RGD record player P10

[Mark Hennessy]

You're right to not just swap them without looking for why they failed. There's a chance that the biasing mechanism is allowing the transistors to conduct too much - perhaps a dirty contact on the quiescent current adjustment preset? Hard to say without a schematic, but you might end up having to reverse-engineer the schematic from the unit. Given some good photos, we might be able to help...