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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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1st Sep 2014, 9:14 am | #1 |
Octode
Join Date: Dec 2006
Location: Colchester, Essex, UK.
Posts: 1,076
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Loose Valve Cap
Can I use a dab super glue or hide glue to secure a top cap on a 6V6 valve that is slightly loose ?
Mike. |
1st Sep 2014, 9:47 am | #2 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: Loose Valve Cap
A 6V6 with a top cap? Errrrr.........
Andy |
1st Sep 2014, 9:55 am | #3 |
Octode
Join Date: Dec 2006
Location: Colchester, Essex, UK.
Posts: 1,076
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Re: Loose Valve Cap
6C6 (typo !!)
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1st Sep 2014, 9:57 am | #4 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Loose Valve Cap
I've always used Araldite Precision for this. I understand that super glue can cause the glass to crack when it heats up.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
1st Sep 2014, 9:58 am | #5 |
Pentode
Join Date: Jan 2014
Location: Alton, Hampshire, UK.
Posts: 170
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Re: Loose Valve Cap
Probably not as I have never seen a 6V6 with one, I do use superglue to lock top caps on valves which have them, with no problems so far, but others council against as apparently there can be thermal stress problems on hot running valves.
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1st Sep 2014, 9:59 am | #6 |
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,681
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Re: Loose Valve Cap
I'd avoid super glue, if I were you. As I understand the issue, when it sets, it shrinks slightly, and bonds so strongly to glass that the shrinkage cracks the glass. I don't know how risky this is with the thin glass of a valve, but I wouldn't chance it. Other, softer adhesives (and hide glue may be one of them, but I don't know) will be safer.
Chris
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1st Sep 2014, 11:17 am | #7 |
Octode
Join Date: May 2010
Location: Worcestershire, UK.
Posts: 1,880
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Re: Loose Valve Cap
What was originally used?
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1st Sep 2014, 11:25 am | #8 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Loose Valve Cap
I don't know, but I'm sure if you search the forums with suitable search terms you'll find out.
https://www.vintage-radio.net/forum/...ad.php?t=57584
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
1st Sep 2014, 12:20 pm | #9 |
Heptode
Join Date: Jul 2008
Location: Selby, North Yorkshire, UK.
Posts: 979
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Re: Loose Valve Cap
There is another formulation of cyanoacrylate (ie superglue) designed for use on glass. It's used for attaching rear view mirrors to windscreens for example. You can get it in motor factors (eg Halfords), but I suspect most DIY places would have it too. I've used it to repair a broken level gauge tube on an oil tank, which was still intact after several summers and winters where it must have cycled through a reasonable temperature range. That was about 0.5mm glass, so probably not too different to a valve top cap.
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1st Sep 2014, 12:26 pm | #10 |
Heptode
Join Date: Oct 2009
Location: Melbourne Australia
Posts: 901
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Re: Loose Valve Cap
I've found that RTV or industrial grade silicone rubber (with temp rating to circa 200C) is great for loose top caps and Bakelite bases.
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