wobbly valve base

[ed]

Does anybody know a bone fide method of securing a wobbly valve base??
I was thinking of gloopy sooper glue but I'm not sure what it does under heat...

[simon]

Good question Ed, I've got a 45 and a 26 with loose bases I should glue up. Bet Steve S is an expert with all those antique valves of his...

[Andrew]

The old fashioned way is ground up marble, i.e marble dust mixed with shellac, I kid you not.....

cheers,

-- Andrew

[Greg]

Hi Ed,

Don't allow it to become too complicated. I've had good results with both Superglue and Epoxy Resin. My friend who has traded long time in second hand valves has used Superglue many times with no purchaser complaint. You will find threads going into the temperature issues etc. I consider this a 'Red Herring'. From experience and longevity of subsequent use, if the gap is small use Superglue. If it is wider, use Epoxy. Both will sort you out.

Best wishes,

Greg

[Darren]

We used to use Araldite on our motorbike engine cases after we fell off.

It stopped the oil coming out just fine. Seemed pretty permanent too.

But super glue on valves seems to work OK too.

[Toppsy]

Ed,

I would agree with Greg on this one having tried both methods on some old NOS military tubes.

[triodeconnected]

Don't use Superglue or Araldite. They can give off toxic fumes when hot.
Use Shellac.

[Toppsy]

Don't use Superglue or Araldite. They can give off toxic fumes when hot.

What evidence do you have to support this statement?

I can find no printed text related to using Cyanoacrylate glues giving off toxic fumes when hot! Indeed there are specialist CA glues purposely developed for use in hot conditions.

Sure they do give off fumes during the cure but if this concerns you then use ZAP ODORLESS. This does not give off toxic fumes.

In essence CA glues are a acrylic resin that polymerises during cure in the presence of water. So the final bond is acrylic. Are you saying that if we heat some acrylic sheet to allow it to be bent then this will give off toxic fumes?

Now dose not epoxy glue cure by giving off heat and the reason they don't go off in freezing cold conditions? I have not heard of epoxy resin glues giving off toxic fumes. But then I'm prepared to be enlightened by your knowledge.

Perhaps you could elaborate your statement.

[triodeconnected]

I tried to post some URLs but it won't let me.

[Toppsy]

OK.

I would appreciate you send me a PM with the links.
I'd be very interested in reading them. I use a lot of cyano and epoxy glues and this contradicts what I understand that cyano is NOT TOXIC.

Extract from the following URL:

http://www.bsiadhesives.com/Pages/hobby ... dex.html#6

Q: Is cyanoacrylate toxic, and does odorless CA just cover up what will still be toxic effects?
A: Cyanoacrylate is not toxic! The fumes from CA are a vaporized form of the cyanoacrylate monomer that irritate sensitive membranes in the eyes, nose and throat. They immediately are polymerized by the moisture in the membranes and become inert. They do not penetrate into human internal systems. In fact, CA that is used to suture wounds avert some of the infections that occur in stitched wounds. It also eliminates the need for stitch removal because it sloughs off along with the outer layer of skin after a couple of weeks. Cyanoacrylates have been successful in grafting skin, bone and cartilage; repairing eyes; closing dangerously ballooned blood vessels in the abdomen; and stopping spinal fluid leaks.
About 5% of the population can become sensitized to CA fumes after repeated exposure. Just a small exposure can result in flu-like symptoms. Our odorless SUPER-GOLD+™ CAs eliminate any adverse reactions. The most common misnomer about CA is that they contain cyanide and that the fumes will poison you. Not True! Period. Case closed.


Cheers

Colin

Though shellac is a natural product is it not considered a thermoplastic? ie a plastic that melts to a liquid when heated?

[Nick]

If anyone cant yet post links, just send them to me nick at lurcher dot org, and I will insert them.

I don't know about the effect of heat on super glue, but I know at normal temp its fine, we use it for patching holed in dogs, and glued a three inch wound close in a chicken that had be too close to a fox.

http://gentlebirth.org/archives/superglu.html

[al newall]

I use CA to stick my dental crowns back in. So i reckon i'm living proof that its not harmful.
Might have had some other strange effects though.

[Dave the bass]

I use CA to stick my dental crowns back in. So i reckon i'm living proof that its not harmful.
Might have had some other strange effects though.

Yer a proper DIY'er Al

Re- Loose valve base. I'm surprised no-ones suggested a tapped M10 hole and a 4" long M10 bolt, that should hold it in place...

Back OT, I've used 'Superglue' (CA) in the past on the big Bass amp I used to gig with, the 12 x 6L6 bases would sometimes become loose and rattle a bit. Seemed to work OK and I was advised to do that by the valve supplier I bought them from.

DTB

[nic]

Glassbond , available from Woolworths does the trick . Apply a small amount around the top of the base/glass , give it a slight twist and wipe away the excess with a cottonbud . This stuff seems to cure better outside and does not seem as 'orrible as super glue .

Hope this helps

cheers

Nic

[pre65]

Some glass bonding substances use UV rays to help cure, thats why they work better outside !