Express Cathode Bypass 22uf vs 25uf

[jferris5]

I'm just curious has anyone used 25uf cathode bypass caps like in the A6 version of the express rather then 22uf? Would one expect to hear any difference between one or the other?

I have a few 25uf atoms laying around I was thinking about using for my express build rather then ordering 22uf.

Thanks,

James

[Turbojunkie]

I don't think the average person's ears would hear a discernible difference between 25uf and 22uf...the vast majority of amp builders generally cut the cap values by half and use the closest value cap to that... 25uf, 10uf, 4.7uf, 2.2uf, 1uf, 0.68uf...

Here's a link to Richard Kuehnel's very cool calculator for determining the effects of different cap values, as well as many additional calculators for other purposes...

https://www.ampbooks.com/mobile/amplifi ... capacitor/

And one for a free chapter from Merlin Blencowe (Valve Wizard) excellent book which has some detailed information about cathode bypass caps starting on page 25.

http://www.valvewizard.co.uk/Common_Gain_Stage.pdf

Hope it helps!
TurboJunkie