According to the discussion linked below, BC327/337 has lower noise than 550/560 (or 549/559).
Where have all the Low Noise Transistors Gone?
So one can decide what to use for the input pair -- lower noise or higher hfe (lower base current).
If one can match hfe for the input pair, then their base current cancels.
So I know what I would choose.
Cheers,
Patrick
Where have all the Low Noise Transistors Gone?
So one can decide what to use for the input pair -- lower noise or higher hfe (lower base current).
If one can match hfe for the input pair, then their base current cancels.
So I know what I would choose.
Cheers,
Patrick