Super Electric Tube Amplifier power Transformer Pair model # 7650-N These are shown being Tested for Voltages with no load, So you'll have to do your own homework, But I believe the 255v of one leg of the secondary to the center tap with no load means it's probably a 275v TO 300V B+ transformer with a 6.3V Filament tap. That's shown at 6.8v with no load.... You decide what you see here.
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