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Original Message

12AX7 - do longer plates have an audio advantage ?

Posted by Ken Stuart on July 18, 2012 at 19:20:29:

I was researching vintage 12AX7 tubes, and a pattern emerged - over a variety of brands and countries of origin, "long plates" are more highly sought after and command a higher price. (Probably old news to tube fans.)

My question - is there actually a physical characteristic of a longer plate that is beneficial for audio sound quality ? OR is it simply a matter of the longer plates being used during a particular time period in the 1950s when the 12AX7 tubes were better quality ?

(If it really is the length of the plates, then it should also correlate with current production tubes as well, in theory.)