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The WB4HFN website has a section with great information related to that power supply board. I just used it to resurrect a TR7 that was DOA. Good luck. 73 Tony N5DIM

Sounds like you are on the right track. Don’t ocelot the electrolytic capacitors on that supply as well. Gary W0DVN

Gary, I found a few minutes to work on the TR7 and discovered that the high VCO is not working at all. It does have the 10 vdc supply switch on it but I don't know if that reulagor is working or not.

It seems to me that the 6EJ7 was one of the first frame grid tubes. Supposed to be magic but then turned out to have problems. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

I thought about that, but you know how difficult it is to get to that tube.? Might have been easier making the mod than swapping the tube several times.? Now guess I'll move on to the audio and

I have done this mod and it is, indeed, effective. I have found that some receivers can benefit from simply trying multiple 6EJ7’s and selecting for lowest noise. The circuit is very sensitive to

Drake TR7 s/n 369 w/ 4 filters: 6kHz, 2.3kHz, , 1.8kHz,; 500Hz; $875 & split shipping CONUS; includes nice condition & fully functional PS7; photos here: https://photos.app.goo.gl/tXKwwrBg13GmfiD17

I recently acquired a late serial R4C with no mods applied.? There was quite a bit of noise in the audio with a dummy load attached and after reading everything I could find on the subject I figured

"Jim VE7RF via groups.io" <jim.thom@...> wrote: Yes, that is all correct. This is old tech that has been around since television sets became consumer commodities and they are robustly

##? The HV probe just arrived yesterday.? ?They stipulate? that if the return lead goes open, yes, you will end up with full B+ on the

Steve, I smelt no smoke and saw no burnt resistor. As far as I can see from the schematic only the following parts are used on 40 meters: L1, T3, C4 and C7 (inside T3), T8 and T10 - and of course the

Thanks Gary and Jim. On the radio working I don't remember having it up on those two bands before but I expect it did work. In cleaning the female connectors on the VCO board I used a GUM Proxabrush

Ah yes, a Molex issue. I knew I had seen that somewhere before but did not think to check Drakelist. Another thing to do is inspect the female connectors looking into the pin holes. If you see a large

Gary- About 50mA, keying in CW mode. In Tune mode, about 90-100mA. comcast.net_at_groups.io_lastradioman@...> wrote:

Do you get idle plate current when you key the radio? Gary W0DVN

It is worth asking, did the failure of your VCO board (displaying 51.950) occur on its own? That is to ask, did the radio work properly and then just fail or has it, as long as you have had it, always

Gary- Using an AC4-R supply. PA plate, plate, filament, dial light and bias voltages are getting to the T4XC. Dead driver or finals? comcast.net_at_groups.io_lastradioman@...> wrote:

Thanks Tom. I printed that off but hope that is not the problem. 73, Jim VE1RB [email protected]> wrote:

In 2010 there was a thread regarding the Drake TR-7 display showing 51950.0 on the old retired Drakelist. The thread is archived at https://www.mail-archive.com/drakelist@.../msg13119.html

Hi Guys I'm working on restoring a Drake RR2 receiver , however I don't have any manual which makes kind of hard. ?I have seen that somebody offered CD or DVD with many Drake user and service manuals