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Old 15th April 2019, 10:32 PM   #1
cobretti is offline cobretti  United States
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Default EL34

I have just got brand new JJ EL34 matched pair for my Marshall 50W (clone) and since I am a solid state guy and have no experience with tubes I would like to ask here. When 6.3VAC is applied to heaters, one of the tube rattles like a rattlesnake. Does it mean there is something loose inside the tube and hence the mechanical noise? Should I get a new pair or live with it?
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Old 15th April 2019, 10:57 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by cobretti View Post
When 6.3VAC is applied to heaters, one of the tube rattles like a rattlesnake.
Should I get a new pair or live with it?
They may work ok, but I still would ask to exchange them for another pair.
This is not normal.
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Old 16th April 2019, 12:05 AM   #3
Enzo is offline Enzo  United States
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Nothing should rattle in a tube. HAve them replace the tubes.
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Old 16th April 2019, 10:03 AM   #4
DF96 is offline DF96  England
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EL34 can sometimes click a bit as they heat up or cool down, but should be silent during normal use.
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Old 16th April 2019, 10:16 AM   #5
samhill is offline samhill  United States
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I have on occasion found a little chip of glass rattling around inside. Don't recall if it was pulls, NOS, or new that I could return but I just let those be figuring no big deal. If new you should return them just to force quality control higher.
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Old 18th April 2019, 11:06 PM   #6
cobretti is offline cobretti  United States
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OK, thanks. Good to know. I sent them for replacement. Meanwhile I ordered another pair of EL34, Mullard this time. They feel and look more solid to me. Dead quiet and seem more rugged. I was also looking on different tube manufacturers like Svetlana or Tung Sol but they have a little different internal construction. I don't like that top and bottom isolating spacer. The whole construction seems to float in the space, unlike the Mullard has both spacers leaning on the glass and holding it nicely in position.
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