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David, I agree with Gary’s response. I liked your comments. 73, Bill KJ5BNE ++++++++++++++++ Bill Blodgett Arlington, Texas

Whoa David. Not sure what this refers to but I am pretty sure we all appreciate your insight and help. In fooling with broken old radios, nobody has an exact answer, we have to work around the problem

Yup, sometimes you gotta savor the victories! mike, wb8vge

Hi everyone, I wanted to update the progress on my SW4A problems with the AGC causing distortion with strong signals. Over the Christmas holiday, I installed the tri-section electrolytic capacitor I

Great Steve.? I love it when we find a solution and save an old Drake! Darn, I sure wish we could? go down to the store and buy a new tube.? I am suspicious of any tube now, they are all as old and

Richard, YES, you are da man.? I have learned a lot of valuable info from your posts, keep them coming! 73, Gary WB6OGD

Update: First, thank you all for the info and help. I took the DR7 out and cleaned it with deoxit. Especially the pins and contacts in the rear corner, that I knew were causing problems. That fixed

My first rig was a Swan 500. Shortly afterwards, my Elmer also sold me an R-4A that didn’t work. That was my first piece of Drake gear and I wish I’d kept it but I didn’t. I used a Johnson TR

Happy new year dear friends! Had some time to spend, the TR7 is now fixed. As Jim suggested, I could not find any obvious fault in the VCO board. I think the fault was due to the very tight boards

I missed a point about tubes. All tubes will drift when warming up. Simply the the spacing of the electrodes and their dimensions change with temperature. Most things expand when they get warm, so do

UPDATE One very bad tube (V5, I think. I should have marked them when I removed them!). Three that weren't great but had passed on the tube tester. V3, V4 and V9. There is still a change in voltage

well, it was not my intention to draw people from addressing the problem, but it appears that intended helpful comments based on nearly 60 years of radio repair experience was not taken as intended. I

That is a good place to start.? I will have to pull the tubes this weekend. TNX -73 de Chris KQ6UP

Because this has bitten me so recently, check to tubes for gas. Does the receiver behave normally for the first few minutes? 73, Steve Wedge, W1ES/4 Time flies like an arrow.? Fruit flies like a

And it's very welcome. Thanks. Regards Guillermo - LU5WE.

I was playing with my R-4C today, when after a few hours on he meter started reading slightly negative.? It went back after powering off, and even after turning it back on.? However, again after

That's a great reminder, thank you Joe ki5o

And, as always, look for bad solder joints or broken wires. Bob K9JU

Bob that is a great place to start. I had a bad potentiometer on the Q-multiplier that was a problem. I'll check it out. Any other thoughts are greatly appreciated Joe ki5o

*** Thanks from me too. I saved it. - Jerry, KF6VB