Also the tail pair can be mpsa92 matching them give's performance and lower's offset voltage..
the driver can be BD139.. also the current limiter transistors and components can be removed for pre-fight checks.. large offset voltages can happen if the tail transistor legs are fitted in the wrong way round when using different replacements.. make sure the legs are fitted the right way in...
I would agree about different ranges of offset voltages.. but these amps should be about 100mv or so.
o/p pair can even be 2n3773's etc etc..
these amps can be tested on supply rails as low as +- 15 volts to 47+- dc..