That is why many hams built their own amplifiers back then - a pair of
813s could be obtained for $25 or less back then and there were surplus
transformers available at a reasonable cost. There were several "pair
of 813s in Grounded Grid" circuits published back then, followed by the
'pair of 572Bs in GG' designs.
BTW - they work just fine today if one can find one of those old
homebrew amplifiers - but they are usually large and built on rack mount
chassis, some used plug-in coils while others used a PI-network output
circuit. Yes, they had to be tuned to resonance and loaded to the
correct plate current draw, but that is not much different than
adjusting a manual ATU in today's world - we just moved the tuning
mechanism outside the amplifier.
"No Tune" amplifiers are not new - Centronics had one available back in
the 1960s.
73,
Don W3FPR
WILLIS COOKE wrote:
Sandy, did you ever take a look at what a kilowatt amp cost in 1955? It would
be more than than $3,000 when $3,000 was a year's pay for most.
Willis 'Cookie' Cooke
K5EWJ
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