This is frustrating.
I've taken my replacement (brand new, from the package) caps out and recapped 3 times now and double checked my work each time. This radio only has 10 electrolytic capacitors. (4 in the biggest canister, 3 in the smaller canister and 3 other stand alone caps).
Hum persists in RX and TX.
Characteristics of RX hum:
- Hum starts a few seconds after the radio has been powered on. Around the same time as the meter slowly falls back down to its normal resting position to the full-on that happens upon power up.
- Hum is most prominent in RX when volume is turned most of the way down/all the way down. As the volume is turned up louder the hum gets drowned out by receive audio/static but it's definitely still there.
- Hum disappears as RF gain is turned most of the way/all the way down.
- Hum disappears as squelch is turned most of the way/all the way up.
Characteristics of TX hum:
- Always there, fairly loud background hum.
- TX audio otherwise sounds fantastic using a Turner +3 mic.
*** The RX/TX hum was present in this radio before I recapped it. It hasn't changed for better or worse, just the same. Radio otherwise works 100%.
I don't have a reliable way of testing the capacitors I purchased. They were all new in the package, not NOS. Tubes were all tested by a local CB shop (who unfortunately refuses to work on tube radio and amps anymore). Any tips on things I'm missing, or even better:
Anyone know anyone local to Houston that I could pay to check this thing out for me? I really have a thing for these radios and this one is in very nice condition, just want it working 100% so I can button it up and enjoy it.
Thanks.
