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Here's a pic I took of a 6SN7GT VT-231 with a narrow base crack (before my...I mean, a crack fix).With some help from my close friend, Rod, I was able to pump a few pounds of organic nanocyanoacrylate elmersglysophate deep into the crevice.
Saved.
The pins could use some straightening. Bill...WTF?
"I can't compete with the dead". (Buck W. 2010)
Edits: 02/27/15Follow Ups:
knock that crack right back to the cold war.
My wife bought me a few of those Duluth Trading extra long T shirts.....problem solved.......
It will glue the glass back to the base,I wonder if it would work on the crack if you lightly clamped it until it dried. The next time I am "lucky" enough to find a "superior" tube with a cracked case (we still need an emoticon for being facetious) I will have to try it. Or has someone already done so and can save me the trouble?
I have several sweet sounding 6SL7s with similar cracks. We performed a sub-molecular analysis at work and discovered the crack creates an acoustic discontinuity that breaks up base resonances. We also determined that naturally occurring cracks sound the best. If you're lucky enough to have a 'SL7 or 'SN7 with a cracked base, I suggest not screwing around with it. It's going to be worth a lot of money someday.
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Buy Chinese. Bury freedom.
Rather than trying to fix cracks in other tubes, I'm digging into what causes them and what can be done to prevent them from forming.I've experimented on with dozen or so of my VT-231s by smacking them against the garage wall. Cracks have formed, but my instruments have failed to measure the forces and their orientation to the bi-polar axis. I could use a new set of 6AX4GTs in my tyanattic modulating platform but they're tough to come by.
I cracked a few red base RCA 5692s....they bled.
I think I'll try this 866A next. It looks like it's no good anyway. The getter is really blotchy, and it has coagulated into little blobs on the envelope.
"I can't compete with the dead". (Buck W. 2010)
Edits: 02/28/15
but those bases are tough!
"
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
No, but what kind of plastic material are these bases made of? Would West System Epoxy + micro balloons adhere to this type of plastic?
Observe, before you think. Think before you open your yap. Act on the basis of experience.
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"I can't compete with the dead". (Buck W. 2010)
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