Re: [Drakelist] T-4XB Power Switch
Kevin, I have replaced several switches by prying off the bad one, and installing a new switch by trimming back the mounting tabs, and tack soldering it on. There are a few different styles of switches so you will need to locate the correct style. Back in the day Drake used to offer these so check with John Kriner, he may still have some. 73, Gary___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x am hifi mods
hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR-5 160 meter crystal
I am in need of a 160 meter crystal for the Drake TR-5..If anyone has one they will part with please send me a notede BillKY4U___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR7 operation on 60 meter questions
Anyone running the TR7 on 60 meters? If so... -how are you making sure you keep w/i the 50 watt PEP limit? -is the factory TR7 audio bandwidth w/i the 2.8 Khz channel limitation? -do you just tune 1.5Khz below center channel? -anything else? TNX es 73, Ron WD8SBB ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB Power Switch
Does John Kriner ever sell parts? Somehow I remember asking and the answer was no?? Or, in my advanced age, maybe it was Jeff Covelli that didn't sell parts. 73, Lee -Original Message- From: Gary Poland gpola...@cinci.rr.com To: Kevin LaHaie klah...@centricata.com; drakelist drakelist@zerobeat.net Sent: Sat, Feb 11, 2012 6:53 am Subject: Re: [Drakelist] T-4XB Power Switch Kevin, I have replaced several switches by prying off the bad one, and installing a new switch by trimming back the mounting tabs, and tack soldering it on. There are a few different styles of switches so you will need to locate the correct style. Back in the day Drake used to offer these so check with John Kriner, he may still have some. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB Power Switch
He sells a few such as pots and some Collins relays. Lee, w0vt -Original Message- From: kc9...@aol.com Sent: Saturday, February 11, 2012 9:42 AM To: gpola...@cinci.rr.com ; klah...@centricata.com ; drakelist@zerobeat.net Subject: Re: [Drakelist] T-4XB Power Switch Does John Kriner ever sell parts? Somehow I remember asking and the answer was no?? Or, in my advanced age, maybe it was Jeff Covelli that didn't sell parts. 73, Lee -Original Message- From: Gary Poland gpola...@cinci.rr.com To: Kevin LaHaie klah...@centricata.com; drakelist drakelist@zerobeat.net Sent: Sat, Feb 11, 2012 6:53 am Subject: Re: [Drakelist] T-4XB Power Switch Kevin, I have replaced several switches by prying off the bad one, and installing a new switch by trimming back the mounting tabs, and tack soldering it on. There are a few different styles of switches so you will need to locate the correct style. Back in the day Drake used to offer these so check with John Kriner, he may still have some. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB Power Switch
I have purchased several parts from John Kriner in the last few years, but he is now sold out of most parts. He sells on eBay (ID tr7dude), most being buy it now sales. 73, Bob WW3QB Does John Kriner ever sell parts? Somehow I remember asking and the answer was no?? Or, in my advanced age, maybe it was Jeff Covelli that didn't sell parts. 73, Lee -Original Message- From: Gary Poland gpola...@cinci.rr.com To: Kevin LaHaie klah...@centricata.com; drakelist drakelist@zerobeat.net Sent: Sat, Feb 11, 2012 6:53 am Subject: Re: [Drakelist] T-4XB Power Switch Kevin, I have replaced several switches by prying off the bad one, and installing a new switch by trimming back the mounting tabs, and tack soldering it on. There are a few different styles of switches so you will need to locate the correct style. Back in the day Drake used to offer these so check with John Kriner, he may still have some. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T-4XC alignment question
OK, decided today to align my T-4XC. According to the manual, RF Mixer stage trimmer alignment sectionthe T5 T4 need to be de-tuned before peaking the front 2 trimmers. Is this really neccessary? or can I just peak for max drive on all trimmers?? If I remmeber correctly that is what I did before with good success. Thanks, 73, Lee ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x am hifi mods
- Original Message - From: Carey Lockhart kc5...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, February 11, 2012 4:44 AM Subject: [Drakelist] t4x am hifi mods hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com Since he disconnects the VOX pot to accomplish this I also wonder. I wonder about the untended concequences of many of the mods for Drake stuff especially those for improving the audio. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T-4Xc alignment...another ?
OK, discovered something else...looks like Drake aligned the tuning rack based on a RED DOT coils form set. The brown glyptol is intact. But, My coils do not have any dots on them...did they go away? Or did Drake change the way they did this? I really don't want to touch them as they are all the same.and with pre-selector far CCW on 0...they are at 39/64 (RED DOT setting??) Thanks, 73, Lee ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4Xc alignment...another ?
Lee - I assume you mean 3/64. It's also possible that someone has been 'fixing' the pointer adjustment too!! I would NOT change anything and just go with where they are. I've seen them with 'red' on the top of the core and on the bottom of the core. I don't know what criteria were involved to make them a red dot or ... Possibly core lots? If it tunes up ok I wouldn't worry about it. Only thing I can think of would be an inability to reach the high end of 10M, or the low end of 160M. I have had to fudge a bit on 10m to avoid having the trimmer adjuster screw fall out! Suggest you put a drop of nail polish on the 10M screws, or they might change when you turn the radio on its' side! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com kc9...@aol.com wrote: OK, discovered something else...looks like Drake aligned the tuning rack based on a RED DOT coils form set. The brown glyptol is intact. But, My coils do not have any dots on them...did they go away? Or did Drake change the way they did this? I really don't want to touch them as they are all the same.and with pre-selector far CCW on 0...they are at 39/64 (RED DOT setting??) Thanks, 73, Lee ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 operation on 60 meter questions
On Sat, 11 Feb 2012 05:27:28 -0800 (PST), Ron wrote: Anyone running the TR7 on 60 meters? If so... I never have, but -how are you making sure you keep w/i the 50 watt PEP limit? You can keep the mic gain down and reference a PEP reading wattmeter. This works particularly well if you run an RF speech processor like the SP-75 or similar. Another method would be to apply a variable negative DC voltage to the ALC input and adjust so the ALC kicks in at 50 Watts. Very little current is required, you can do it with a 9V battery connected across a poteniometer. -is the factory TR7 audio bandwidth w/i the 2.8 Khz channel limitation? The SSB filter in the TR-7 is 2.4 KHz, so, yes. -do you just tune 1.5Khz below center channel? Most 60 Meter charts that I have seen will show a carrier frequency to use to set your signal on the center of the channel. Since the DR-7 is a true carrier frequency display, that makes it simple. If you really want to be spot on, you will need to figure the distance from the TR-7 carrier frequency to the middle of the 2.4 KHz passband, and use that value for your channel center offset. -anything else? Report back on how it goes. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime. HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake Virtual Museum - info
Fellow Drake Enthusiasts, The R.L. Drake Virtual Museum http://www.dproducts.be/drake_museum/ is for the time being not updated. The reason for this is that I have no access to the server after my museum-partner passed away last Christmas.Hopefully the ISP who hosts the files will help me. I'm in contact with them. I have decided to build up a NEW Drake Virtual Museum from scratch. It will contain a lot of new pictures and info in addition to what found in today's museum. The NEW R.L. Drake Virtual Museum is being launched page by page. You may follow my work at the new webiste here: http://www.drakemuseum.com It's under construction so there's not much there yet, but stay tuned ! Please observe that links in the menu is activated when the pages are ready to be presented. You are invited to come with suggestions and material for the museum pages. I hope to meet many of you at The Dayton Hamvention in May ! Sindre, LA6OP ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x am hifi mods
well my idea was to use the t4x and r4a as my am station. i did so a similar mod that made resting carrier adjustable to 20 watts. that was nice but then ssb would not play right. only one reply on this one so i am thinking this is not a very popular subject HI Carey - Original Message - From: Richard Knoppow 1oldle...@ix.netcom.com To: Carey Lockhart kc5...@gmail.com; drakelist@zerobeat.net Sent: Saturday, February 11, 2012 11:43 AM Subject: Re: [Drakelist] t4x am hifi mods - Original Message - From: Carey Lockhart kc5...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, February 11, 2012 4:44 AM Subject: [Drakelist] t4x am hifi mods hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com Since he disconnects the VOX pot to accomplish this I also wonder. I wonder about the untended concequences of many of the mods for Drake stuff especially those for improving the audio. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Setting the bias on a T-4X
Hello all-- I'm still new to the Drake world and just today got the T-4X I've been restoring over the past few months working thanks to one of Garey's CD-ROMs. I've got a question for the experts, however: I've read the instructions and set the bias control on my AC-4 so the plate amperes meter on the T-4X reads .07A. However, when I check the the actual bias voltage with a DMM, it's around -48 volts rather than the expected -65 volts. If I adjust the voltage to -65 V, I get about .02A on the meter. My question is, should I adjust the bias control for the specified voltage or the specified amperage? --Carl Maniscalco, KJ6BSO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB Power Switch
Hey, Kevin, Until you can find a parts rig with a good contact, jumper the power switch and switch the AC-4 with a power strip or other external means. From what I've heard, the switches are made of Unobtanium. 73, Steve Wedge, W1ES/4 I can't complain, but sometimes I still do. - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! - Original Message - From: Kevin LaHaie klah...@centricata.com To: drakelist drakelist@zerobeat.net Sent: Friday, February 10, 2012 10:30 PM Subject: [Drakelist] T-4XB Power Switch Well, it happens to all of us eventually! Took the T-4XB off the shelf for a little dusting off and warming up, and when I turned on, only heard a slight little 'thump' from the AC4 and then nothing. Upon closer examination (AC4 supply had just powered one of my TR-4C's so knew it was good) it turns out the on/off switch 'layer' of the 3 section pot has failed. I took it apart, I see how it works - a little 'wishbone' looking copper strap that gets shoved against 2 contacts to turn on the radio. One end had broken off. SO. Anybody out there successfully repaired (or rebuilt) the little copper wishbone, or grafted a new switch to the back of the dual potentiometer plus switch stack? I feel like a watchmaker of late - last week was soldering the spring to the internal movement of a Swan Mark II amplifier meter, now this? I can put a switch in a 'SPARE' hole in the back of the transmitter for on/off, but sure hate to lose the total ORIGINAL function of this transmitter - other wise in really nice shape! Any ideas boys and girls?? 73 Kevin K7ZS ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Setting the bias on a T-4X
Carl, You should adjust for the correct current. That said, the meter is at best difficult to read accurately. The better way is to measure the voltage drop across the cathode resistors. R32 and R33 on my T4XB schematic. First see that they are both still 15 ohms, if not replace. Then measure the voltage across those resistors while adjusting the bias. According to ohms law, they should have about .5 volts to be at 33 ma. So 2 tubes each at 33 ma each is 66 ma, which is very close. The little bit off is still far more accurate than the error in reading the meter. 73, Ron WD8SBB --- On Sat, 2/11/12, Carl Maniscalco kj6...@cox.net wrote: From: Carl Maniscalco kj6...@cox.net Subject: [Drakelist] Setting the bias on a T-4X To: drakelist@zerobeat.net Date: Saturday, February 11, 2012, 6:46 PM Hello all-- I'm still new to the Drake world and just today got the T-4X I've been restoring over the past few months working thanks to one of Garey's CD-ROMs. I've got a question for the experts, however: I've read the instructions and set the bias control on my AC-4 so the plate amperes meter on the T-4X reads .07A. However, when I check the the actual bias voltage with a DMM, it's around -48 volts rather than the expected -65 volts. If I adjust the voltage to -65 V, I get about .02A on the meter. My question is, should I adjust the bias control for the specified voltage or the specified amperage? --Carl Maniscalco, KJ6BSO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Setting the bias on a T-4X
Carl - Ron's method is very accurate, as long as you verify the resistance of the cathode resistors. Part of a restoration usually involves replacing the meter shunt resistor, (R36, with a 1W,) and then selecting a calibration resistor, (R38,) to make the panel meter read 70 mA (little mark between 6 and 8 on the meter) when confirmed by Ron's method. Once this is done, you can then rely on the meter to set the bias. Yes, you always set for the idle CURRENT, regardless of the BIAS voltage. GOOD PA tubes will just about all fall within the -60 to -65 volt range. The fact that yours take -48 indicates that one or both tubes are weak. Once the 15 ohm Cathode resistors are confirmed, you can use those voltage readings to 'match' a pair of tubes, they should be within 5% of each other for best results. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Ron wrote: Carl, You should adjust for the correct current. That said, the meter is at best difficult to read accurately. The better way is to measure the voltage drop across the cathode resistors. R32 and R33 on my T4XB schematic. First see that they are both still 15 ohms, if not replace. Then measure the voltage across those resistors while adjusting the bias. According to ohms law, they should have about .5 volts to be at 33 ma. So 2 tubes each at 33 ma each is 66 ma, which is very close. The little bit off is still far more accurate than the error in reading the meter. 73, Ron WD8SBB --- On Sat, 2/11/12, Carl Maniscalcokj6...@cox.net wrote: From: Carl Maniscalcokj6...@cox.net Subject: [Drakelist] Setting the bias on a T-4X To: drakelist@zerobeat.net Date: Saturday, February 11, 2012, 6:46 PM Hello all-- I'm still new to the Drake world and just today got the T-4X I've been restoring over the past few months working thanks to one of Garey's CD-ROMs. I've got a question for the experts, however: I've read the instructions and set the bias control on my AC-4 so the plate amperes meter on the T-4X reads .07A. However, when I check the the actual bias voltage with a DMM, it's around -48 volts rather than the expected -65 volts. If I adjust the voltage to -65 V, I get about .02A on the meter. My question is, should I adjust the bias control for the specified voltage or the specified amperage? --Carl Maniscalco, KJ6BSO ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Running R4A off car inverter
I'm still interested in running the Drake R4A of a DC/AC inverter. I found a Xantrex Pro Watt 600 watt. These are getting pricey, some hundreds of dollars. Will they work? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Running R4A off car inverter
Long ago I ran a huge R-388/51J3 on a smaller inverter and it worked fine. 73 de W3NU On 2/12/2012 0112, Neil M Califano wrote: I'm still interested in running the Drake R4A of a DC/AC inverter. I found a Xantrex Pro Watt 600 watt. These are getting pricey, some hundreds of dollars. Will they work? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
