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Are you trying to test the tube or the TV chassis transformer? Generally, I pull the 5U4 and power up the TV. All the tube filaments should glow. Then, if you have a meter that can handle 1,000 volts AC, carefully place the probes into the 5U4 socket holes for pins 4 and 6. You should get something between 600 and 800 volts AC.
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