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John beat me to it on the AC line to the speaker plug. That's what it is: there'd be a jumper in the plug to keep you from frying the tubes without the load of the speaker connected. The push-pull output transformer was on the speaker, too, and the screen line runs over there to it. Maybe studying some other push-pull output circuits would help to get a handle on it.
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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