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

Thanks Al, for your wisdom. I will make sure I follow the guide lines provided by you, Kijanki, and Dave.

From many I have talked to, most agree to use bypass caps as close to the amplifier end as possible to filter out those ultra high freq noise in the hundreds of kHz into MHz. So can everyone agree on one sequence of capacitor values that makes sense? I'm not talking about bypass caps for ripple reduction across the power supply caps.

How about 0.01, 0.1, 1, and 10 microF?

Or even closer spacing?

Any chance of unwanted resonance creeping in using these series of values?

1/50 spacing 0.01, 0.47, and 22 microF also seems reasonable.

1/100 spacing 0.01, 1, 100 doesn't seem to reasonable because 100 microF film caps can get expensive.

I'm not sure why you need sequence of capacitors. It would make sense if you got fast and slower caps but your proposed caps vary only by value. I'm not even sure you need any caps. My vote, as I proposed before is just one cap of 1uF at the amplifier. Don't complicate it too much - just wire main caps with good heavy gauge wire and make sure amp is connected to the last cap since it is common mistake people make.