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In Reply to: RE: I know I have been tough on 12ax7 but....... posted by Mendel on January 27, 2011 at 08:08:08
I used all three in many types of equipment- not bad tubes. A step up is Mullard long plate & Brimar CV4004 12AX7s.
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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
The Brimar is neutral, uncolored and crystal clear. It is also bright with a lot of detail. I like this tube.
The Mullard 12AX7 (F91) long plate is warmer & musical. The Mullard is definately darker as described. I find the F91 betters the Brimar per my tastes. Wish I had some NOS just to own the tubes. I would guess a NOS pair if found would be at least $500 per pair.
The original posters tubes are ok, but do not cut it for me. Kind of like listening to a $500 vs $4000 amp. Hard to go back to the $500 model.
Ha Ha. Neff, you are a laugh a minute! Thank the Lord we have you to tell us what is good. You should become a member!
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