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Sure, I understand. What I typically do is pull the 5U4 rectifier tube for the first power up. That will kill B+ to the entire set and only the filaments get power. Then I put my DMM in AC mode and probe the 5U4 socket. Should have around 5 VAC for the filament and 700-800 between the plates. That's a quick way to see if the power transformer is any good without risking damaging anything.
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