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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s
Post Subject: The discipline with tubes.Posted by Romy the Cat on: 1/2/2011
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Lamm uses Russian ceramic sockets, at least use to use them 10 yeas back. What he uses not I have no idea. The material of sockets is not as important – the profile of contact is the key. Unfortunately Russian sockets use triangular contact that makes the actual contact with tube pin in single point, thus inclined to arcing.

The thumps effects that you descried indeed have absolutely nothing to do with arcing. Read my 6C33C Survival Guide (link thread). The thumps while heating up (and later on) are unmistakable signs that the tube is dying. It is very important as soon you find out what tube it is to replace it and immediately to trash the dying tube. I can not stress it hard enough – the thumping tune must do to garbage can. I know that it is fine looking nice tube and I know that you have sentiments to use if for “something else”. Trust me, I have many amps with 6C33C and use them foe long time: no matter how good you mark this tube and put it in a “special peace” with the bad tubes -  this tube will find it’s own way to the pull of good tube and you will be forces to fish it out again. So, as soon you heard the very first thump, find the tube that do it and toss it to garbage. Do not forget that the cost of the tube is equal to the cost of a sandwich you eat during your lunch.

The Cat

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