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Old 27th February 2013, 02:14 PM   #1
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Default testing tubes for shorts

came across this circut....looks simple enough. if one were to add mil=amp meeter connection points in series with the pilot lights.....would it allow to measure for leaks as well? any other diy circuts out there for shorts and leaks?
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Old 27th February 2013, 05:32 PM   #2
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6V will be too low to measure leak currents, as the leak resistances are usually still in the high k-ohm range...

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Old 27th February 2013, 06:12 PM   #3
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Inplace of pilot lamps, U can use neon lamps in series with a high value resistor and higher voltage outputs at transformer winding to see leakages. See the radiotron's book for some circuits and considerations.
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Old 27th February 2013, 11:20 PM   #4
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Ok, so maybe 180v and some of those neon bulbs
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Old 1st March 2013, 07:52 PM   #5
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Yes, that is a better idea. i did the same thing to. used it in my homebrew tube tester.

My circuit consists of A 230volt neon tube. whit a 100n capacitor in series shunted whit 4M7. fed off 205Vac..
the capacitor is to stop the tube from conducting current, acting as a half wave rectifier.

works really well. flickers under 2M resistance. and glows brightly under 500k.
already found tubes whit shorted grids.. cathode shorts and a lot more faults.

my tester has a test switch whit 10 positions 2-9 test leakage/shorts and position 10 test anode current

cheers.
V4lve
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