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I'm using a 6922 type tube with the "tip" broken off..... It's still a working tube, but I do have a concern that the glass might eventually "fail" with the heat cycling.....1. Does a tube with the "tip" broken off pose a greater risk for glass failure?
2. Is there a way to "dress" the tube tip to help prevent further fracturing of the glass?
This happens to be a really good sounding sample, I'm kind of wrestling with the decision to "retire" the tube, run it and risk failure, or somehow assure a normal tube life by "dressing" the glass where the tip broke off. Responses are appreciated.
Edits: 02/14/21Follow Ups:
Sorry to hear that.
The structural integrity is compromised - but we do not know by how much. The greatest risk is the heating up and cooling down of the tube and how that will stress the compromised structure.
The resin in a windshield repair kit cannot handle the heat of the tube. Best guess is a high heat epoxy to fortify the broken tip.
Good luck!
Paul
I've come across their name in chats on DIYAudio.com
No affiliation or experience with them.
"Broken tip" isn't on their list of repairs, though they do suggest emailing a pic. Minimum charge is $100, but maybe they'll just offer some advice?
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
The 'tip' of the tube is a relatively strong/thick area, so a clean break in the absence of other damage should be fine.However, you said;
"to help prevent further fracturing of the glass?"Are you withholding critical information? Are cracks/fractures visible below the severed tip?
If so, the vigilance others have recommended would be wise, or maybe toss it if you think a catastrophic tube failure would have downstream consequences that you would like to avoid.
Edits: 02/14/21
I should look at the tip/break under strong magnification...... My eyes alone are no longer good enough to determine whether the break was "clean"....
I do see the underside of the glass comes up "relatively close" to the break, but I need to find out if there are "micro cracks" near the break location.
i once repaired a broken tip with the flame from a gas pencil torch carefully melting the rest of the tip. it worked and the glas was perfectly sealed again.
N.
But its the 1st thing that came to mind. I've used it in many sketchy situations. So far it has worked
=========================
You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
I was thinking Cyanoacrylate Glue, known as Crazy Glue or Super Glue. Also a small drop at the tip to reinforce the area. Both would be dependent on material expansion due to heating.
It sucks to get old. It really sucks to get old and bitter.
You can also try the glue/resin that is used to fill/repair windshield chips - I believe those are designed to fill in the gaps, and expand/contract.
That was my first thought, too. If this was something I was worried about, a drop of that on top of the tube would be my solution.
--------------------------
Buy Chinese. Bury freedom.
I agree with Story. Run it, and peek at it occasionally.
It will probably be fine longer than you.
If it was me, I'd drop it on its head and try to make it fail. If it doesn't....it was a good test. If it fails, it was a good test. But I say that knowing I have others.
Your interest may vary but the results are the same (Byrd 2020)
I can't compete with the dead. (Buck W. 2010)
Cowards can't be heroes. (Byrd 2017)
Bugs
The 6922 is a small signal tube and does not produce enough heat expansion/contraction to worry about in most cases. How fractured the break is will matter. I've used one like this for years and no failures. You can always take a peak at the getter flashing once in a while and make sure it's still silver in color. If one day it's gone or turns white, that's a tube that has lost vacuum. The tube may also start to become noisy or sound weird so that's an early clue.
I am unaware of any sealant that would have the same expansion characteristics as glass and would actually adhere to the glass. Loctite does make a glass glue but it wasn't meant for this.
anybody know?
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