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Old 21st October 2010, 01:59 AM   #1
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Thumbs down Shorted EL34 ?

If a pentode (such as EL34) has shorted, can you tell this by measuring it cold with an ammeter ?
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Old 21st October 2010, 03:03 AM   #2
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if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short.
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Old 21st October 2010, 02:00 PM   #3
DF96 is offline DF96  England
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A resistance meter or continuity tester might be better than an ammeter. Some shorts might only develop when the valve is hot and the metal expands.
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Old 21st October 2010, 11:25 PM   #4
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Best to do it with a tube (valve) tester then ?
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