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RE: 6V6 Amp Feedback

100K is the top limit of the 6L6GC spec, at least according to GE and RCA. That is the max for fixed bias so that wouldn't bother me at all. For cathode bias the limits are typically 500K.

There is no such thing as absolute safety, but I do believe you are getting the best odds when you stay at or below spec. Above spec some tubes will be fine, but some others will cause trouble. It seems to me that it is irresponsible to ask the amp owner/user to bear the risk of operating at too high a grid circuit resistance. So I recommend that the spec be adhered to.

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