I've got this solid state National amp, but no idea what the minimum speaker load rating would be. It's not very loud into an 8 ohm cabinet, but I know that germanium amps tend to have low output power. I read that the 920P came with a six ohm cabinet, but don't know if that applies in any way.
With its single +34V supply the amp might give something like 15W into 8R.
A 4 Ohm load theoretically would almost double power, but also transistor and PT currents.
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