Quote:
Originally Posted by Tinker1966
Wow thanks Station X -
Car battery - I have several of those hanging about.
So connect that to the filament terminals and measure the other 2 with the voltmeter to see if there's any voltage .....
That's tomorrows project sorted
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Not quite, there won't be any voltage, you have to apply some and measure the current.
I'm just wondering how low a voltage you could use, and see some current and diode effect on a multimeter? Would a 9V battery be too low? Would -9v from a second battery be expected to cut the valve off or at least reduce the current?
More a classroom demo than meaningful testing, but it would prove there was some vacuum and emission.
(posts crossed)