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On two different 621's that I've fixed, there have been faulty (broken) tube socket pins on the 6AV6 audio amplifier tube. I've been able to cut away the bad pin and insert a good one from another socket in both cases. Very strange that I saw this apparently obscure problem on two different sets for exactly the same tube. Maybe there was a manufacturing defect?
I've also noticed that on the 621, if the shield is missing from the 6AL5 FM detector, the sound is very unstable and has all kinds of problems.
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