I forgot something important. How looks your power amplifier final stage ?
I have doubts you can't measure there the output current by simply
measuring the potential on protective resistors ( in emiters of both
final transistors ) one for positive alternation and the other on negative
alternation. Thus you'll be able to find the real current and knowing the
output voltage you'll find the output power ( if that's you need ).

Cheers, Vasile

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