Re: [drakelist] Cap rating
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Doc - Wow, not pretty! :-) The original was a ceramic trimmer of 3 - 50 pF, with a single 27 pF 1 kV cap in series with it. This is the neutralization cap and so has to handle the full plate voltage (700 VDC no load) plus peak RF voltage. This must be a very early TR-3 (s/n <4000) to have the ceramic trimmer in that position. Later units used a small air variable here, a Hammarlund MAPC, 2.7 - 8.4 pF, with a 12.5 pF @ 2KV disc ceramic in parallel. I suspect they had problems with that ceramic trimmer breaking down (as did Collins in early 75S-1s) and changed to the air variable. The same air variable and parallel cap was used throughout the rest of the TR-3/4 series, so you can get one from just about any parts unit. If you can't find one, I may have one here somewhere. I'm not too well organized after the move! Ya really shouldn't move after 25 years on one house, especially if you're a pack rat..! :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Halo.net wrote: Garey, You'll recognize the disk caps in the attached picture from the finals plate circuit.. these are in bad shape & I can't lift any info from them. I have a manual on order but no schematic on hand.. Can you tell me off hand what the capacatance is and voltage rating? Thanks.. Doc WB6WAD -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB problem?
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Boyd - Well I've never noticed the bias voltage on the relay tube going up with increased AF gain, but then I've never looked! :-) Other things that can cause the relay to "hang" is if the ANTI-VOX is turned up too high (might key in on AF Gain affecting bias), or if the VOX is turned up too high, or if R106 has gone up in value. Try turning the ANTI-VOX down all the way, and then bringing up slowly until it just prevents tripping of VOX. As you can see, it's a fairly high impedance circuit, so can be difficult to troubleshoot. You should be seeing closer to -5 to -6V on Pin 2 in receive. Depending upon your unit serial number, you might try reducing R135 from 68k to 33k. This "stiffens" the cutoff supply and you should see closer to -10V on PIn 2 with key-up. I have seen a leaky cap at C205, but not likely. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Boyd Van Horn wrote: Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW *//* -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] From Steve WA7EZB - Parting out Drakes
I noticed that too. such slime _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Don Cunningham Sent: Thursday, November 15, 2007 9:09 PM To: [EMAIL PROTECTED] Subject: Re: [drakelist] From Steve WA7EZB - Parting out Drakes Fixit Fox is the mass murderer of TR7's!
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
Fixit Fox is the mass murderer of TR7's!
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
sounds like Fixit fox! ** See what's new at http://www.aol.com
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
Steve & Others: I'm not sure why you all think the seller is "fixit-fox" (Charlie Talbott, K3ICH)..He has sold me many difficult to find parts to refurbish several TR-7's (The AF/RF on/off switch for example)...Always easy and fair to deal with, and even sent me some parts before he got payment. Now Martin who sells as "Radio-Mart" and buys as "Gottahaveit"that's a horse of a different color. i.e., Running between 3.5 and 4% E-Bay complaintsfor about 5,000 sales that's a bunch of pissed-off people. And now he's parting out several brands of radios, including a TR-7...I wouldn't buy any of the parts from him, since the last (and only) part I bought from him was junkA National S-Meter, NFG, and didn't even have the glass front on it.He's even trying to sell off the individual metal pieces.. At least when you buy from Charlie, you know the part is going to work, etc. Enough of this I guess...not trying to start a war. Bill W6FF (ex-W6WCW) Santa Barbara, Ca. ** See what's new at http://www.aol.com
RE: [drakelist] From Steve WA7EZB - Parting out Drakes
"Ron Baker" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- A year ago or so I saw one of the stripped TR7 Chassis on eBay, not sure who was selling it, there are 2 or 3 doing that now.Anyway it was a reasonably high serial number, so I bought it, the front panel assembly (sold separately), and several of the boards (again sold separately). I put it all back together and scrounged a couple of missing boards and got it working. With little effort beyond reassembly the radio worked and still works fine. So I know for sure there is at least one TR7 that came back from the dead and is enjoying a 2nd chance at life. Ron / WB4HFN -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of john Sent: Thursday, November 15, 2007 9:33 PM To: [EMAIL PROTECTED] Subject: Re: [drakelist] From Steve WA7EZB - Parting out Drakes john <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Yep, I've seen that guy too. Some people will stoop so low as to pimp working radios just for a buck. Sad, but there's always folks who take a mercenary approach. The best bet is to not buy from the guy, and hope he stews in a sea of chopped up radios. John K5MO At 08:58 PM 11/15/2007, you wrote: >Fellow Drake pals > >I was on our favorite un-auction site looking for a fan for my PS-7 and >our favorite collector and seller of "collector quality" Drake and >Collins gear not only had a fan, but was bragging about parting out a >working TR-7. I don't know what would make someone who collects or >sells vintage radios try and profit more from the parts than a working >radio and bragging about it, but it bothered me enough that I had to >say something. I have a lot of pride from restoring an old wreck of a >vintage Drake radio like many of you do and it is a lot of work. While >I am trying to give new life to one of them, this guy is killing them >and selling the organs. Sorry for venting, but I really enjoy reading >the e-mails and looking at the struggles many of us have trying to >restore and use Drake equipment and helping each other. I hope you all >know who I am talking about and avoid giving him any credibility by >purchasing from him. There, I feel a lot better. > >Thanks > >Steve >WA7EZB -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
[EMAIL PROTECTED] made an utterance to the drakelist gang -- There are actually two such fellows now, if not more... ** See what's new at http://www.aol.com -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB problem?
Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Bias voltage is relied on to open the relay by cutting off the 6EV7 relay tube and if that voltage is low because of leaky electrolytics or ripple in the Bias supply in the AC-3/4., the tube doesn't cut off as quickly. Since you have eliminated the supply, another possibility is that the 6EV7 is slightly gassy, which again causes tube to want to continue conducting after it is told to cut off, especially after long transmissions! Yet another possibility is that the final tubes are dropping in emission, which requires you to set the bias voltage more positive to set the idle current to the proper value, again resulting in reduced negative voltage to cut off the 6EV7. Lastly, there are several very high value carbon composition resistors in the biasing for the VOX. ANTI-VOX and Relay circuits that can increase in value with age, resulting in insufficient cut off bias for the 6EV7. A rule de thumb is that the bias voltage at the Final grids is typically -60 to -65VDC for nominal idle current. Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Bill Ellis wrote: > Recently having put my T-4XB/R-4B combo back on the air after 1 year > off, I'm finding that when I put the T-4XB in spot mode, I can't get > the relay to return to the receive mode. This is not keying the > finals(I don't think), it just seems to hang up in the spot mode. > About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't > think that is the problem. Now I know the the anti-vox and vox delay > affect how long the relay remains engaged.I have tried that > combination with no success. I could just be getting the wrong combo. > My question is where is a good starting point for these two controls. > Also, could this be a bad 6EV7? > > Thanks for any help & 73's > > Bill, WB9CAC > Tempe, Az -- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
john <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- Yep, I've seen that guy too. Some people will stoop so low as to pimp working radios just for a buck. Sad, but there's always folks who take a mercenary approach. The best bet is to not buy from the guy, and hope he stews in a sea of chopped up radios. John K5MO At 08:58 PM 11/15/2007, you wrote: Fellow Drake pals I was on our favorite un-auction site looking for a fan for my PS-7 and our favorite collector and seller of "collector quality" Drake and Collins gear not only had a fan, but was bragging about parting out a working TR-7. I don't know what would make someone who collects or sells vintage radios try and profit more from the parts than a working radio and bragging about it, but it bothered me enough that I had to say something. I have a lot of pride from restoring an old wreck of a vintage Drake radio like many of you do and it is a lot of work. While I am trying to give new life to one of them, this guy is killing them and selling the organs. Sorry for venting, but I really enjoy reading the e-mails and looking at the struggles many of us have trying to restore and use Drake equipment and helping each other. I hope you all know who I am talking about and avoid giving him any credibility by purchasing from him. There, I feel a lot better. Thanks Steve WA7EZB -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] From Steve WA7EZB - Parting out Drakes
"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang -- On Thu, 15 Nov 2007 17:58:07 -0800, Steve Brose wrote: >While I am trying to give new life to one of >them, this guy is killing them and selling the organs. In a certian vintage computer newsgroup that I am active in, such Neanderthals are known as "tin men". They know little and care less about the hardware they r a p e for dollars. 73 -Jim -- Ham Radio NU0C TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] From Steve WA7EZB - Parting out Drakes
Fellow Drake pals I was on our favorite un-auction site looking for a fan for my PS-7 and our favorite collector and seller of "collector quality" Drake and Collins gear not only had a fan, but was bragging about parting out a working TR-7. I don't know what would make someone who collects or sells vintage radios try and profit more from the parts than a working radio and bragging about it, but it bothered me enough that I had to say something. I have a lot of pride from restoring an old wreck of a vintage Drake radio like many of you do and it is a lot of work. While I am trying to give new life to one of them, this guy is killing them and selling the organs. Sorry for venting, but I really enjoy reading the e-mails and looking at the struggles many of us have trying to restore and use Drake equipment and helping each other. I hope you all know who I am talking about and avoid giving him any credibility by purchasing from him. There, I feel a lot better. Thanks Steve WA7EZB
