[Drake] TR7 Parasitic PA

[Darrel Nichols]

Anybody ever encountered this?   First thought it was an RF feedback =
problem,
but oscillates just below 10 MHZ and hangs on when you pull the cable =
from
the up-converter.   Have full output so have trouble thinking the finals =
could be
at fault.  Caps check ok and bias is good.   Only happens on 40M. =20

Also see a back wave on CW on this band.   Is that a clue for anybody?

See several references on the net on replacing finals in the 7....Do =
they do strange
things on their way down the drain or just poop out in your experience?

N0DBX


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