Quote:
Originally Posted by David G4EBT
With the meter set on the Ohms range and the set disconnected from the mains, with one test lead to the chassis (doesn't meter which one) and the other at the 250V tapping on the transformer, it should measure 210 Ohms. You'll need to have the valves removed to carry out that test, otherwise the series valve heaters would be in parallel with the transformer winding across points B & C. You'll see what I mean from the attached sketch. If by any chance it reads open circuit, the individual resistances of each tap are on the circuit data so you'd need to check to see where the break is.
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So with all valves removed and a quick clean up job on the auto-transformer tags I'm getting 199 Ohms at the 250V tap - as this is within 10% of 210 Ohms I'm assuming that's acceptable?
Next job is measuring the output transformer.