Quote:
Originally Posted by aechopan
I could not check the valve heaters continuity, because I am not sure how it is done
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Just treat them as resistors and measure between the relevant base pins (with the set disconnected from the mains, of course- unless you have a really good meter, they don't like trying to measure the resistance of the national grid!).
A check from chassis to point C in the circuit snippet in post #2 will check the whole chain in one go, including the dropper resistor, if that's not OK, you'll need to prod individual sections/valve heaters.