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 Post subject: tube question
PostPosted: Mon Sep 19, 2016 7:14 am 
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Joined: Mon Jul 03, 2006 12:17 pm
Posts: 187
Location: BURNABY, BC, CA
hi I have a few 2a3 tubes that test good on my tube tester but the heaters on the top don't light up. my question is will they be ok to run in my amp? any feedback will be appreciated thks


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 Post subject: Re: tube question
PostPosted: Mon Sep 19, 2016 8:37 am 
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Joined: Wed Jul 23, 2008 5:04 pm
Posts: 1652
Location: saskatoon, SK, CA
Tester out of calibration? Weak filament voltage?

I'd trust the amp before the tester.


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 Post subject: Re: tube question
PostPosted: Thu Nov 10, 2016 7:20 pm 
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Joined: Tue Jun 17, 2008 7:28 pm
Posts: 34
Location: London, ON, CA
I have a bunch of Valve Art 2A3s that don't have very bright heaters. They're barely visible when the lights are on. They are after all called dull emitters as are 300Bs and 45s.


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 Post subject: Re: tube question
PostPosted: Sat Dec 03, 2016 10:46 am 
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Joined: Sun Dec 04, 2005 3:16 pm
Posts: 1034
Location: Georgetown, ON, CA
Hi lightning,
The amount of glow out the top has more to do with the heaters extending beyond the plate structure and isn't a sign of quality at all. I'd say your tubes are probably fine.

What tube tester are you using?

-Chris


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 Post subject: Re: tube question
PostPosted: Sat Dec 03, 2016 2:33 pm 
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Joined: Sat Dec 28, 2013 9:17 pm
Posts: 351
Location: Delta, BC, CA
I wonder if the tester is sending the right volts to the heater..only 2.5 I think.


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