[Amps] switching power supply for tube amplifier

[David Cutter]

Manfred

Thanks for that detailed explanation:  I like the way you use a sound card 
to help with getting the stability right.


>> without switching regulation a smaller output capacitance (smaller size 
>> and
>> weight) is needed as the guard band is very small compared to the 
>> triangular
>> dip when using an inductor
>
> Sorry, I didn't get this...

Say you have a simple, non-stabilised switcher; then, in a push pull or 
bridge design, a small guard band is needed between each side 
energising/de-energising transition to allow for storage effects, to prevent 
cross-conduction.  This guard band is "filled in" with the output 
capacitance.  This value of capacitance would be a lot smaller than needed 
in a stabilised design.  Of course it does nothing for input ripple.

David
G3UNA