Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
In Reply to: RE: Sorry no, its designed in distortion numbers are quite poor posted by Timbo in Oz on October 17, 2015 at 20:19:16
Yes the numbers for a 12AU7 are worse than most. However they do have their uses. Low gain stages are one of them. You have fallen into the same trap as your hero Eli D. The 12AU7 is very nonlinear when driven lightly. Ram at least 6-7 ma through and it runs out fairly well. It also works pretty good at low voltages unlike 6CG7 or 6SN7.
Is it a great tube. No, and I never said that. What I took exception to is your generalization.
The links you supplied are all gibberish.
If you want to see how a 12AU7 can be used in a line stage check out
Copland, Conrad-Johnson, Belles, Beard, Cary, and any number of manufacturers. Yes they were once cheap, but so were all the other tubes.
I know it's customary to believe that a 12AU7 used as a cathode follower is benign, because the stage produces no gain, but I recently replaced a 12AU7 with a 12FQ7 (essentially the 12V filament version of a 6CG7) in a vintage Quicksilver preamplifier, and the improvement in sound was easy to detect. One "problem" with the older Quicksilver is that perhaps inadequate current is made available for best performance of either a 12AU7 or a 12FQ7, I admit. I have been thinking about how to pull more current from the PS without stressing it.
And I along with many other believe that $$$$$$$$$ audio gear is mostly con-job and conspicuous consumption.
Particularly or especially cables. Closely followed by mega-buck speakers.
Skeptical Measurer & Audio Scrounger
Post a Followup:
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: