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Pin 1 is ground on a metal 6L6, but on a glass one it is sometimes used as a tie point just like pin 6. Where is pin one connected to? If ground what you have is just a little network to stop the amplifier from oscillating. The 200pF rating sounds about right, it is not too critical, but what is critical is the voltage rating of this capacitor - it's got to be quite high, I would probably use a 1.5kV capacitor here, maybe higher, definitely not a little 400V capacitor.
Last edited by maxhifi; 01-28-2014 at 02:14 PM.
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