Quote:
Originally Posted by maxhifi
The grey coating inside of tubes is RF shielding, it's used on power tubes which were designed to be used at RF frequencies. Some audio tubes like the 6V6GT have it because they were dual rates for RF use too.
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Wouldn't the coating have to be grounded then? I have never seen a ground connection to the paint on the inside of a glass 6V6... the metal versions *did* tie the metal shell to pin one so that it could be grounded, but the glass versions list pin one as "nc".
jr