Generally speaking the Amperex would be more lively and closer to neutral than the Mullard/Brimar...The Mullard /Brimar tubes would have more Bloom and a bit warmer all around than the B/Boys....Depends on what sound your looking for..Personally I like the Amperex ( Herleen ) BB best of the three.......
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I really like the Mullard CV4004's. Indeed, all of this is personal preference and what tube works best in that piece of gear's circuit design. http://www.upscaleaudio.com/Mullard-CV4004_p_5.html |
I have never tried the Brimars, but have various iterations of the Mullard and Amperex 12AX7. I am currently enjoying a pair of RCA 7058, which is a ruggedized 12AX7 variant designed for automotive use! The heaters are set up a bit differently, with pin 9 to ground, so they will not work in all circuits. The sound is very dynamic and quite smooth, with a nice balance of detail and drive. |