Quote:
Originally Posted by Electronic M
So ...
Before I verify my work I need to hunt down an issue where after 15 minutes the audio gets distorted.
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Surely you have considered grid emission of the output tube? However... that is usually with tubes in radios which have a very high filament voltage, like a 50C5 etc. But not unheard of with other "output" tubes.
Hope you "Gitter Going".