tom3 said:correction schematic: R6 is 150K and R4 is 270K.
Any ideas why the C3 is 470uf?(Cathode ).And why this cap is parallel with C2 (1nf)?
Gus said:The 470uf can "hold" the cathode voltage a little more stable than a lower value. This is a "taste" adjustment when you select the value. Think tube guitar amps with cathode or fixed bias output stages.
I find the film cap bypasses to be more of an "believed" improvement with new electrolytic caps(not years old ones).
I am looking for one of the data books I have that has an example of a bypass cap causing issues instead of helping. I forget if it was in an old AD or LT data book.
Circuit looks like a standard pentode wired as a triode plate out. Do you know what type laminations are in the transformer? Amorphous, Mu etc.
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