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A rectifier is a component that converts the alternating current (AC) out of the transformer to direct current (DC).
The amplifier needs DC voltages to work.
Normally you use a multimeter.
In this case if you are using a 9 volt battery the positive is the smaller male connector (it's usually...
Depending on the type of rectifier the power supply uses, if it's a bridge rectifier, you could probably get away with removing the tranny and replacing it with batteries.
It shouldn't hurt it to try.
Alternatively, locate the rectifier and remove it and connect the batteries to the main +-...
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