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Once you get the rectifiers disconnected and the associated bleeder resistors downstream, the 100 watt light bulb test becomes very usable to test the transformer. Now it should be easy to get the filaments to light, through the resistance of the light bulb filament. Although honestly, at this point I'd just put a 4 amp fuse in it and plug it in. If the transformer is good, the tubes will light. If not the fuse will blow.