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Don't talk politics and don't throw stones. Your royal highnesses.
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The easiest way to find out is to buy one spare preamp valve - make sure it's a Chinese one (Shuguang, often sold under other brands eg TAD) since Russian-made valves and sometimes JJs can have a problem with failure in the V2 position since it's a cathode follower. Or any old-production Western-made valve will be fine.
Replace V2. If that doesn't fix it, put the original back and try the new valve in V1, then repeat for V3 if necessary. If that still doesn't fix it, it's most likely a tech job since a power valve problem wouldn't make the pots crackle, although it could do the other things.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I've got a spare 12AX7 somewhere- I think it's a Groove Tubes one that came out of my old Cornell. Those are Russian I think..
That would be fine for the diagnostic swapsies though, right? And if it fixes the problem swap in a new Chinese 12AX7?
Don't talk politics and don't throw stones. Your royal highnesses.
Chinese 12AX7s have a distinctive double chrome strip on both sides of the plate structure inside.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Thanks @ICBM and @DJH83004 !
Don't talk politics and don't throw stones. Your royal highnesses.