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OTL, Output Transformerless Amplifier User Group.

schematic

You will find a schematic that is quite similar to your amp at the link below. The driver voltages will be nearly the same:

Cathodes of V1 about 0.3V
Plates of V2: about 175V
Cathodes of V4: about -65V
Plate of V4: about 275V

B+ and B- are about 300V

To get an idea of your power tubes take a look at this link

If your power tubes are good it may be that some of the resistors in the output section have failed. In your amp the larger resistors on the power tube sockets are 1 ohm 5 watts. Some earlier versions have 3 watt resistors.


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