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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s
Post Subject: Cracked glass at tube's "base"Posted by Paul S on: 8/14/2008
where the pins go through the tube glass

Thanks for the tips, Romy.  But I am not sure from your response if you now get that it IS the glass at the bottom of the tubes themselves that cracked.  The cracks did not "run" up/break the tube envelope but stayed across the bottom/base.  The tubes remained "whole" when I took them out of their sockets, and they did not break further when I tossed them onto the empty bottom of the waste basket from a standing position.  "Clunk", but no more breakage.  Go figure.

I might replace the sockets to stop micro-arcing, if I thought that was a serious problem and I could solve it that way.

Although I would not choose the stock sockets Lamm provided, neither would I venture to replace them at all based on these two tubes cracking or even because of that much corrosion over 18 months; it would have to get worse.

Uncommon and unlikely as it may be, and in the absense of a better explanation, I still think I cracked the tubes myself, as I described it.  These tubes came in a "sleeve" of 5, so they may be from the same, fragile lot; although I had no problems with the first pair that I think I treated the same way.

I guess if you live long enough...

Best regards,
Paul S

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