What value cap to bypass power supply cap?

Dave and Kijanki, your very nice words are much appreciated. Thanks!

Dracule, I don't have anything much to add to the excellent inputs Dave and Kijanki have been providing. I would just emphasize Kijanki's point that there is most likely no need to spend a lot of money on the 0.1 and/or 1.0 uf caps, given that your present high value caps are good quality film types, and that the role of the lower value caps would presumably just be to provide filtering up to perhaps the low MHz region, and to provide supplementary short-term energy storage.

Do be sure to check that the voltage rating ("WVDC," for working volts DC) and the operating temperature range of the caps you choose provide large margins relative to the requirements. In typical amplifier applications, I would think that in general the commonly seen 85 degrees C temperature rating should be avoided, in favor of something in the 100 to 125 deg C area. And I would choose a WVDC rating that is at least twice and preferably three or more times as much as the voltage that will be handled.

Best regards,
-- Al

I agree with Kijanki that using three or four different value caps seems like overkill. Admittedly we are going on instinct, because there are many variables and unknowns involved, relating to the design of the amp, the characteristics of the capacitors, and the characteristics of the incoming AC. And because issues involving noise tend not to have a great deal of predictability.

My vote would be for at most two values, either 0.1 uf or 1.0 uf or both.

Best regards,
-- Al