Shorted EL34 ?

DonDiego · 21st October 2010, 12:59 AM

If a pentode (such as EL34) has shorted, can you tell this by measuring it cold with an ammeter ?

jerluwoo · 21st October 2010, 02:03 AM

if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short.

DF96 · 21st October 2010, 01:00 PM

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.

DonDiego · 21st October 2010, 10:25 PM

Best to do it with a tube (valve) tester then ?

21st October 2010, 12:59 AM	#1
DonDiego diyAudio Member Join Date: Oct 2010 Location: Sydney, Australia	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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21st October 2010, 02:03 AM	#2
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short.

21st October 2010, 01:00 PM	#3
DF96 diyAudio Member Join Date: May 2007	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.

21st October 2010, 10:25 PM	#4
DonDiego diyAudio Member Join Date: Oct 2010 Location: Sydney, Australia	Best to do it with a tube (valve) tester then ?