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As I previously told to manage six channels built around Russian tubes, and patricianly as different as 6C33C, is a pain in ass. Today, carefully examining my log file that I keep about the performance of each tube in the amp, in addition to everything else, I detected another interesting pattern: the tubes in the Super Melquiades after almost a year of working …  believe you or not but they self-tuned to each other.

The six channels were initially selected more or less accurately (by gain) and I was under impression that all channels would age gracefully and identicaly. However, now all tubes of one amp self-tuned itself and have absolutely identical gain (-+ 1/4db but there were -+3/5dB). Another amp’s tubes did the same but at +.5dB upper. It all happens despite that one of the tubes in LF channel in my left amp should output +1dB (it was how it was initially intentionally set due to the LF asymmetry of my room).

Very, interesting discovery! The tubes in the Super Melquiades kind of co-set each other (probably because they were driven with the same voltages) and they somehow self-tuned each other. In a way it is similar how female’s menstruation cycles get synchronies by some mysteries reasons. It is well know that women who stay in lesbian relationship after a few moths get theirs periods completely synchronized. Why it happens is mystery, perhaps some kind of biological clock offset the periods cycles with some kind of jitter… however, what kind “clock" works in the Super Melquiades that sel-tunes the tubes?

Go figure!

The Cat

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