"Patrick Turner" wrote in message
...


: Transmitter tubes sometimes have an anode which is external,
: and specially made with a copper heat exchanger, and such tubes are
: not much bigger than a KT88, but they can dissipate hundreds of watts
: with a suitable blower,
: which forces a lot of air through the anode heat exchanger fins.
: 500w of power output isn't to hard to arrange, but for continuous
: 500w, you'd need 750w for heat dissipation for class AB.
:
: They are not much good with hifi amps, because the fans are noisy.
:
: Mounting such tubes in tanks full of oil might provide the answer to
: noise.
: The audio use of such tubes does not involve bulky
: RF coils which need to be close to the tubes, so the tube pack
: can be a separate module unit with OPT and input driver amp
: mounted conventionally,
: but with an oil pump and
: passive heat exchanger, perhaps like the radiator on the back of a
: fridge.
:
: Its all a lot messier than using a bunch of transistors, or mosfets,
: and a large finned heatsink, or simply using more conventional tubes.
:
: Patrick Turner.

Hehe, you should see what people build just to get rid of a 'lousy'
70 Watts from their microprocessor
Rudy: