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 Cement the glass envelope of a octal tube to his socket

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edo61it



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Join date : 2010-10-13
Age : 56
Location : Italy - Naples - San Giorgio a Cremano

PostSubject: Cement the glass envelope of a octal tube to his socket   Tue Oct 19, 2010 11:46 am

Hi.
I have an OD3/VR150 that work just fine, but with the key of the octal socket broken, and so I would want to replace him whit a new socket.

Anyone know which glue was used in the past for cement the glass envelope of a tube to his socket ?


Any suggestion would be much appreciated.
Thanks.

Edo
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JG Jackson

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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Tue Oct 19, 2010 12:08 pm

Rather than replacing the entire base - it may be easier to cut a base off a dud tube, grind it down flat and fit it over the broken one....





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MikeBrown

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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Tue Oct 19, 2010 6:39 pm

AES used to sell thingies to do exactly that. Although I recall the cost was a bit prohibitive. You would really want to have to save that tube!
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Chas

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Location : S. Dartmouth MA 02748-1225 ------------ Avatar: Uncle Tony's Shack

PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Tue Oct 19, 2010 9:36 pm

Quote :
Rather than replacing the entire base - it may be easier to cut a base off a dud tube, grind it down flat and fit it over the broken one....

What a brilliant idea!
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glasdave

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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Tue Oct 19, 2010 9:41 pm

I like it...!
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edo61it



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Location : Italy - Naples - San Giorgio a Cremano

PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Wed Oct 20, 2010 12:17 am

JG Jackson wrote:
Rather than replacing the entire base - it may be easier to cut a base off a dud tube, grind it down flat and fit it over the broken one....

This damage of the socket is identical to mine ...









Wooow .... this is an amazing idea ..... really.



MikeBrown wrote:
AES used to sell thingies ....

Yes Mike, I found it, package of 4 for 10$ plus shipping Shocked


I thought, rather than to epoxy glue, to high temperature red silicone sealant for cement the glass envelope to new socket.

It could be a good idea ?
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Johnnysan



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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Wed Oct 20, 2010 12:26 am

I think the shipping to Italy might be a killer. If you can get it, I recommend JBWeld (if you still have the key to the tube). If you don't have the key, I would suggest you break one off a dud tube.
PS, let JBWeld sit for one day while curing.
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marcc

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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Wed Oct 20, 2010 2:16 am

I have used two part high strength epoxy resin, glass to base, on 5Y3's. One is still holding after 30 years.

The voltage regulator will not get that hot and there is not much stress on the spigot if its lifted carefully. It is best to prise the tube up from its base (screwdriver / puller) if its stuborn rather than pull on the glass.

Marc
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JG Jackson

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PostSubject: Re: Cement the glass envelope of a octal tube to his socket   Wed Oct 20, 2010 6:28 am

MikeBrown wrote:
AES used to sell thingies to do exactly that. Although I recall the cost was a bit prohibitive.......
Exactly - and I'm a cheapskate in need with a sack of dud tubes at my disposal.... albino


Edo61it.... there's been quite a bit of debate about gluing bases on this forum. With certain tubes that get very hot during use - there's the possibility (however remote) that physical characteristics (heat expansion) of the glue and the glass may differ enough to cause the glass to crack and ruin the tube - also, many glues simply will not hold up at the operating temperatures some tubes reach. The original cement was apparently formulated to alleviate this. Experiment with different adhesives - keeping in mind the operating temperature of the tube. Some have recommend furnace cement as a substitute.
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