I've had two answers on this and I now see what the problem is.!!!
There seems to have been numerous amps , using a pair of 572B's (various
mfrs.) None of these were perfect, BUT , some better than others.
I've repaired some of these amps, mostly SB 200's , and with a little
"modern" application of parts, etc, most have worked quite well.!!!
However: The Heathkits mostly didn't have the 160 band, so I keep wondering
about it.!!!
But I think the biggest problem is the HF end ( as in 10meters).!!!
Seems to me there were always those who could "invent" new mistakes in
these amps.!!!
Let's go back to the "almost perfect amp" , modify it for a pair of
572B's and see if we can improve the designs.!!
Only one person I know of can do this job, and I think all on this list
know who that is .!!!!
I'm already working on one amp of this type, but I'm
so old and so slow I may never get to it before I go to my "great reward"
, so I'm hoping someone can give me
a boost.!!!! Yak Yak >!!!!!
Thanks to all.!!!
carl / kz5ca
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