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ms660 · 14th Oct 2019, 12:15 pm

Measuring the heater voltage was valid because in one instance in the OP's measurements no voltage was recorded across one of the UCH21's heaters (post#93)

As a fault example a short circuit across one of the heaters (due to whatever reason) would not give a voltage indication across that heater and would give a higher voltage indication than expected across the other heaters.

Lawrence.

14th Oct 2019, 12:15 pm	#111
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Philips BX281U20 valve radio Measuring the heater voltage was valid because in one instance in the OP's measurements no voltage was recorded across one of the UCH21's heaters (post#93) As a fault example a short circuit across one of the heaters (due to whatever reason) would not give a voltage indication across that heater and would give a higher voltage indication than expected across the other heaters. Lawrence.