In article , Chris Green
scribeth thus
Chris Holmes wrote:

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?

There are big semiconductor devices capable.

However old transmitters are expensive to convert to new devices. I
seem to remember that the Radio 4 transmitter on 198kHz is still a
valve and that they only have one more spare.

There aren't conversions as such, usually the old Valve transmitter is
scrapped and a new solid state one goes in its place..

Broadcast transmitters have a very long life the Droitwich long wave one
will be kept going until its switched off a decision that the BBC will
make..

Nothing to do with the valves plenty of re-builders in Russia and
China!..

And new ones are around still..

https://www.nautel.com/products/am-t...ers/nx-series/


https://thomsonbroadcast.tv/product/...nsmitter-s7hp-
neo/
--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.