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Vacuum tube repair

post #1 of 13
Thread Starter 
I bought a used Brimar CV1988 and it came in yesterday. I sounds great but the glass has some give in it. It does not shake or anything but the glass can be wiggled on the base.

Can I Gorilla the glass to the base, or is there another procedure that I should follow. As I said, the tube works perfectly. I just want to make sure it stays that way and keep the wiggle from getting worse.
post #2 of 13
I've used super glue in a couple spots around the tube between the glass and base before. Not sure if its a good idea or not but in my case I had no problems and the tubes continue to work.
post #3 of 13
Just use a glue that can take the heat...a silcone sealer of something might do the trick. Also, make sure there are no cracks or chips in the glass, or any weak points that can cause vacuum loss.
post #4 of 13
other than the silicone sealant that GM mentioned - all of those options mentioned above, unfortunately, may cause hot spots on the tube

even with sealant, you have to make sure it is TRULY dry before you power the tube back on.
post #5 of 13
If it's only slightly loose in the base then I won't worry
post #6 of 13
I've left a few loose ones alone. I don't tuberoll and rarely move my gear. If it's not going to move much, you could safely leave it as it is.
post #7 of 13
Thread Starter 
I think i'll leave it alone. It is the Black base version of the CV1988 and I don't want to mess it up.

I'll leave it in the amp and keep the movements to a minimum.
post #8 of 13
Yeah, ultimately I'd just leave it alone. Sucks though because tube rolling is one of the fun parts!
post #9 of 13
Quote:
Originally Posted by Gollie View Post
I'll leave it in the amp and keep the movements to a minimum.

I'll be sure to give it a good tug by the glass when I come over to listen to it.
post #10 of 13
Quote:
Originally Posted by Orcin View Post
I'll be sure to give it a good tug by the glass when I come over to listen to it.
Will you twist it as well? Now, that is bad!
post #11 of 13
Thread Starter 
Quote:
Originally Posted by Orcin View Post
I'll be sure to give it a good tug by the glass when I come over to listen to it.
Still waiting on shipping notification from Mikhail. I will let you guys know when everything arrives.

It should be a pretty nice set up once it is all said and done.
post #12 of 13
Quote:
Originally Posted by Gollie View Post
I bought a used Brimar CV1988 and it came in yesterday. I sounds great but the glass has some give in it. It does not shake or anything but the glass can be wiggled on the base.

Can I Gorilla the glass to the base, or is there another procedure that I should follow. As I said, the tube works perfectly. I just want to make sure it stays that way and keep the wiggle from getting worse.
I thought I had one of these tubes, and I think I do. Mine is a Brimar 6SN7GT "Made in England". On top it has "4K4 383". Are they the same tube?

Funny thing is that the base on mine was loose and I used 3 small drops of super glue. Still working fine!

BTW, how good are the Brimar supposed to be?
post #13 of 13

I'm surprised this hasn't been mentioned since 2008, G-S Hypo Cement . Can be bought on ebay or Amazon very cheaply.

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