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In Reply to: 12at7 not a stellar performer.....as a voltage amp posted by grhughes on March 21, 2007 at 07:04:17:
Depends on how you run it. I get superb results using it as a medium swing (10-20V) voltage amplifier, but I actually bothered to play with operating points and take a ton of spectra. And I also tested a very wide range of versions, ranging from the Genelex B739 to the GE6201 to the modern JJ oddballs.That said, the Tek versions are nothing special. Not the worst (6201 wins that one), just middle-of-the-pack.
Follow Ups:
Okay, I'll bite. I find the 6201 the best for me (runing valvo hamburg) and all of the standard 12at7 horrid so far. Which ones do you like?
Current production JJ. Far and away better than any NOS I've tried. And there are some pretty good NOS out there...
Mahatma and everyone,
I'm trying to fix a trace of glare and harshness I'm getting with new EH 12AT7 inputs on my PP amps (Manley Snappers EL34). The amps have about 70 hours on them, and have improved a lot since new but seem to be pretty steady now. 12AT7 is being used as phase splitter into GE7044, so I guess the triode sections should be matched. Will the JJ be appropriate for this and smooth out that glare? Or will I need an old Genelec or something more expensive?
Thanks
Rich
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