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Posted by unclestu on January 27, 2011 at 15:05:27:
pointed out that the Brimar CV 4004 is a very different animal from the Mullard version: The Brimar is quite bright in tonal balance, while the Mullard is very dark, relatively speaking.

Also It should be pointed out that I have seen three different versions of Mullard Long plate 12AX7. The earliest I have is the mC1, then comes the f91 and f92, although I have seen 91's with 92 construction. A true 91 has a tiny wire attached to a metal staple on the top mica which touches the cathode. The 92 eliminates that little wire ( looks like a piece of filament wire).

All three have very different sonic characteristics. I find the f91 to be the most open with a slight upper midrange emphasis. The 92 sounds significantly flatter in the soundstage, and the mC1 has greatest amount of bass although a tad too warm for my taste.

Stu