[Elecraft] Decoupling circuit -- why is it like it is?

[Vic Rosenthal]

In the KPA100 the positive line to the transistors is bypassed by numerous
decoupling capacitors:  C52-C57, each of which is 0.047 uf, and a 470 uf
electrolytic.  My questions are:

1) Why six capacitors instead of one 0.3 uf capacitor?  Obviously these are to
remove RF from the +12 line, by why use more than one?  Is it due to RF current
ratings?

2) Why a large capacitor like 470 uf?  What does this one do?  Certainly it's
not for RF!

Why am I asking?  Well, there's nothing wrong with my KPA100.  But it is more
intelligenly designed than my high-power amp.  This unit has four boards like
the one in the KPA and puts out from 550w to a KW on various bands when it's
working.  It has only a 100 uf electrolytic in this location -- and it blows
these electrolytics like firecrackers on 15 meters!  I have tried 0.1 uf discs
across the electrolytics to no avail, but looking at Wayne and Eric's design I
see why!  I'm hoping someone can explain this aspect of the design to me so I
can understand how to fix it right (the manufacturer of the amp thinks I'm an
idiot and won't talk to me).

Vic K2VCO