[hpsdr] Munin - Heat Spreader under Final Transistors...

[n3evl]

I'm nearing completion of my Munin amp and recall reading some postings 
about the possible need for a copper heat spreader between the bottom of 
the finals and the aluminum heat sink.  My question is - how essential 
is it to place something here?

I have some sheet copper in my junk box that is ~1mm thick so I could 
cut a piece to sit under the finals and attach it to the heat sink if it 
is thought to be necessary.  Maybe this sheet stock is too thin to make 
much difference.

Any thoughts/ideas appreciated.

73, Pete, N3EVL