rockola 52280-a amp transistors??

The amplifier in my rockola 480 has lost the right channel...I've found Q11 and Q12 transistors are grounded on both the emitter and collector. The parts guide just describes then as "power tab (npn) red" and "power tab (pnp) green". I'm trying to source some replacements but have no idea what i'm looking for. The rockola part numbers are printed on them so they are no help..anyone know the specs i should be looking for? I'm going to do a complete rebuild but these two are throwing me for a loop, any ideas?