Yes, I'm aware that's said. But isn't it because the skin's grease (sweat) is acidic and micro etches the glass surface causing weaknesses?Originally Posted by Barry
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Yes, I'm aware that's said. But isn't it because the skin's grease (sweat) is acidic and micro etches the glass surface causing weaknesses?
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Well fingers crossed, I used the 'coke method' last night and also filed the pins with a nail file to clean them, and so far so good, my amp seems to be working fine now
Last edited by twotone; 02-11-2014 at 19:10.
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I think it is more a question of differential expansion of the glass: the fingerprints create 'cold spots'. However this faliure mode is extremely rare, to the point that it is not usually mentioned, just as it is not neccessarily suggested you handle incandescent tungsten light bulbs with gloved hands.
Halogen bulbs as used in car headlights and projectors run at much higher temperatures. These should not be handled with bare fingers.
My take on it all is that good quality audio valves are very expensive these days, so it is best to handle them using lint-free gloves.
Barry
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If this works it's my good idea, if not ,I got it from one of the American forums, get a pencil with a rubber on the end and use the rubber to clean the pins,apparently it works very well.Never tried it myself tho'
Nothin' I do don't seem to work ,it only seems to make matters worse!. Jagger/Richards
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ps ,it may be a bad idea to use a nail file as it may leave rough spots on the surfaces which may cause "micro " arc spots between the two surfaces ,leading to further cleaning being necessary and so on [possibly eventually leading to valve or valvebase needing to be replaced].Proper ray of sunshine are'nt I.-just something to keep an eye on. regards Mick
Nothin' I do don't seem to work ,it only seems to make matters worse!. Jagger/Richards
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When I read it,Ithought the "poster" had something a bit different up HIS nose
Nothin' I do don't seem to work ,it only seems to make matters worse!. Jagger/Richards
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Not a valve user at present but was for a long time and my preference was a good rub with duraglit then clean cloth to burnish and finish with a good wipe round them with Kontak and then a quick check with the meter for the bias settings and sit back and enjoy !
Life long music lover and Hi-Fi enthusiast for over 40 years, avid live music supporter, dismayed by the current dynamic ticket pricing applied to so many events !!
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Please don't use a file, try one of these.
http://www.ebay.co.uk/itm/Scratch-br...3D281178279715
Frank...made me do it.
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Excellent suggestion!
Barry
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