube sockets and pins Quoting russ dworakowski <[EMAIL PROTECTED]>: > Hey Mark, do you have that Caig Deoxit stuff? Its about the best > stuff I have ever seen like this. Russ It's a miracle worker. Don't forget the companion in the blue can PreservIt from Caig! Powell W4OPW - This mail sent through IMP: http://horde.org/imp/ ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] on cleaning tube sockets and pins
Hey Mark, do you have that Caig Deoxit stuff? Its about the best stuff I have ever seen like this. Russ From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "amradio@mailman.qth.net" ,[EMAIL PROTECTED] Subject: [AMRadio] on cleaning tube sockets and pins Date: Sun, 26 Jan 2003 13:34:58 -0800 (PST) I am ressurecting a Viking Invader 2000. It is coming back to life reasonably well. Almost ready to pop in the 4-400's and burn the house down. I had to replace a rectifier and a couple of electrolytics in the exciter supply. The balance of the orignal electrolytics all formed such that each draws no more than 2 MA @ 450 DC. Not bad for 40 year old firecrackers! Some crud managed to get in the threads of a couple of the padders in the driver tank. I have cleaned the threads of the trimmers and have good output in the various modes. Sure is a lot easier than adjusting a phasing rig! Dirt or oxidation had gotten into a couple of tube sockets and this made the output unstable. Eventually, alignment of the various stages yielded good results - I just had to periodically wiggle a mixer tube. Thus, the most trouble I am having is related to intermittant connections on the various 7 & 9 pin tubes. Any body have any "sure fire" tricks on cleaning tube sockets and pins of minature tubes? TNX de KA4JVY Mark __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] DX-100 vfo
Yes OK Jim, thanks for your input. In addition to the VFO problem, I see now that there is no grid drive on 160 or 80. So maybe a good idea to fix that first. The VFO seems to be a weak point in the DX-100, but other areas are easy to fix- audio etc. This DX-100 was a parts rig, and I found all the parts to put it back together. Working on 40 meters just fine- except for the reverse tracking on the VFO. Should have tested it before remounting it in the rig. Trying to get around removing it again.The potted iron in a DX-100 make it a great project- well worth the effort. From: "Tommye & Jim Wilhite" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: Re: [AMRadio] DX-100 vfo Date: Thu, 9 Jan 2003 13:01:16 -0700 Russ: Your story sounds like the problems I had with my DX 100. Low to no grid drive I traced to the socket for the 12BY7 and after replacing it the thing took off like nobody's business (there were some other minor components weak as well). I changed the coupling caps in the audio circuit, increased the decoupling caps and put in a little negative feedback. I get better reports than before the mods. Don't know why I have a soft spot for the DX 100 but it is really a good radio. Have fun with yours. 73 Jim de W5JO - Original Message - From: "russ dworakowski" <[EMAIL PROTECTED]> To: Sent: Thursday, January 09, 2003 10:57 AM Subject: RE: [AMRadio] DX-100 vfo > Yes George, its a jugsaw puzzle, this is a complete basket case > rebuild, been a lot of fun though. Just a few more pieces to figure out- > hi. I have it on the air- getting great audio rpts! Just minor audio > mods. Russ. > > > > > ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8: advanced junk mail protection and 2 months FREE*. http://join.msn.com/?page=features/junkmail
RE: [AMRadio] DX-100 vfo
Yes George, its a jugsaw puzzle, this is a complete basket case rebuild, been a lot of fun though. Just a few more pieces to figure out- hi. I have it on the air- getting great audio rpts! Just minor audio mods. Russ. From: "George Pritchard" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] DX-100 vfo Date: Thu, 9 Jan 2003 09:49:41 -0500 I realized my misinterpretation of your VFO problem, with the "skewed" dial indication, after I read the replies. Funny, the dial must have been that way from day one. Have fun, George KC -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of russ dworakowski Sent: Wednesday, January 08, 2003 11:48 PM To: amradio@mailman.qth.net Subject: RE: [AMRadio] DX-100 vfo Thanks for your input Geprge, but you don't get it- the VFO tracks "tunes" reverse- it is not drifting. I think I have the dial out 180 degrees. Russ >From: "George Pritchard" <[EMAIL PROTECTED]> >Reply-To: amradio@mailman.qth.net >To: >Subject: RE: [AMRadio] DX-100 vfo >Date: Tue, 7 Jan 2003 15:25:40 -0500 > >DX100 VFO Troubles: >Drifting up during transmission: Line voltage drop during plate voltage >turn >on with 600 watts pulled from the outlet may the problem. Check by first >using the spot switch listening to the beat freq on the receiver. Then, >turn >on the plate voltage with transmitter fully loaded, and monitor the drift. >If the filaments in the oscillator drops in voltage and slightly cools off >the tube, the oscillator will drift! See if the oscillator returns to the >original frequency when the plate switch is turned off. Cure: Use a variac >to keep the voltage at >115 VAC during transmit. Or create a DC regulated >supply for the filament string. Anything much lower than 115VAC and the >emissions on the 12BY7 / 5763 and 6146s drops also. You may see this as >gradual drop-off of grid drive during transmit... especially on TEN meters. >I also rewired my VFO with heavy #14 copper. This was mechanically >superior >to the flimsy wiring that can cause drift and microphonics. Here is the big >stability problem: Jumping during VFO freq adjustment on TEM meters. The >VFO >main variable has a rear ball bearing to support the cap shaft. It oxidizes >and becomes erratic. I tried to clean it, but it was never perfect and >always degraded again. I finally REMOVED THE DAM BEARING THING and the >problem was solved. The bearing is not needed as I initially thought. The >shaft is very stable without it. I hope some of this helps. >George AB2KC > >-Original Message- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] Behalf Of russ dworakowski >Sent: Tuesday, January 07, 2003 1:53 PM >To: amradio@mailman.qth.net >Subject: Re: [AMRadio] DX-100 vfo > > >To the group: I am having difficulty witha different VFO- a VF-1 >or same as used in a DX-100. I know you guys are talking CE20- just a >question- my VFO is tracking reverse in frequency- like when you go down >in frequency on the display, it is actually going up in frequency. >Is it possible that the end point adjustments are so far off that they >could cause this? Russ > > > > > > > >From: Gary Schafer <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: amradio@mailman.qth.net > >Subject: Re: [AMRadio] "Reply" button got me... > >Date: Sun, 05 Jan 2003 14:46:35 -0500 > > > >Hi Larry and others, > > > >I too have a 20A. Have had several over the years. I found that to get >good > >output on 40 meters that the 1625 has to be in very good shape. Being >just > >a > >little weak makes a big difference. > > > >Also you need to adjust the padding coil (miniductor stock) that is >across > >the > >1625 tank coil in the vfo. You adjust it by spreading the turns on one >end. > >If I > >remember right, the padding capacitor under the chassis needs to be >peaked > >on 80 > >or 20 meters. The other bands are adjusted by adjusting the miniductor > >coils for > >maximum output. (It doubles or triples for other bands) It takes some > >messing > >with to get them right as the Q is pretty high. When you replace the top > >cover on > >the vfo things change so you have to compensate for that when adjusting. > >I watched the output of the transmitter (at less than full power) on a > >meter > >while adjusting the coils. Then watching how much it changes with the > >cover, you > >can get a feel for how much you need to adjust it in the opposite >direction > >so it > >will be right with the cover on. Adju
RE: [AMRadio] DX-100 vfo
Thanks for your input Geprge, but you don't get it- the VFO tracks "tunes" reverse- it is not drifting. I think I have the dial out 180 degrees. Russ From: "George Pritchard" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] DX-100 vfo Date: Tue, 7 Jan 2003 15:25:40 -0500 DX100 VFO Troubles: Drifting up during transmission: Line voltage drop during plate voltage turn on with 600 watts pulled from the outlet may the problem. Check by first using the spot switch listening to the beat freq on the receiver. Then, turn on the plate voltage with transmitter fully loaded, and monitor the drift. If the filaments in the oscillator drops in voltage and slightly cools off the tube, the oscillator will drift! See if the oscillator returns to the original frequency when the plate switch is turned off. Cure: Use a variac to keep the voltage at >115 VAC during transmit. Or create a DC regulated supply for the filament string. Anything much lower than 115VAC and the emissions on the 12BY7 / 5763 and 6146s drops also. You may see this as gradual drop-off of grid drive during transmit... especially on TEN meters. I also rewired my VFO with heavy #14 copper. This was mechanically superior to the flimsy wiring that can cause drift and microphonics. Here is the big stability problem: Jumping during VFO freq adjustment on TEM meters. The VFO main variable has a rear ball bearing to support the cap shaft. It oxidizes and becomes erratic. I tried to clean it, but it was never perfect and always degraded again. I finally REMOVED THE DAM BEARING THING and the problem was solved. The bearing is not needed as I initially thought. The shaft is very stable without it. I hope some of this helps. George AB2KC -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of russ dworakowski Sent: Tuesday, January 07, 2003 1:53 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] DX-100 vfo To the group: I am having difficulty witha different VFO- a VF-1 or same as used in a DX-100. I know you guys are talking CE20- just a question- my VFO is tracking reverse in frequency- like when you go down in frequency on the display, it is actually going up in frequency. Is it possible that the end point adjustments are so far off that they could cause this? Russ >From: Gary Schafer <[EMAIL PROTECTED]> >Reply-To: amradio@mailman.qth.net >To: amradio@mailman.qth.net >Subject: Re: [AMRadio] "Reply" button got me... >Date: Sun, 05 Jan 2003 14:46:35 -0500 > >Hi Larry and others, > >I too have a 20A. Have had several over the years. I found that to get good >output on 40 meters that the 1625 has to be in very good shape. Being just >a >little weak makes a big difference. > >Also you need to adjust the padding coil (miniductor stock) that is across >the >1625 tank coil in the vfo. You adjust it by spreading the turns on one end. >If I >remember right, the padding capacitor under the chassis needs to be peaked >on 80 >or 20 meters. The other bands are adjusted by adjusting the miniductor >coils for >maximum output. (It doubles or triples for other bands) It takes some >messing >with to get them right as the Q is pretty high. When you replace the top >cover on >the vfo things change so you have to compensate for that when adjusting. >I watched the output of the transmitter (at less than full power) on a >meter >while adjusting the coils. Then watching how much it changes with the >cover, you >can get a feel for how much you need to adjust it in the opposite direction >so it >will be right with the cover on. Adjusting the coupling loop (knob on front >panel) will detune the tank a little too on 40 meters. > >On one vfo that I have I tried slug tuned coils in place of the miniductor >stock >to see if they could be substituted. I found that the slug tuned coils in >place >of the miniductors did not give near as much output on the vfo so that was >abandoned . > >I also tried to use a higher harmonic for 10 meters and shift the vfo with >an >additional padder capacitor (similar to what is done for 15 meters). I had >a >spectrum analyzer to watch all the harmonics at once but found that I could >not >get enough isolation. Some of the lower harmonics would end up in the >output. I >got it to work but tuning was very tricky and if not looking at the >spectrum >analyzer, the wrong harmonics would get right through the 20A. I gave up on >that >idea. > >I do have a vfo with the 10 meter kit in it. The crystal oscillator in it >is run >directly from the 20A's high voltage. When keying the transmitter that >voltage >drops some and the crystal oscillator starts to drift. I think that I tried >running i
Re: [AMRadio] DX-100 vfo
To the group: I am having difficulty witha different VFO- a VF-1 or same as used in a DX-100. I know you guys are talking CE20- just a question- my VFO is tracking reverse in frequency- like when you go down in frequency on the display, it is actually going up in frequency. Is it possible that the end point adjustments are so far off that they could cause this? Russ From: Gary Schafer <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] "Reply" button got me... Date: Sun, 05 Jan 2003 14:46:35 -0500 Hi Larry and others, I too have a 20A. Have had several over the years. I found that to get good output on 40 meters that the 1625 has to be in very good shape. Being just a little weak makes a big difference. Also you need to adjust the padding coil (miniductor stock) that is across the 1625 tank coil in the vfo. You adjust it by spreading the turns on one end. If I remember right, the padding capacitor under the chassis needs to be peaked on 80 or 20 meters. The other bands are adjusted by adjusting the miniductor coils for maximum output. (It doubles or triples for other bands) It takes some messing with to get them right as the Q is pretty high. When you replace the top cover on the vfo things change so you have to compensate for that when adjusting. I watched the output of the transmitter (at less than full power) on a meter while adjusting the coils. Then watching how much it changes with the cover, you can get a feel for how much you need to adjust it in the opposite direction so it will be right with the cover on. Adjusting the coupling loop (knob on front panel) will detune the tank a little too on 40 meters. On one vfo that I have I tried slug tuned coils in place of the miniductor stock to see if they could be substituted. I found that the slug tuned coils in place of the miniductors did not give near as much output on the vfo so that was abandoned . I also tried to use a higher harmonic for 10 meters and shift the vfo with an additional padder capacitor (similar to what is done for 15 meters). I had a spectrum analyzer to watch all the harmonics at once but found that I could not get enough isolation. Some of the lower harmonics would end up in the output. I got it to work but tuning was very tricky and if not looking at the spectrum analyzer, the wrong harmonics would get right through the 20A. I gave up on that idea. I do have a vfo with the 10 meter kit in it. The crystal oscillator in it is run directly from the 20A's high voltage. When keying the transmitter that voltage drops some and the crystal oscillator starts to drift. I think that I tried running it from the regulated 105 volts one time but that dropped the output too low. I have never gotten back to it to try and solve the drift problem. Other than that it works pretty well on 10. I also have a Phase master vfo that I have yet to hook up. It is built on the 458 parts but rather than use harmonics they have separate crystals and heterodyne for the other bands. It may double on one band, I can't remember. The schematic of it is in Stoners SSB handbook. 73 Gary K4FMX Larry Szendrei wrote: > Mike et. al., > > My CE20A has about 1/2 the output on 40M as it has on the other bands > (160, 80, 20, & 15) in spite of the fact that the CE mods to cure this > in the VFO-458 have been implemented. As I recall the VFO output is > tripled for 40M, and only doubled or on the fundamental for the other > bands. My VFO doesn't have 10M capability, so have no experience with > 10M on this rig. > > 73, > -Larry/NE1S > > MIke Wells wrote: > > > > I'm enjoying the 20A discussion. I have a 20A that I want to get on the air > > so keep the messages posted here for the benefit of others. > > > > Tell me more about the VFO, are you having good luck with it on all bands? > > I've only got mine working on the low bands, no oscillation on 40 meters. > > Suggestions? > > > > 73, > > > > Mike W0FD > > > > Subject: [AMRadio] "Reply" button got me... > > > > Regarding the previous posting to the list: it was unintended. The old > > "reply" button got me again! > > > > If you're interested, read it. It's part of a discussion Jim Candela and > > I are having about a vintage SSB exciter, the venerable Central > > Electronics 20A. If not, the "Delete" button is much more predictable in > > its effects than "Reply." :>) > > > > 73, and back to AM... > > > > -Larry/NE1S > > > > ___ > > AMRadio mailing list > > AMRadio@mailman.qth.net > > http://mailman.qth.net/mailman/listinfo/amradio > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___
Re: [AMRadio] WTD Scientific Radio Systems SR-206/210
What do I look like to you - a surplus house? I don't even know what these are. Hi Jim- Merry Christmas- Russ. From: "James M. Walker" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "AMRadio (list)" Subject: [AMRadio] WTD Scientific Radio Systems SR-206/210 Date: Sun, 22 Dec 2002 09:01:16 -0500 Hello All, and Seasons Greetings. I am looking for the transceiver models SR-206 or SR-210. This is an attempt to acquire the channel board plug ins. I have a need for 20 or so of the boards. Please contact me directly if you have these items. Thanks and be Peaceful Jim WB2FCN http://eshop1.chem.buffalo.edu ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ The new MSN 8: smart spam protection and 3 months FREE*. http://join.msn.com/?page=features/junkmail&xAPID=42&PS=47575&PI=7324&DI=7474&SU= http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_smartspamprotection_3mf
Re: [AMRadio] Crystal Grinding
Tony and the group- Acid etching process was invented by Bliley Electric- here in Erie, They had it down to timing of dipping the quartz wafers in an acid bath. They knew exactly how much material would be etched away, and as a result had crystals of far greater acuracy and produced in record time and quantity. During WWII, the Army paid Blileys a visit, and forced them to reveal their secret process to the other manufacturers. Blileys never got patent rights for their process. I contacted Charles Bliley on the matter, he told me it didnot matter, as they got their share of military contracts. Some other well known publication played up James Knights Co. as the crystal gods- sorry not so. Russ. From: "Brian Carling" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] Crystal Grinding Date: Fri, 13 Dec 2002 14:30:09 -0500 On 12 Dec 2002 at 19:39, [EMAIL PROTECTED] wrote: > Along the same lines, does anyone know about chemical etching of > crystals to shift frequency? I expect it requires some nasty hazmat > stuff to cut the quartz. I saw a reference in an old QST but didn't > have the issue mentioned. > > -Tony, K1KP I don't think chemical etching is recommended. The commercial boys do it with first a grinder to shape the crystal "bar" and then a SAW, to get the slices made aproximately right. Of course the wafers then are actually thicker than they will need to be in the end. The final step is to put them in a lapping machine which rubs them down to the required thickness, and up to the required frequency in a lubricative cutting paste slurry which combines lubricants, cutting compounds and a means to conduct heat away into the lapping machine from the crystals so that they don't break. Of course radio amateurs have been known to use all kinds of unconventional methods and perhaps that could include chemical etching ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail
Re: [AMRadio] Eurpoean AM gear as seen in Dr. "No"
Yes Mark, but did you notice 007 doesn't care about all that cool radio gear, after all, he's got some of the coolest gear anyone could ever want. I really love what they do to those Omega watches he wears.Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "amradio@mailman.qth.net" Subject: [AMRadio] Eurpoean AM gear as seen in Dr. "No" Date: Thu, 5 Dec 2002 19:06:26 -0800 (PST) So, I am siting in front of the computer coding up a project with the TV tuned to TNN running James Bond - Dr. No in the background. I glanced up to see a young lady transmitting on a Geloso (G212) and receiving on an Eddystone 680(?). The scene cut to an official MI6 style signal room wall to wall with Racal RA-17's. Kind of neat. The funny thing about the Geloso is that it uses a pair of 807's in the final. Not a lot of punch for traversing from the West Indies to England. Anybody else seen classic gear in the movies? DE KA4JVY Mark __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets.
Sorry Mark, don't have it. He is near Dave, WB3ETN, near Indiana, PA.Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets. Date: Sun, 1 Dec 2002 21:32:37 -0800 (PST) ?? I thought they can only match house paint ? Russ, forward me N3HFB's email so I can ask him what he did. DE KA4JVY Mark --- russ dworakowski <[EMAIL PROTECTED]> wrote: > Mark, I hear Loews or Home Depot can match up > any color. Just > bring in a panel or chip of paint. Do you > know Tony N3HFB? > He redid a pair of Heath Indian rigs- the > paint came out > beautiful. Should be an easy find. Russ. > > > > > > > >From: Mark Foltarz <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: "amradio@mailman.qth.net" > >,"[EMAIL PROTECTED]" > > ><[EMAIL PROTECTED]> > >Subject: [AMRadio] Need paint "Heathkit green" > paint for Cheyenne Commanche > >cabinets. > >Date: Fri, 29 Nov 2002 12:08:42 -0800 (PST) > > > >Anyone know of a vendor for the old Heathkit green > >paint for Cheyenne & Commanche cabinets? > > > >Thanks! > >73 DE KA4JVY > >Mark > > > > > >__ > >Do you Yahoo!? > >Yahoo! Mail Plus - Powerful. Affordable. Sign up > now. > >http://mailplus.yahoo.com > >___ > >AMRadio mailing list > >AMRadio@mailman.qth.net > >http://mailman.qth.net/mailman/listinfo/amradio > > > _ > Add photos to your e-mail with MSN 8. Get 2 months > FREE*. > http://join.msn.com/?page=features/featuredemail > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
Re: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets.
Sorry don't have N3HFB's email address. Try QRZ.com Russ From: "Geoff Edmonson" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: Re: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets. Date: Mon, 2 Dec 2002 05:06:33 -0600 > ?? I thought they can only match house paint ? > > Russ, forward me N3HFB's email so I can ask him what > he did. wouldn't it be easier just to take a cabinet down there and have the paint color matched? 72 ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
Re: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets.
Mark, I hear Loews or Home Depot can match up any color. Just bring in a panel or chip of paint. Do you know Tony N3HFB? He redid a pair of Heath Indian rigs- the paint came out beautiful. Should be an easy find. Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "amradio@mailman.qth.net" ,"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Subject: [AMRadio] Need paint "Heathkit green" paint for Cheyenne Commanche cabinets. Date: Fri, 29 Nov 2002 12:08:42 -0800 (PST) Anyone know of a vendor for the old Heathkit green paint for Cheyenne & Commanche cabinets? Thanks! 73 DE KA4JVY Mark __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
Hi Pete, no experience here with the BC-610. But I would ask why [other than stock audio] you think a 610 is better than a T368? Yes, the GPT-750 is a winner indeed. No, not just price, but it is a good guideline. The 5100s were only outpriced by the 32V Collins. Well, not sure about the Central Electronics 100V. I just want to make it clear that this is fun discussion, not an arguement as to who is right. This is classic stuff like the old cars. Thety all have their good and bad points. Now, here's an interesting point- which older rig would be easiest to renovate- repair- and get running again properly. I would narrow this down to 2 or 3 rigs- say- DX-100, Viking II, and maybe a Globe?Here we go again! Russ. From: Peter A Markavage <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Tue, 26 Nov 2002 18:21:52 -0500 Russ: Since Caddy's and Lincoln's are pricey and if we're only using price as a gauge, I would probably have to say the KW-1. But price doesn't always make it the best. In my opinion the best all around manufactured AM rig has to be the BC-610 series, followed by the T368. Now if you're talking AM/CW/SSB rigs, the KWS-1 and the TMC GPT-750 are high on my list. Pete On Tue, 26 Nov 2002 11:41:08 -0500 "russ dworakowski" <[EMAIL PROTECTED]> writes: > So Pete, whats equivilant to a Caddy or Lincoln? Russ. > > > > > > > >From: Peter A Markavage <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: amradio@mailman.qth.net > >Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham > transmitter? > >(imho) > >Date: Mon, 25 Nov 2002 12:06:49 -0500 > > > >My Valiant was like a Pinto; all my WRL products were like Yugo's; > my > >Viking II is like a Volvo. > >Pete, WA2CWA > > > >On Mon, 25 Nov 2002 11:28:44 -0500 "russ dworakowski" > ><[EMAIL PROTECTED]> writes: > > > All these old rigs are great fun. They all have some > > > quirks. > > > I like to equate them to old cars- like a Collins is a > Caddy, > > > and A > > > Viking is a Dodge. Heath- like a Ford, B-W, I would > rank > > > about a Buick or Pontiac. Yu get the bugs out of them > and > > > you > > > got a pretty good rig. Russ. > > > > > > Sign Up for Juno Platinum Internet Access Today Only $9.95 per month! Visit www.juno.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
So Pete, whats equivilant to a Caddy or Lincoln? Russ. From: Peter A Markavage <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Mon, 25 Nov 2002 12:06:49 -0500 My Valiant was like a Pinto; all my WRL products were like Yugo's; my Viking II is like a Volvo. Pete, WA2CWA On Mon, 25 Nov 2002 11:28:44 -0500 "russ dworakowski" <[EMAIL PROTECTED]> writes: > All these old rigs are great fun. They all have some > quirks. > I like to equate them to old cars- like a Collins is a Caddy, > and A > Viking is a Dodge. Heath- like a Ford, B-W, I would rank > about a Buick or Pontiac. Yu get the bugs out of them and > you > got a pretty good rig. Russ. > Sign Up for Juno Platinum Internet Access Today Only $9.95 per month! Visit www.juno.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] B&W 5100 Possibilmente la radiotrasmittente dilettante costruita migliore ? (imho)
Yes, Mark, an interesting comparison, Geloso and Fiat are both pretty rare these days huh? Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibilmente la radiotrasmittente dilettante costruita migliore ? (imho) Date: Mon, 25 Nov 2002 09:04:46 -0800 (PST) And a Geloso is like a Fiat? HI Mark --- russ dworakowski <[EMAIL PROTECTED]> wrote: > All these old rigs are great fun. They all > have some quirks. > I like to equate them to old cars- like a > Collins is a Caddy, and A > Viking is a Dodge. Heath- like a Ford, B-W, > I would rank > about a Buick or Pontiac. Yu get the bugs out > of them and you > got a pretty good rig. Russ. > > > > > > > >From: Peter A Markavage <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: amradio@mailman.qth.net > >Subject: Re: [AMRadio] B&W 5100 Possibly the best > built ham transmitter? > >(imho) > >Date: Mon, 25 Nov 2002 01:42:26 -0500 > > > >This Viking II came factory wired and I'm the > second owner. > >Pete > > > >On Sat, 23 Nov 2002 15:30:07 EST [EMAIL PROTECTED] > writes: > > > < Johnson Viking II. Since > > > 1958, it > > > has never required a tube or part replacement. > > > > > > > > > Did you put that together yourself? > > > > > > 73, > > > Sterve W2ZR > > > > > > > > >Sign Up for Juno Platinum Internet Access Today > >Only $9.95 per month! > >Visit www.juno.com > >___ > >AMRadio mailing list > >AMRadio@mailman.qth.net > >http://mailman.qth.net/mailman/listinfo/amradio > > > _ > MSN 8 helps eliminate e-mail viruses. Get 2 months > FREE*. > http://join.msn.com/?page=features/virus > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio __ Do you Yahoo!? Yahoo! Mail Plus Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
You're just getting personal about it Larry. They are all BAs and most are fixable. My fixed up Viking II was really beat up and reminded me of an old Dodge. Certainly can't fault Dodge for lack of iron, I can Johnson though. Rust? well, Globe seems to be the worst, but Johnson is not far behind- when metal prep was considered. Have fun with this folks. Russ. From: Larry Szendrei <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Mon, 25 Nov 2002 11:28:54 -0800 Russ, Why would you call a Viking a Dodge? Personally, I think they're much better than that ;>) 73, -Lary/NE1S russ dworakowski wrote: > > All these old rigs are great fun. They all have some quirks. > I like to equate them to old cars- like a Collins is a Caddy, and A > Viking is a Dodge. Heath- like a Ford, B-W, I would rank > about a Buick or Pontiac. Yu get the bugs out of them and you > got a pretty good rig. Russ. > > >From: Peter A Markavage <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: amradio@mailman.qth.net > >Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? > >(imho) > >Date: Mon, 25 Nov 2002 01:42:26 -0500 > > > >This Viking II came factory wired and I'm the second owner. > >Pete > > > >On Sat, 23 Nov 2002 15:30:07 EST [EMAIL PROTECTED] writes: > > > < > > 1958, it > > > has never required a tube or part replacement. > > > > > > > > > Did you put that together yourself? > > > > > > 73, > > > Sterve W2ZR > > > > > > > > >Sign Up for Juno Platinum Internet Access Today > >Only $9.95 per month! > >Visit www.juno.com > >___ > >AMRadio mailing list > >AMRadio@mailman.qth.net > >http://mailman.qth.net/mailman/listinfo/amradio > > _ > MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. > http://join.msn.com/?page=features/virus > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio - Introducing NetZero Long Distance 1st month Free! Sign up today at: www.netzerolongdistance.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
All these old rigs are great fun. They all have some quirks. I like to equate them to old cars- like a Collins is a Caddy, and A Viking is a Dodge. Heath- like a Ford, B-W, I would rank about a Buick or Pontiac. Yu get the bugs out of them and you got a pretty good rig. Russ. From: Peter A Markavage <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Mon, 25 Nov 2002 01:42:26 -0500 This Viking II came factory wired and I'm the second owner. Pete On Sat, 23 Nov 2002 15:30:07 EST [EMAIL PROTECTED] writes: > < 1958, it > has never required a tube or part replacement. > > > Did you put that together yourself? > > 73, > Sterve W2ZR > Sign Up for Juno Platinum Internet Access Today Only $9.95 per month! Visit www.juno.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
Hello Pete, must comment on all, as I have most of these. I do not have a Central Electronic 100V, a friend however, refurbished one, it was a basket case, he said it was a SOB to fix, but he eventually got it, he said it it a great rig. Always a preasure to get a tuff fixer working. I had a similar problem with a 5100. Took a while to figure out but, worth the trouble. Viking II- great radio- easy to work on. Apache- real good, needs rework in speech amp, then great rig- love the comments on mine. " thats no scratchy apache". DX-100- real good- minor audio fixes. 100B is better with continuous loading. I have not been in Valliants, but like the Apache, needs audio help. 73s Russ. From: Peter A Markavage <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Sat, 23 Nov 2002 14:51:20 -0500 B&W 5100B was a much better transmitter when it was introduced into the market. B&W took all the 5100 fixes, corrections, updates, etc. and made a much better and more reliable transmitter. Although I have a 5100B, I rarely use it. Much prefer the Central Electronics 100V or my Heath Apache for over all performance, ease of use, easily repairable, functionality, and cosmetics. The most reliable rig in my shack is the Johnson Viking II. Since 1958, it has never required a tube or part replacement. Pete. WA2CWA On Sat, 23 Nov 2002 10:47:09 -0800 (PST) Mark Foltarz <[EMAIL PROTECTED]> writes: > I just finished cleaning up the B&W 5100 I picked up > at the Butler meet last Summer. > > I don't know what prompted me to buy it , but now I am > sure glad I did. Maybe it was all the great food ( > including Russ's fabulous baked beans of mass > destruction HI!) > > What strikes me the most about this radio is how well > it is designed and constructed. My only complaint > about the design is that the mode switch intereferes > with access to one of the audio input shield screws - > boo hoo. > > Other than that, this is by far the best built radio I > own in terms of construction, ease of servicing and > overall engineering. Better than my Collins, > Halicrafters, WRL, Drake, Eldico etc. The only thing > that comes close is my TMC gear or the T-368 - but > these were obviously not for the amateur market. > > Modular construction allowed for easy replacement of a > few parts in the modulator. I essentially replaced > several .001 with some .02 and two out of spec > resistors. > > The use of an oil filled cap in the filter was a nice > change. Typically one has to take a small loan for > direct replacements or cobble up a string of > electrolytics with eq. resistors. In fact I only had > to replace three electrolytics - the double 20 @ 450v > and a 20 @150v. > > A wire brush was very useful cleaning up the milled > edges on the knobs. > > I plugged all the interconnects and applied power > through a variac. No problems at all in ramping up to > 120v. Soon I had 150w CW and 100 phone output. > > I am really impressed how well the B&W 5100 is built > and how easy it is to work on and put back on the > air. > > I'll lug it upstairs and put it on the air for the > DX-60 net tomorrow. > > So I ask you fellow buzzard ops, what is your favorite > "best built ham transmitter?" > > 73 DE KA4JVY > Mark > ncreases necessitate this change. First major across the board increase since 1994. Sign Up for Juno Platinum Internet Access Today Only $9.95 per month! Visit www.juno.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho)
Mark, of passing interest- you mentioned the T-368- guess who designed it? Note the use of all that nice ceramic. Yes, the 5100 is a cool radio. The modulator is just a bit small but? You would get some boo-hoos from Collins people, but I think a good close second. Definitely easier to work on. I have a early 5100 [1000 serial number] 1953 vintage, in real good original condition, its definitely one of my better BAs. I does need a good 1/2 hour warm-up, but its real stable after that. Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "amradio@mailman.qth.net" Subject: [AMRadio] B&W 5100 Possibly the best built ham transmitter? (imho) Date: Sat, 23 Nov 2002 10:47:09 -0800 (PST) I just finished cleaning up the B&W 5100 I picked up at the Butler meet last Summer. I don't know what prompted me to buy it , but now I am sure glad I did. Maybe it was all the great food ( including Russ's fabulous baked beans of mass destruction HI!) What strikes me the most about this radio is how well it is designed and constructed. My only complaint about the design is that the mode switch intereferes with access to one of the audio input shield screws - boo hoo. Other than that, this is by far the best built radio I own in terms of construction, ease of servicing and overall engineering. Better than my Collins, Halicrafters, WRL, Drake, Eldico etc. The only thing that comes close is my TMC gear or the T-368 - but these were obviously not for the amateur market. Modular construction allowed for easy replacement of a few parts in the modulator. I essentially replaced several .001 with some .02 and two out of spec resistors. The use of an oil filled cap in the filter was a nice change. Typically one has to take a small loan for direct replacements or cobble up a string of electrolytics with eq. resistors. In fact I only had to replace three electrolytics - the double 20 @ 450v and a 20 @150v. A wire brush was very useful cleaning up the milled edges on the knobs. I plugged all the interconnects and applied power through a variac. No problems at all in ramping up to 120v. Soon I had 150w CW and 100 phone output. I am really impressed how well the B&W 5100 is built and how easy it is to work on and put back on the air. I'll lug it upstairs and put it on the air for the DX-60 net tomorrow. So I ask you fellow buzzard ops, what is your favorite "best built ham transmitter?" 73 DE KA4JVY Mark __ Do you Yahoo!? Yahoo! Mail Plus Powerful. Affordable. Sign up now. http://mailplus.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus
Re: [AMRadio] Sell or Trade: DX-100 Parts Set, BC-451A, etc
Yes OK Don, I am interested in the DX-100, sorry, I don't have any of the items you want. What would you want for the '100? I could make an offer sight unseen. I need the parts as I am working on another basket case '100. Thanks Russ. From: "Merz Donald S" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: ,"baswaplist" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>,"Old Tube Radios" <[EMAIL PROTECTED]> Subject: [AMRadio] Sell or Trade: DX-100 Parts Set, BC-451A, etc Date: Wed, 20 Nov 2002 12:09:53 -0500 PREFER TO TRADE BUT WILL SELL IF NECESSARY DX-100 Parts unit. Dirty but all there except cabinet. One unoriginal front panel hole. Some knobs are broken or deformed. See wanted list below. BC-451A SCR-274N control box. I have 2 of these. One is NOS in the box. See wanted list below. Also available: Original NOS manual for Navy WWII-era JP-2 Sound Receiving Equipment. Most Wanted List TS-164/AR cabinet, with or w/o the BC-221 Freq Meter. Modified is fine. Can be missing the front "door". I just need the cabinet. GP-7 Accessories: Tuning unit F and CAY-23219 pilot's control box. Wireless Set Number 19 Mark II tank radio accessories: "A" set antenna, any antenna cables, the interphone amplifier and the linear amplifier. ARB receiver canvas cover and dynamotor. ARC-5 single receiver rack shockmounts (need two) wanted. I have the racks, just need the shockmounts. Eimac 50T, 75T or 150T tubes. Also consider RCA 808 as a sub. Book: F. C Jones, "Cathode Modulation" published in the 1930's. Book: Don Wallace, W6AM, Amateur Radio's Pioneer Any help appreciated. 73, Don Merz, N3RHT ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success!
Yes, its darn good for 1955 technology. Russ. From: "Tommye & Jim Wilhite" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success! Date: Wed, 20 Nov 2002 09:23:45 -0700 Right on Russ. Mine is sensitive, quite and with both the crystal filter and IF selectivity, able to copy stations many receivers cannot do. My only two complaints about the rig is the alignment of the coils in the front end and L6 which can be a bear to get right. You will find a service bulletin about replacing the coil in L6 with a crystal. I didn't have to replace any caps in it either and unlike most National receivers, didn't even have to replace resistors. Jim de W5JO > Mark, hope you like the beans... the NC-300 is a unique rx in that it > does not run hot, never done any coupling/ bypass cap > replacements/ never needed them. I had a power supply choke > open up, the ususal 4H4 ballast, few week tubes, just align the > thing, when you think its performance is anemic. > > > > > > > >From: Mark Foltarz <[EMAIL PROTECTED]> > >Reply-To: amradio@mailman.qth.net > >To: amradio@mailman.qth.net > >Subject: Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success! > >Date: Tue, 19 Nov 2002 00:02:15 -0800 (PST) > > > >Well after two days of fiddling around I finally got > >it. > > > > I went back over the IF alignment. Apparently I got > >this right the first time around. > > > >The one thing that was not mentioned in the manual ( > >at least the copy on the BAMA site) was that the coils > >for 40 - 10 have TWO adjusting turns available for > >setting the bottom end of the oscillator tracking. > >Once I figured that out it all seemed to snap into > >place. 10 meter through 40 meter bands came together > >pretty quickly. > > > >Then while attempting to adjust the 160 & 80 meter > >oscillator coils I discovered that the adjusting turns > >were fatigued to the point where they were broken. It > >was obvious that someone had really screwed around > >with this radio. > > > >After a bunch of chassis, potentiometer, and switch > >cleaning, this hulk of a radio is coming to life. > > > >Thanks Jim, Gary and Russ for the info. > > > >73 DE KA4JVY > >Mark > > > >__ > >Do you Yahoo!? > >Yahoo! Web Hosting - Let the expert host your site > >http://webhosting.yahoo.com > >___ > >AMRadio mailing list > >AMRadio@mailman.qth.net > >http://mailman.qth.net/mailman/listinfo/amradio > > > _ > Tired of spam? Get advanced junk mail protection with MSN 8. > http://join.msn.com/?page=features/junkmail > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success!
Mark, hope you like the beans... the NC-300 is a unique rx in that it does not run hot, never done any coupling/ bypass cap replacements/ never needed them. I had a power supply choke open up, the ususal 4H4 ballast, few week tubes, just align the thing, when you think its performance is anemic. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success! Date: Tue, 19 Nov 2002 00:02:15 -0800 (PST) Well after two days of fiddling around I finally got it. I went back over the IF alignment. Apparently I got this right the first time around. The one thing that was not mentioned in the manual ( at least the copy on the BAMA site) was that the coils for 40 - 10 have TWO adjusting turns available for setting the bottom end of the oscillator tracking. Once I figured that out it all seemed to snap into place. 10 meter through 40 meter bands came together pretty quickly. Then while attempting to adjust the 160 & 80 meter oscillator coils I discovered that the adjusting turns were fatigued to the point where they were broken. It was obvious that someone had really screwed around with this radio. After a bunch of chassis, potentiometer, and switch cleaning, this hulk of a radio is coming to life. Thanks Jim, Gary and Russ for the info. 73 DE KA4JVY Mark __ Do you Yahoo!? Yahoo! Web Hosting - Let the expert host your site http://webhosting.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail
Re: [AMRadio] NC300 Oscillator Tracking Nightmare
Yes Mark, it is difficlt and time consuming, but follow the book, if you get it right, its a real hot performing receiver. I think when I did it [ the alignment] I had to make the adjustments about 10 or more times on each band before I got it to track. Its worth the effort, so be patient. Its really an outstanding receiver for its age. Good luck, Russ. From: Mark Foltarz <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "amradio@mailman.qth.net" Subject: [AMRadio] NC300 Oscillator Tracking Nightmare Date: Sun, 17 Nov 2002 20:12:26 -0800 (PST) Hey has anyone done an alignment on a NC300? I am having fits trying to get the dial tracking the ocsillator. It seems impossible to get either end to within 60Khz. I downloaded the manual from BAMA but I think there must be a trick I'm not privvy to. Adjusting the oscillator coils by twisting that wire in the middle of the form is really weird. TNX & 73 DE KA4JVY Mark __ Do you Yahoo!? Yahoo! Web Hosting - Let the expert host your site http://webhosting.yahoo.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
RE: [AMRadio] New link to Info on AM and legal power limits.
Hey Guys- just in passing, I want to tell you, I am running a Johnson Adventurer and plate modulating it with an Eico 730 modulator. [pair of EL34s to a single 807. It does about 20 watts out. But with all that available audio, I get real good reports all the time. QSB is the only problem. Russ. From: "John E. Coleman" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] New link to Info on AM and legal power limits. Date: Wed, 2 Oct 2002 21:15:53 -0500 Thanks Brian: When I think back about the T-60s, DX40s and DX60s, as I remember, a friend had recently acquired a new Ranger that had the 6146 running the same voltage but with plate modulation. That's what really changed my mind. When I built the external modulator, which by the way was a pair of 1625s, to plate modulate the T-60 which had a 6DQ6 final, I then had the equivalent to the Ranger (I already had a home brewed VFO). There was no comparison to the way it was. There was a lot of difference in the price of a T-60 verses a Ranger. So for the money it was a great rig and I understand it would operate on 6 meters, although I never did. Tnx fer the comments: John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Carling Sent: Wednesday, October 02, 2002 8:10 PM To: amradio@mailman.qth.net Subject: RE: [AMRadio] New link to Info on AM and legal power limits. Great web page. I can't say that I agree with all of the remarks about controlled carrier modulation. I used to own a T-60 and it did great. A good old DX-60 sound great sometimes. Same way - very little idling carrier power, but tons of modulation power. Those little rigs make 30 watts of AM sound like 100 watts. OK they may not have a BAND-BLANKING carrier like some of the 300-400 watt plate mod rigs out there, but when adjusted properly they can be very intelligible on the air and if you use a D-104 or such on them, often give very pleasant sounding audio, in my estimation. Just some food for thought. I wouldn't mind having a T-60 or DX-60B with a digital VFO and drive one of my Thuderbolts with it in AM linear mode. Bet I'd be heard better than with a 30 watt plate mod rig all by itself (grin!) ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] ARRL Atlantic Div. Director Candidates
Never heard of them- probably do not know what AM is. From: michael m oxenreider <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: [AMRadio] ARRL Atlantic Div. Director Candidates Date: Wed, 2 Oct 2002 14:16:15 -0400 Hi All. Just got a ballot for Atlantic Division ARRL Director. Running are Bernie Fuller N3EFN and Anthony Gargano N2SS. Anyone know anything about how they stand on AM? Thanks and 73 Mike WB3CTC GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/. ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Chat with friends online, try MSN Messenger: http://messenger.msn.com
Re: [AMRadio] Nice find at tailgate swap yesterday
Yes Mahlon, the IT-28, which is what I have is a real winner. I am real fussy about my test gear, the balance adjustment is a bit tweaky, but you can test them down to a few pf. Fixed a lot of stuff using this item.Russ. From: Mahlon Haunschild <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: [AMRadio] Nice find at tailgate swap yesterday Date: Sun, 22 Sep 2002 18:45:23 -0500 Hello, list. Picked up an older Heathkit IT-11 capacitor checker at a tailgate swap yesterday for $10. I've been shopping 'round for something more sophisticated, like an old Sprague Tel-Ohm-Ike analyzer, but hey, for $10, who cares? Gotta tell ya, this unit is way more capable than I thought it was going to be. The leakage test can be conducted at any voltage from 3 to 600 volts, which should cover most anything we are likely to come in contact with in our boatanchors. And the capacitance bridge is reasonably accurate, too. Additionally, it can be used to determine transformer turns ratios. If you find one of these, know that apparently the older version of the IT-11 used paper capacitors in the bridge circuit, which I had to replace with polyesters before the thing would work properly. The old wax-covered paper capacitors leaked like sieves. The IT-28 is apparently the same design, just in the newer tan-colored Heathkit paint scheme. The only drawback that I can think of is that these testers use a 6E5 eye tube, which is hard to come by. The later version of the IT-11 and, I imagine, all of the IT-28s have a dual-voltage power transformer. Mine is 117 VAC only. -- regards, Mahlon - K4OQ Icom IC-756 / IC-765 / IC-821 / IC-W32A Drake R-4C / T4-XC / TR-4C / MN-2000 Gonset GSB-100 Johnson Viking Ranger / Viking Valiant Heathkit Apache / Mohawk / Shawnee Alpha 91b / B&W PT-2500A National NC-303 / NCX-3 R-390A Open Line of Credit with Gulf Power ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] 10 mtrs ( AM window ) has been open this last week
Good deal Thomas, yes check it out today. 6 land was pounding in Russ Erie PA. From: "K0PJG" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: [AMRadio] 10 mtrs ( AM window ) has been open this last week Date: Sat, 21 Sep 2002 05:58:57 -0400 Ten mtrs has been open enough that I have worked several Old Friends es several new friends lately; VK2BA -David PA0LCD - Cor G4XPY - Dave KK7JK - Ray I5KAP - Franko ( still 5 watts ) Looks like the Solar numbers will be peaking again in early Oct. So please join in the fun on ten mtr AM when you can. Freq. most popular are 29.000 to 29.100kc. 73, Thomas F. Fischel 8274 Cullowhee Mountain Road Cullowhee, NC 28723 [EMAIL PROTECTED] To view Collins equipment ; http://www.qrz.com/callsign/k0pjg ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] Globe King
Yes Charles, I neglected to say, I did replace all old electrolytics in the speech amp. The couplettes don't seem to be a problem. As I remember- does the speech amp also have a compressor? That seems to work OK as well, without distortion. Well the reason I used 1500 volts in the modulator is because thats what I had available. The replacement was bad and the maker would not make good on it- so mods came into play. My intention was to keep it as original- but when the 816s kept flashing, I found they are as rare as hens teeth. Too pricy for something easily replaced. I have not run mine in several years also. Neighbors complain- RFI big time. Another story. 73s Good luck Russ From: Charles Ring W3NU <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] Globe King Date: Thu, 19 Sep 2002 15:11:36 -0400 russ dworakowski wrote: > Charles, I have a 500B, that came to me as basket case. I ended up with > all new iron. Hopefully, yours was stored well, and not ina damp > location. If so, it would be good to just fire it up and let it dry out. > Its amazing how much moisture those old open transformers > soak up.When all said and done,my GK 500B, had changes in the > modulator- A higher voltage on the plate transformer- 1500v. I put neg. 5 > volts bias on the 811s. In the speech amp, I did not change anything. I > used a D104 mic and I got real good audio rpts. I also solid stated the > modulator power supply- the 816s kept flashing over,so bye bye. Also > switched to 3B28s in the RF power supply. > Have fun! Russ I have owned my 500A for 30 years but havent used it for maybe 15. It seems to have survived basement storage with all iron intact. It already has 3B28's and i can see that the 816's will be at least an inconvenience so they might go. I have a D104 and will try it before i modify the speech amp, but eventually i want to get rid of the couplettes and try a Shure SM5B and a broadcast mic compressor left over from my years as a broadcast engineer. I am not inclined to trying to boost the modulation since i won't be in an Arbitron-driven loudness war. I do see a number of very old original small electrolytic caps in the modualtor that probably should be replaced. 73 de W3NU ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Chat with friends online, try MSN Messenger: http://messenger.msn.com
Re: [AMRadio] Globe King
Charles, I have a 500B, that came to me as basket case. I ended up with all new iron. Hopefully, yours was stored well, and not ina damp location. If so, it would be good to just fire it up and let it dry out. Its amazing how much moisture those old open transformers soak up.When all said and done,my GK 500B, had changes in the modulator- A higher voltage on the plate transformer- 1500v. I put neg. 5 volts bias on the 811s. In the speech amp, I did not change anything. I used a D104 mic and I got real good audio rpts. I also solid stated the modulator power supply- the 816s kept flashing over,so bye bye. Also switched to 3B28s in the RF power supply. Have fun! Russ From: Charles Ring W3NU <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: [AMRadio] Globe King Date: Wed, 18 Sep 2002 12:26:36 -0400 The time has come to revive my Globe King 500A, which is in generally good condition and mostly unmodified. Where can I find info on it, such as how to eliminate the "couplettes" in the modulator, and anything else I need to know. I don't have any ER issues but i do have much or most of AM Press/Exchange 1984-92. 73 de W3NU ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] 500.00 Rangers
Yes I know, $500 rangers. But look, you don't have to buy it! Just how bad do you want one anyway?I have 2 that I paid $25.00 each for. Money in the bank collecting interst? You bet. To be certain, I would not pay $500 for any Johnson Ranger, not even NIB. But I already have 2. If somone is interested, then I guess its a matter of how interested he or she is. Remember the Hallicrafter SX-115? How much now? I have seen $3000 bids. This is no $3k receiver, but just how badly did that person want one? I have also seen $20,000 for a Collins KW-1. Sorry folks, and no offense to you Collins collectors, but this is no $20k transmitter. Bottom line- what color is your money? or better said "how bad do you want one? Russ-WB3FAU From: "Bill Marvin" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: Re: [AMRadio] 500.00 Rangers Date: Thu, 29 Aug 2002 11:29:43 -0400 - Original Message - From: "RoadKing" <[EMAIL PROTECTED]> To: Sent: Wednesday, August 28, 2002 9:03 PM Subject: [AMRadio] 500.00 Rangers > Fellows, are we promoting our hobby or our EGOS... Have you seen the current price of a 1965 GTO in excellent condition? Stop whiningplease! ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] Going to start parting out an Apache
Hey Bob, hows you doing? I have a DX100 thats taken up a bad habbit something is smoking under the chassis. I don't know what yet, so may need a part from that part out. Hopefully you have not sold all the parts yet? I will get back to you - thanks Russ. From: [EMAIL PROTECTED] Reply-To: amradio@mailman.qth.net To: AM Radio Subject: [AMRadio] Going to start parting out an Apache Date: Wed, 21 Aug 2002 16:00:03 -0400 Folks, I have an unrestored Heathkit TX-1 Apache. Going to start removing the transformers and parting it out. No reasonable takers to date, thinning out the "herd" so to speak. I understand many are the same as used in the DX-100. Bob - N0DGN Craf-T-Bob (Because I love Hallicrafters!) R-390A EAC '67, R-390A Collins '52, BC-610I, BC-939B, and BC-614E ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] D-104 Hardware
John, if 4-40 is too small and 6-32 is too big, then try 5-40. I thought 6-32 was the right size. You could just run a 6-32 tap in the base holes. Russ. From: "John Beasley" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: [AMRadio] D-104 Hardware Date: Mon, 19 Aug 2002 06:35:47 -0500 Does anyone know what size of screw is used on the base plate of a D-104. I tried both 6X32 and 4x40 and neither seem to fit. Thanks John, WAØSTX --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. Please post in Plain-Text only.--- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Chat with friends online, try MSN Messenger: http://messenger.msn.com
Re: [AMRadio] Heathkit Apache(s)
I just bought a DX-100 for $60. It needs work, but its an easy fix. Good luck with the Apaches. Russ. Bob, I recently bought a DX-100 that needs work. I only paid $60 for it. Good luck getting $250 for an Apache. Russ. From: [EMAIL PROTECTED] Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] Heathkit Apache(s) Date: Thu, 15 Aug 2002 16:05:39 -0400 Russ, For the modified one I'd like to get $250. I paid $200 for it before I got it going "right". Bob - Original Message ----- From: "russ dworakowski" <[EMAIL PROTECTED]> To: Sent: Thursday, August 15, 2002 12:58 PM Subject: Re: [AMRadio] Heathkit Apache(s) > Bob, please, give a ballpark figure of what you think is a reasonable > offer? Russ. > > > >From: [EMAIL PROTECTED] > >Reply-To: amradio@mailman.qth.net > >To: AM Radio > >Subject: [AMRadio] Heathkit Apache(s) > >Date: Wed, 14 Aug 2002 17:30:01 -0400 > > > >I have two Heathkit Apaches I'd like to sell. One has had the W3SCC/W3YGC > >audio modifications done to it, plus feedback added. The other is not > >modified, but the final fan motor is bad. > > > >Will drive some distance to meet, won't try to ship. There is too much > >mass > >on the back side of the chassis. > > > >Reasonable offers? Trades? > > > >Bob - N0DGN Craf-T-Bob (Because I love Hallicrafters!) > >R-390A EAC '67, R-390A Collins '52, BC-610I, BC-939B, > >and BC-614E > > > >___ > >AMRadio mailing list > >AMRadio@mailman.qth.net > >http://mailman.qth.net/mailman/listinfo/amradio > > > > > _ > MSN Photos is the easiest way to share and print your photos: > http://photos.msn.com/support/worldwide.aspx > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] Heathkit Apache(s)
Bob, please, give a ballpark figure of what you think is a reasonable offer? Russ. From: [EMAIL PROTECTED] Reply-To: amradio@mailman.qth.net To: AM Radio Subject: [AMRadio] Heathkit Apache(s) Date: Wed, 14 Aug 2002 17:30:01 -0400 I have two Heathkit Apaches I'd like to sell. One has had the W3SCC/W3YGC audio modifications done to it, plus feedback added. The other is not modified, but the final fan motor is bad. Will drive some distance to meet, won't try to ship. There is too much mass on the back side of the chassis. Reasonable offers? Trades? Bob - N0DGN Craf-T-Bob (Because I love Hallicrafters!) R-390A EAC '67, R-390A Collins '52, BC-610I, BC-939B, and BC-614E ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
Re: [AMRadio] Diode information
Jim, it wud probably be pretty tuff to get exact replacements. Generics wud be better anyway. You need to see if there is any voltage doubling done here, in the supply. You really need to measure supply voltage at the diodes. Then its just a matter of voltage rating. The current-250 ma. is not going to be a major factor. I know you don't want to do it, but a few 1000v diodes in series in each leg will be a lot more reliable. Russ. From: "WILHITE, JIM" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "AM Radio Discussion list" Subject: Re: [AMRadio] Diode information Date: Sat, 20 Jul 2002 11:16:59 -0600 Thanks for the response Russ. Unfortunately I don't have the diagram of this particular installation and remembering the plate voltage falls into the catagory of wife's & kid's birthday, anniversary and such. The tube probably had 2000 or so volts on the plate and specs said 250 mils. It has been about 20 years since I worked on one of these and I just can't remember. But considering max plate voltage of 2000 and current of 250 mils for the application they were in, they must be rated on up there. Don't really want to build up 1N4007s in this particular project. I will look for some 1N2637s, they would look better but will do the 1N4007s if I have to. TNX & 73 Jim de W5JPW Sorry Jim, nothing specific on those diodes. Do you have a schematic? Easy enuf to figure value of replacements- Do you know how much B+ voltage there is? And the final plate current? You can guess from there, as for diode values. Just use general purpose replacements. I will detail more if you need? Russ. --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. Please post in Plain-Text only.--- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Chat with friends online, try MSN Messenger: http://messenger.msn.com
Re: [AMRadio] Diode information
Sorry Jim, nothing specific on those diodes. Do you have a schematic? Easy enuf to figure value of replacements- Do you know how much B+ voltage there is? And the final plate current? You can guess from there, as for diode values. Just use general purpose replacements. I will detail more if you need? Russ. From: "WILHITE, JIM" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: "AM Radio Discussion list" Subject: [AMRadio] Diode information Date: Fri, 19 Jul 2002 17:07:04 -0600 Good afternoon all, I am trying to find some information about diodes in a bridge circuit that was in the power supply of a GE hi power base station. One of the diodes has the following numbers on them, none of which I recognize. 115808 HF 3643 GIJ 7506 The above information is on one diode in the bridge with a logo I do not recognize. The other three only has the number 115808 on them. These diodes were on a board with a GE Part Number PL19C303735G2. As I recall this was either a high band, high power or low band, high power station. If memory serves correct it had a 4CX250 in the final. Does anyone recognize these numbers and can give me the ratings for the diodes? 73 Jim de W5JPW --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. Please post in Plain-Text only.--- ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com
Re: [AMRadio] EICO 720 & 730
Don, I did Steve's mods to the 730. [WB3HUZ] I think its in his website, I always get great audio rpts using my Eico 730. As you probably know, they did some great hi-fi tube amps in the 50's and 60's. Russ. From: "Donald Chester" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: amradio@mailman.qth.net Subject: Re: [AMRadio] EICO 720 & 730 Date: Sun, 07 Jul 2002 06:15:24 + I use a 720/730 on 10 m. I feed the 720 on 40m. using a digital vfo. There are no substantial mods to the 720, other than PTT and replacement of a burnt-out power transformer. I made the following modifications to the 730: (1) I removed the clipper stage and its associated components. (2) I installed a 40 hy 120 mill modulation reactor and mounted it in the space where the clipper tube used to be. (3) I disassembled the modulation transformer and restacked the laminations like a power transformer, eliminating the gap in the core. (4) I changed the values of some coupling capacitors, and I recall removing a bypass cap across the mod tranformer (I think). After the mods, it shows flat response from 20 to over 11,000 cps with no visible distortion on the o'scope. I feed audio from the 500 ohm line in my audio rack thru a step attenuator to the "phone patch" input on the back of the modulator, bypassing the low level mic preamp. I changed the mod transformer turns ratio tap to give the least amount of stepdown, therefore improving the positive peak capability. I wired up a PTT circuit that works off the same 28 vdc relay line that controls the rest of the station. I always get good reports on the signal quality when the band is open. I use a simple quarter wave ground plane with 3 drooping radials. Don K4KYV _ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
RE: [AMRadio] EICO 720 & 730
Ron, you'll want to run less final plate current. RCA specs for a 6146 calls 110 mils on the plate max. Modulator resting current should be about 50 to 80 mils. Russ From: "Ron" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: RE: [AMRadio] EICO 720 & 730 Date: Sun, 7 Jul 2002 07:42:23 -0500 Hi Don: Thank you for the information on your station. It sounds as if you have taken the modulator to the limit and I hope to hear you on the air on AM some day soon. I am sure it really sounds good! I do have one question on using the 720/30 pair together. That has to do with loading up the 720. Do you load the 720 to about 120-150 ma final current and then switch in the modulator. What is the resting plate current on the 720 when it is on the air? I am about to finish a restoration on the 730 modulator and put it on the air with the 720 and do not want to "over drive" the transmitter. Thanks, Ron, AB5WG -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Donald Chester Sent: Sunday, July 07, 2002 1:15 AM To: amradio@mailman.qth.net Subject: Re: [AMRadio] EICO 720 & 730 I use a 720/730 on 10 m. I feed the 720 on 40m. using a digital vfo. There are no substantial mods to the 720, other than PTT and replacement of a burnt-out power transformer. I made the following modifications to the 730: (1) I removed the clipper stage and its associated components. (2) I installed a 40 hy 120 mill modulation reactor and mounted it in the space where the clipper tube used to be. (3) I disassembled the modulation transformer and restacked the laminations like a power transformer, eliminating the gap in the core. (4) I changed the values of some coupling capacitors, and I recall removing a bypass cap across the mod tranformer (I think). After the mods, it shows flat response from 20 to over 11,000 cps with no visible distortion on the o'scope. I feed audio from the 500 ohm line in my audio rack thru a step attenuator to the "phone patch" input on the back of the modulator, bypassing the low level mic preamp. I changed the mod transformer turns ratio tap to give the least amount of stepdown, therefore improving the positive peak capability. I wired up a PTT circuit that works off the same 28 vdc relay line that controls the rest of the station. I always get good reports on the signal quality when the band is open. I use a simple quarter wave ground plane with 3 drooping radials. Don K4KYV _ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ Send and receive Hotmail on your mobile device: http://mobile.msn.com
