Use the 2 ohm resistor but watch it's temperature so it doesn't burn out.
Disconnect everything from the amp and connect the 2.2 ohm resistor between the B+ wire of the supply and the red wire on the amp.
Connect the power supply ground (from the 12v power supply) to either the RCA shield or the small black wire (if it has one) that's connected to the secondary center tap of the transformer. Dim the lights on the work bench and twist the power transformer. It should intermittently draw current from the power supply. When it transitions from drawing current to not drawing current, you should be able to see a spark between the windings that are intermittently shorted. Keep twisting until you can pinpoint the area where it's shorted.
Disconnect everything from the amp and connect the 2.2 ohm resistor between the B+ wire of the supply and the red wire on the amp.
Connect the power supply ground (from the 12v power supply) to either the RCA shield or the small black wire (if it has one) that's connected to the secondary center tap of the transformer. Dim the lights on the work bench and twist the power transformer. It should intermittently draw current from the power supply. When it transitions from drawing current to not drawing current, you should be able to see a spark between the windings that are intermittently shorted. Keep twisting until you can pinpoint the area where it's shorted.
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