If you have a concern, ask the seller that you will buy it on the condition that a reputable tech gives it a clean bill of health. I would offer to pay for the test.
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How much are you paying for it ?
They were impressively well made, I had one may years ago, sounded very good too.
If you don't have any measuring equipment, the easiest way to test it is by shorting the inputs with a RCA shorting plug, mount a 8 Ohm resistor over the speakers terminals and turn it on. Assuming that it stays on, let it sit for a few minutes then feel the resistors to make sure they have not heated up, if they stay cool you can hook up your system.
8 Ohm Resistor
The RCA Shorting plugs you can make from one of the presumably many pair of cheap wires you got with electronics over the years, cut off the plugs about 1" from the connector, strip the wire and twist the inner conductor together with the shield wire.
Best of luck