[Amps] Heat spreader for solid-state amps

[Duane B]

Hello everyone,

Is there such a thing as having to thick of a heat spreader?  I have 
access to two pieces of copper bar stock plates.  Both are 6" x8", but 
one is 3/8" thick and the other is 1/2" thick.  Oh, by the way, I'll be 
building the 600 Watt SS Amp, EB104.  Communication Concepts Inc, sells 
a 6" x8" x 3/8" one, but would the 1/2" be any better?

Thanks for your comments.

73's
Duane
W5DMB