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In Reply to: RE: Best glue for loose tube bases? posted by andy evans on September 19, 2017 at 00:23:36
I have always had good luck with using clear nail polish. It seeps down in between the glass and the base and tightens things up again.
Follow Ups:
Nail polish in nitrocellulose, same stuff smokeless gunpowder is made of.
Are we talking about nail polish or nail polish remover? Nail polish remover is traditionally acetone based, though you can get acetone free versions as well. Presumably it isn't the acetone that's nitrocellulose....
I'm talking about clear nail polish.
Edits: 09/19/17
Eli D writes "First, try a solvent, like acetone or MEK. "Reactivating" the old cement may be all that's needed. If additional holding power is needed, try cyanoacrylate".
He seems to be saying use acetone to re-activate the old glue, not add fresh nail varnish.
If that's the case I like the idea of re-activating what's already there before adding either superglue or RTV silicone. Seems to make sense.
To each his own. The polish has and continues to work well for me. It must have some solvents in it as well, becuase it seems to soften the old glue before it dries. The solvents are probably volatile and evaporate off. If I ever have some acetone around I will give it a try.
Edits: 09/20/17 09/20/17 09/20/17
"To re-cement the tube, use clear nail polish - paint a ring around the base, let the polish soak into the old cement, recoat, and let dry overnight. Polystyrene "coil dope" works as well, and can be used to refill the nail-polish bottle. Solvent (acetone, etc.) are ineffective in softening the old base cement - the cement was baked hard in manufacture, and "nothing" dissolves it."
Source : Tube Lore by Ludwell Sibley - post by Bas Horneman
Matches what I have read in old radio restoration books and articles. Thanks for the info.
The old time radio guys used it forever and so have I. Never had any problems, and I have fixed lot of loose tubes that way. You don't need much, just 2 or 3 drops placed around the base between the glass and the base material.
Edits: 09/19/17 09/19/17 09/19/17 09/19/17
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