Okay this appears to be a GT65 or GT212 type model. So in this case I believe that the GT65 is 65 watt model and GT212 is 120watt model. So here is the GT65 schematic as I am pretty sure it is the same one that you will refer to on the GT212.
Is this the amp in this manual? Of course it says GT212 instead of GT65... Manual (for clarity) and schematic attached.
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