GM All:
Has anyone else had trouble getting a general purpose sub working in
the Q5 AM detector amp position?
I tried several close NTE GP subs and also a 3393 which is same
parameters ex Hfe which is slightly different.
The transistor comes on but with the grounded emitter, pulls the
collector voltage to near zero. As soon as I put in a "real" orignal
3394 from a R4A, it works as it should--good fidelity and collector
voltage at about 5V from the supply rail of 10V.
Is this design so sensitive to Hfe as to be marginal or need to be hand
selected? Certainly the 3393 is well within the spec range of the 3394.
Thanks
Curt
KU8L
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