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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

Joe, although I do not own a 2-NT, the schematic shows R19 as a 15M potentiometer to adjust the delay. When fully CCW, the delay is et with a 100k to ground. If the pot is open near the full CCW end,

Thank you, great article...WD4AGG

Good day, Got the novice station online and having some fun with 2C, 2NT, 2BQ, and HA5 VFO. Everything is running great including muting and spotting, but wanted to ask about the T/R delay. At full

A couple of comments: The getter in receiving tubes (including TV sweep tubes) should be silvery, when it starts to be worn it becomes sort of white or cloudy. Heavily used tubes may show this around

This reminds me of a similar problem I had with my KWM-2. Very high impedance in the T/R circuit. It would take a second or two to go back into receive. Problem was a leaky capacitor. My Heathkit cap

Hello list members I’m in the San Diego area and would like to know if Is this the correct list for help or finding someone to work on a Drake UV3 tri band radio? Thank you Bob Kd6gnb

If the Richard you mean is me I don't have the answer but I have had problems with gassy tubes affecting the AVC. In may case the slow AVC was too fast. Gary Barrell told me it was probably a gassy

By the way the Antique Radios website has an interesting forum going on on this very subject

sounds like some good sleuthing there Sherlock! I am interjecting here from experience about heater to cathode leakage. This sounds like what may be happening here. Few tube testers have this test and