All,
I just picked up an sb-220 and it is not behaving 'properly'.
It draws about 100 ma of plate current with no input, just the relay
closed. Is this normal??
It behaves predictably up to about 20 watts of input. It develops about
20 to 1 gain from 1 watt in to about 20 watts in. At about 20 watts
input there does not appear to be any additional power out and both
plate and grid current rise sharply. Is this weak tubes or something else??
Thanks,
Dan
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