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Wow Tony, I've seen some NOS flybacks that didn't look as good as the one you cleaned up. The wire stubs on the 5Y3 socket have red/green insulation which corresponds to the power transformer taps for the 5Y3 plates. I would be curious as to how the previous repairman dropped the B+ from the 5U4 level to the 5Y3 level. I'm still betting on a big power resistor.
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