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Ok to touch tube glass with fingers? (Read 1045 times)
Don W
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Ok to touch tube glass with fingers?
08/11/12 at 04:01:17
 
I have been using bare fingers to change out tubes but just read somewhere that oils from human hand will shorten the life of the tube. Is this correct?
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« Last Edit: 08/11/12 at 04:01:47 by Don W »  

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jameskk
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Re: Ok to touch tube glass with fingers?
Reply #1 - 08/11/12 at 11:49:55
 
if you watch the building of the zen amp , Steve Deckert puts the tubes in the unit with his bare hands .  i also do that ,but wipe them down once they are in the amp with a dry soft cloth. does it matter , who knows. A tube can last the time it takes to heat up.... to a 50 year life, ya just dont know unless you have a tube tester. Decware is real good with they're tube policy.
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Rivieraranch
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Re: Ok to touch tube glass with fingers?
Reply #2 - 08/11/12 at 13:05:34
 
I have a white tube glove, but rarely use it. How are you going to remember to put the glove on every little time you swap a valve?  The glass is impervious to the elements and the vacuum is inside. How a fingerprint could in any way affect that is beyond me.
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rmt
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NIbbelin NFX

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Re: Ok to touch tube glass with fingers?
Reply #3 - 08/17/12 at 21:07:28
 
I never use my bare hand to switch out tubes.   First reason is because I never wait for them to cool off so I don't want to get burned.  Second reason is because on the oddball chance that the tube breaks it won't cut my fingers.   I have had a tube break on me while handling but it was a cryoed one.  We need tube clamps.   Cheesy
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will
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Re: Ok to touch tube glass with fingers?
Reply #4 - 08/17/12 at 23:51:19
 
Good point rmt. I have never had one break in my hand so never thought of this.

I also use a rag to take them out a lot of the time as they are hot. Then I usually put them in with clean hands, but over time this shows, at least with tubes that get rolled a lot, the finger grease burning on to the tube. It seems to clean right off though for the most part as long as it does not go too far.

I guess if you have high dollar tubes you intend to trade at some point, it would be wise to use a cloth or glove every touch, and avoid those fragile NOS markings.
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rmcfee
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Re: Ok to touch tube glass with fingers?
Reply #5 - 08/22/12 at 04:38:48
 
With certain types of high temp bulbs it is an issue (oil from fingers that is) but vacuum tubes don't get hot enough to stress the glass from the oil. I think.
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