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Definitely it's producing 120 watts

Because they are running 480v on the plates and 475v on the screens and the cathodes are grounded directly and the amp runs into AB2. Of course the 120 watts is coming at a much higher distortion but it does make 120 watts on measurement. I tested one of these amps four years ago as I was also shocked at the numbers but they make it.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken



Edits: 05/28/16

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