Quote:
Originally Posted by Malcolm G6ANZ
Just a thought, are 'normal' 6.3v heater valves more robust? I'm thinking of the EXX3x series and the more modern eXX8x (read ECH34 or ECL80)
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Yes - very much so. You'll be very hard pressed to burn out a 6.3V filament accidentally. Only likely scenario is a metallised valve that you can't see through, on a valve tester set to a massively wrong heater voltage. Anything else - you'll see the problem before anything catastrophic happens.