Xin Zhi Zhao Schematic Top _hot_ -

If you manage to locate an original PDF of the schematic, pay close attention to the (usually a 47k anode resistor on the 845's plate for the driver). Replicate that, and you will have an amplifier that sings for decades. Without it, you just have a hot chassis.

: This allows users to trace components on the PCB, identifying exact connections and potential short circuits. xin zhi zhao schematic top