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Guitars, Gear, Tone!
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PostPosted: Mon, Mar 19, 2018 11:15am 
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Hack

Joined: Wed, Dec 06, 2017 3:51pm
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Hi,

I got some used tubes when I got my last amp.

Do you think they're still usable?
The silver coating is a quite a bit gone on the outer tubes, is that a problem?

Thanks very much!

slash57


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PostPosted: Sat, Mar 24, 2018 9:34pm 
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Immortal Rock God

Joined: Mon, Apr 07, 2008 9:49pm
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The tubes are fine. They coat the walls of the tubes with barium. When the getters are fired, barium reacts with oxygen to create the silver colour that you see. Uneven distribution of the barium reaction with remaining oxygen inside the tube is not indicative of any malfunction unless the barium is a bright white color, which means the tube does not have a vacuum pulled and is therefore faulty.

_________________
Amplifiers:
5150 II Head w/MM Iron
6505MH 20W

Guitars:
2012 Fender Select
1988 Charvel 475XL Special
2018 Gibson Les Paul Traditional
1999 Wolfgang Standard (Emerald Green)

Effects:
ADA 2FX
Lexicon PCM 81
TC Electronic 2240
Damage Control Timeline
Dunlop 535Q


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PostPosted: Sun, Apr 29, 2018 8:49am 
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Hack

Joined: Wed, Dec 06, 2017 3:51pm
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Thank you very much! :)
Sorry for the late reply, sometimes I didn't get a notification, and the topic did not show up for a long time


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PostPosted: Sun, Apr 29, 2018 8:57am 
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Hack

Joined: Wed, Dec 06, 2017 3:51pm
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Thank you very much for the reply!
Sorry for writing so late, I didn't get a notification :/


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