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In Reply to: RE: I know I have been tough on 12ax7 but....... posted by Escobar on January 27, 2011 at 10:23:03
I'm starting to be of the opinion that 5751s are less dynamic than their 12AX7 counterparts. That the 5751 perception of focus comes from the fact that every musical element is highlighted whereas the 12AX7s are more natural sounding with greater depth and dynamics.
The real beauty of music lies in the ambience of the venue.
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Again it should be noted that 5751's have a slightly lower amplification factor in comparison to a 12AX7. Not surprising you lose a little in dynamics. IIRC 5751's were developed in order to compete with the European ECC83 which had better control of the signal.
Stu
There may be some truth in that Anacrusis.My favoured 12ax7's do seem to have greater dynamic swing to them.But a windmill 5751 has great dynamics too. Depends on the tube combinations. Most of the time I find most 12ax7 too hazy and unfocused to be reminiscent of the real thing. But if you find the right one with the right combo of driver and output tubes, they can sound very good.
Diode, I never find 5751 bright in my system. Now, something like Neff's favoured Brimar or a Tele ribbed plate--that can sound bright with the wrong combo of tubes or in the wrong gear.
I guess its all a matter of balance with different tube sets in different gear. I guess 12ax7's have their place. In general I still think the 5751 is the better tube.
To my ears 5751's sound brighter and a touch harder than 12ax7's, which would be a good thing in a lower resolving system, but is a bit too much of a good thing in a higher resolving rig.
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