Over the years I've heard many people say that adequately cooling a transistor
is difficult because it is so small. It's really difficult for me to wrap my
brain around that statement though after playing with the 3cx400A7/3cx800A7
series tubes. If one were to take the anode cooler off the tube, they would
end up with a piece of ceramic about 1.4" in diameter and about .75" high.
This is on par with the size of these transistors. It seems to me the
dissipated power per area is roughly the same when looking at the devices minus
their coolers. What would be interesting is if a transistor manufacturer took
a page from the tube world and integrated similar cooling.
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