D. v. Bilt wrote:

It just crossed my mind. If a mosfet used in switch mode should or
could a thyristor also work. Do manufacturers make them already
for high frequencies ?

I've done it in the past, but they're not really capable of high frequencies
(mine was at 173 kHz).

Because a power mosfet is far too expensive to hobby around with.

What? The IRF730 (for example) is capable of 50 Watts at up to 25 MHz for
very little drive, and costs under $1!

Bob