In message , Tim Wescott
writes
wrote:
Look at RF transistors from the surplus houses if you want to save
bucks. Up to 10MHz or so you can use MOSFETs designed for SMPS service
if you're careful with the gate drive circuit, and they'll be dirt cheap.

Lots of examples of IRF520 MOSFETS and similar in HF output stages and
amplifiers out there, monitors also tend to have nice stuff like HV
caps, ferrites and as another poster mentioned, the video circuitry on
the tube base (often) has some nice transistors that will work up to
VHF.
Brand spanking new transistors that'll handle a few watts at HF are a
couple of bucks each, you can get up to 10W out affordably -- why do
you want to muck around parting out consumer electronics of uncertain
provenance?

Spirit of experimentation? I thought homebrew was all about that,
nothing like being able to tell a contact that the TX was built out of
scrap you got for free.
--
Clint Sharp