I would recommend the following transistors from Diodes Inc. for all stages preceding the output stage in an audio power amplifier:
ZTX653/753
ZTX658/558
ZTX696B/796A
Because of their very high beta, the last pair are excellent for use as clamping transistors in the SOA protection circuit.
Diodes Incorporated - Analog, Discrete, Logic, Mixed-Signal
ZTX653/753
ZTX658/558
ZTX696B/796A
Because of their very high beta, the last pair are excellent for use as clamping transistors in the SOA protection circuit.
Diodes Incorporated - Analog, Discrete, Logic, Mixed-Signal
There is an active thread on this site about transistor choices for audio amps that might have been a more useful place for this info.