Jimmy Stewart ... wrote:
On 26/01/2021 10:55, Jimmy Stewart ... wrote:
On 26/01/2021 09:24, 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?

can't beat an 807
or a 6js6c or two or 6146

There are still some good-sized vacuum tubes kicking about.

https://www.nutsvolts.com/magazine/a...e-21st-century

"The filament of this tube alone requires 23V at 500A €” thats almost
12 kW, or enough to power an average house."

Even their filament power is bigger than all of your
rigs put together.

And lots of copper pipe with cooling water running in it.

Paul