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Originally Posted by radio nut
Well primary is powering the rectifier only,..
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Does that mean only the 6X5's heater is lit, and the other tubes' heaters are not lit? Or what?
Quote:
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...secondary shows as open.
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Presumably you mean the HV secondary which connects to the plates (pins 3 and 5) of the 6X5. Have you measured between pins 3 and 5? It should be a few hundred ohms. The winding is center-tapped, so it should measure half that value from either plate to the CT**.
**Half the winding will show a slightly higher resistance than the other half. That's because the winding is layered, and the outer layers have larger radius (more wire per turn).