Does this circuit work in a ciclotron or a OTL amplifier ?
I haven’t tested it thoroughly. You will need two boards and modify each to handle half the voltage, which in case of a 170 bipolar power supply, you will have to bypass zener diodes 3,4,5 maybe even Z2 . In case of the OTL, one board will be insterted in the circuit the other way around in the case of the negative supply. It will depend on the design and characteristic of your certain amp to see how it handles the curent. Maybe a pop will be heard through the speakers. It is unlikely to find a vintage home amplifier to have such topologies.