The PO50 is loaded with 5 12AX7 and 2 EL34 and delivery 45W in the HIGH mode and 20W in the LOW mode (variac mode).
The output transformer (TRUE COIL custom designed) is shaped around the old '70 Drake for delivery a full and complex tone.
In the LOW mode, the power supply is reconfigured for a B+ around 300VDC and the Bias is autoscaled.
The EL34 work always in pentode mode ensuring a granite and fast sound across all frequencies.