[Elecraft] OT: new SS amps

[Don Wilhelm]

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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