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Paul S wrote:

Aparently, a few people complained back to Ken Chait that his "carefully-matched" (with an adaptor on his Amplitrex AT-1000 machine, i presume) pairs either weren't matched to begin with, or they did not stay matched.  Anyway, Ken's response was that he will no longer knowingly sell 6C33Cs to "Lamm owners".

First of all I do not know who Ken Chait is. I presume that he is a tube dealer who sells 6C33C. Hey, how frequently you see me to defend the dealers? In this case I would. I think that was incorrect to bitch about Lamm owners as they are not particularly annoying breed. The 6C33C before matching need to be well burled, I would say 60 hours at least - NO ONE would do it. Since Ken Chait charges probably just a few bucks for matching then I assure you that he does not burn the tubes. To match the “fresh” 6C33C is like building a levee from sand. So, why I am defending the Ken Chait? Because even the well burned and match 6C33C very much might age with different tempo, in fact they will age differently – this is the nature of the 6C33C beast. You are annoyed? Wait when you run DSET with 6C33C – then you will be really annoyed.

Anyhow, the problem is not with Ken Chait or Lamm owners but in the totally foolish expectations that 6C33C might be matched. Well, if you do burn the 6C33C for 50-60hours and do match it by gain, by bias and by currant then you have MORE chance then the tube will age similarly but it will NOT be an assurance. Do you know how many tubes I would need to go over to match the paid of 6C33C properly? I would say 20 tubes. So, I feel that the best solution would be juts to buy a shit-loaded of cheap 6C33C. Match them by gain and discard bias. That is fixed bias, what would be the difference is you get you default current with 70V or grid or 80V.

What I do is to use a pair of new tubes, match them by gain, check the gain each few month and in one year I trash both tubs if the tubes did not develop any other “problematic” signs earlier.

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