Roy Morris wrote:
I don't think the
mounting surface of the 2SC2879 is a part of the circuit because the
two mounting screws make contact between the transistor and heat sink
anyway. The thermal pads are only used for heat transfer and not for
circuit isolation. Am I right about this?
Yes.
Or are the two emitter
pads on the transistor connected internally to the mounting surface
of the 2SC2879? Before I put the shield back on I checked the bases
and collectors of Q1 and Q2 and they checked out fine. The amp works
just fine, but I am going to replace the thermal pads to be on the
safe side.
The pads may *look* like they are worn away, but they are probably not!
At least that was my experience. I replaced them, but when I removed
the old ones I was sorry that I had bothered -- they were actually fine.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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