I have measured the Hfe of Q9-Q10 that I have unmount from the PCB and I have found a big difference: 511 and 591 (Q11-Q12 are 543 both)! Do you think this could be the cause of that offset?
I have tryed to match my own BC560c, but I the result matching has not be good.
Could be the same using BC556-557-558c as replacement or is it a worse chosen?
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