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Old 27th February 2013, 02:14 PM   #1
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Join Date: Jul 2008
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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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
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.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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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

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