HiOK, and as for the test points that I suggested, they are the bare copper coils that show in the photos posted back a ways. You will need to either probe at the end of the coil or scrape off a patch of the clear insulation coating to get a good connection.
The voltage at the output of a correctly operating amplifier module is very close to zero once it has stabilized after switch-on.
If you examine the circuit schematic you will see that the coil is connected directly to the module output on pin 12.
Is it these coils as pictured, getting 22.2v from each one !.
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