Really big powers of several kilowatts tend to use Valves still, You can get
surprisingly high powers from mosfets but they are still more fragile than
the old bottles from the abuse point of view. High powers using
semiconductors seems to mean devices parrarelled up and I just wonder what
happens to the others if one dies in such a stack?
Brian

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"Chris Holmes" wrote in message
...

One for Brian???

I was wondering back when men were men and Libby Purves worked on the
other
side of the mic, radio transmitters used valves.

Are there now solid state devices (big MOSFETs??) capable of producing the
necessary output power? Or are valves still used?

--
Chris