wrote:
In the vacuum tube world,
several types of TV line finals
are reused as HF PA FINALS.



- WHAT ABOUT CRT-TYPE PC MONITORS? -



Are there solid state components there
that could do say 5 to 30W (in) at HF?

Any other components
that would fit well
in a basic CW TX?



I'd be moderately surprised if that were not the case!

Hints, anyone?

Filippo
N1JPR/I2

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.

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?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

why do you
want to muck around parting out consumer electronics of uncertain
provenance?

curiosity and hack value, not much else!

there are good transmitter kits that are worth more than the effort
(and cost too) of ordering ones of each component

if you have some junk, though, it may be worth a thought :-)

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