Both are a variation of the Vackar osc and transistor choice,
operating point and component quality make a difference. For that
VFO the 2SC1815 is a vastly better device than the 2sc372. I know
as becuase I have a ARS (Allied RadioShack) AX190 (ca1974) reciever
that I replaced all the 2sc372s in oscillators that had proved
drifty. Also a few caps were replaced with polystyrene as well and
the result was far better.
Allison
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