Preamp ideas for F5

[juma]

Exactly. As EUVL wrote, BC549C/559C are OK since we deal here with Vce max. of 18 V

 

[EUVL]

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