Try using a small drop of Deoxit on the pins of all the tubes. I have
seen this type of static many times due to oxidation of pins and
sockets. A dead giveaway is if you get loud static if you wiggle the
tube top.
FWIW
Curt
Robert Ladden wrote:
I've had tubes generate static, but they were mixers. So it can be any
tube doing that. I would swap tubes out ONE at a time.
73,
Bob WW3QB
For about 20 minutes after being turned on, R-4A ehibits static
building from low to high volume over about 10 seconds, followed by a
"pop", then repeat. AGC setting and band selected makes no
difference. Happens with or without signal input. After about 20
minutes, the static goes away and the receiver performs normally. I'm
guessing this is a marginal tube in the audio chain?
73, Curt KB5JO
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