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In Reply to: RE: Another question about the cathode bypass capacitor posted by tyu on February 20, 2014 at 07:34:02:
Why it's a good thing: Banat told us. It puts a little local bias on the output tube and it eliminates the increase in output impedance associated with adding the cathode resistors, especially if you use the higher value cathode resistors that Banat favors.
The negatives: Banat admits that the audio goes through the shunt capacitor, inevitably, but with very minimal negative effects. Chris points out that the audio goes through the PS caps, anyway. My new question is whether the bypass cap in fact negates the capacity of the cathode resistor to promote current sharing under dynamic conditions, because AC current changes are shunted around the cathode resistor.
FWIW, I already said that I have the same finding as you: more PS capacitance gives better bass response. Chris's (and Ralph's) conception of the operation of the amp predicts that too. I don't think anyone is arguing about that at all.
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Follow Ups
- I had a new question for Banat - Lew 08:12:53 02/20/14 (0)
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