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

Thinking back, one seldom heard terms like BDR or IP3 knocked around with
respect to amateur receivers of that day. Sensitivity and selectivity was
about it from an advertising standpoint. Amateurs were so determined to get
hold of the new solid state or hybrid gear, that Collins S lines and Drake 4
lines with better specs than the new gear could be had outrageously cheap.

Dale W4OP