Gang -
When assembling the KPA-100, is it permissible to use standard
zinc-oxide filled heat sink grease and mica insulating washers in place
of the supplied silicon-rubber washers? It seems to me that the grease
option wouldn't require re-torquing because any "flow" would happen
immediately when the transistors are snugged down to the heat sink.
I've got lots of mica washers for TO220 size transistors that would seem
to be about the right size. I might need to do a bit of trimming for a
better fit, but I've got lots of them. Many times TO220's are used on a
PCB just standing up in air, thus the leftover mounting hardware.
Yes, the grease can be a bit messy, but I've been using it for years
(with other projects of course), and never had a failure. You don't
need much per applications, either. A 5-ounce tube of Dow-Corning 340
purchased 20 years ago is still more than half full, even after lots of
home-brew projects.
What say all?
- Jim, KL7CC
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