Hello everyone.
I have one accurate 151 tube tester, and im not sure if the "short test" works properly
When i test a valve ( even a new valve), a very smooth light shines on the indicator on most of the switch positions, but the light shines fully only when the selector is in the position marked as " disregard indicator lightning" in the manual . In some positions no light.
Is my tester broken? All my tubes must be discarded? When i do a test quality after, all have a "GOOD".
Thanks for helping and sorry for my english
Kind Regards
I have one accurate 151 tube tester, and im not sure if the "short test" works properly
When i test a valve ( even a new valve), a very smooth light shines on the indicator on most of the switch positions, but the light shines fully only when the selector is in the position marked as " disregard indicator lightning" in the manual . In some positions no light.
Is my tester broken? All my tubes must be discarded? When i do a test quality after, all have a "GOOD".
Thanks for helping and sorry for my english
Kind Regards
This tester is an old timer. I don't think all your tubes are bad. I do think your tester may need some maintenance. If the short light glows dimly on a "known to be good" tube, you are probably seeing leakage. This can be caused by faulty calibration due to age from resistors or adjustments that have changed. It can also be caused by contaminates like moisture (humidity) and dirt getting inside on the switches and sockets. Most testers are set to a one megohm threshold for leakage indications. Consult your manual for calibration procedures. Perhaps remove the tester from the case and examine the inside for signs of contamination and clean as necessary.
Many emission testers have a capacitor in the leakage test circuit that will cause false "short" readings if it's leaky. And if that capacitor is original, there's a very good chance it's leaky.
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