Dale Parfitt wrote:
"John Smith" wrote in message
...
I have gotten back into SWL'ing lately ... (ain't like it used to be
either!)

Got a couple of old Hallicrafter receiver rigs and replaced the front end
tubes with some GaAs semi circuits, done on a pcb board and serves as a
direct replacement for the tubes--except for the need of filament current,
they are "work-a-likes" ... gawd, bet those old boys wish they would've
have had those when they engineered the rigs ... I just love the look of
these old "solid" rigs! (solid as in "weighs a ton!)

I am interested in anyone else who has "tweaked" old rigs with various
"kludges" and gotten good results? Comments? Advise? Construction?
Results? Ideas? Unique construction? Anything? ...

Now, this post might NOT be "right on topic" for antennas, but darn close,
we DO have to consider what our antennas feed, right?

Warm regards,
JS

Hi John,
You might want to post in the boatanchors group or the shortwave group
also.
I well recall collecting "tubistors" at Dayton some years back for a friend
who wanted them for his S line. They were plug in replacements for the
tubes.

Dale W4OP

Wes Hayward had a picture of a KWM-2 partly protruding from a bin
labeled "Old Junk". I believe he included it in his _Solid State Design
for the Radio Amateur_. The explanation is that it had been modified by
replacing well designed, high dynamic range tube circuits with much
poorer solid state circuits by someone who didn't understand the
principles of high dynamic range circuit and receiver design. The result
was a receiver with very poor intercept values and consequent severe
problems with intermod and other spurious responses. The well-meaning
modifier had turned a very good receiver into Old Junk.

Roy Lewallen, W7EL