RE: Sorry no, its designed in distortion numbers are quite poor

Posted by Lew (A) on October 19, 2015 at 08:41:33

In Reply to: RE: Sorry no, its designed in distortion numbers are quite poor posted by Blackdog on October 17, 2015 at 20:41:11:

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.

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Follow Ups Full Thread

Topic - 6CG7 instead of 12AU7? - ChasLieb 14:55:34 10/06/15 (13)

Much better sound and the pin-outs are different, some resoldering required. - Timbo in Oz 15:56:32 10/16/15 (4)

Cheap?? That's not true at all. - Ralph 12:45:08 10/19/15 (3)

Re:Other than the heater voltage, is the 6cg7 a substitute for the 12au7? - woffeldjur 10:08:28 11/12/15 (2)

Almost - Ralph 11:11:58 11/12/15 (1)

RE: Almost - woffeldjur 08:42:08 11/13/15 (0)

RE: 6CG7 instead of 12AU7? - Ralph 10:18:39 10/07/15 (7)

in most usage where the dissipation is low 6CG7s should sound just like a 6SN7 - Timbo in Oz 15:53:06 10/16/15 (6)

RE: in most usage where the dissipation is low 6CG7s should sound just like a 6SN7 - Blackdog 16:03:09 10/17/15 (5)

Sorry no, its designed in distortion numbers are quite poor - Timbo in Oz 20:19:16 10/17/15 (4)

Never seen a 12AU7 in an RF circuit - Ralph 09:22:03 10/19/15 (0)

RE: Sorry no, its designed in distortion numbers are quite poor - Blackdog 20:41:11 10/17/15 (2)

RE: Sorry no, its designed in distortion numbers are quite poor - Lew 08:41:33 10/19/15 (0)

I don't buy new, I now just upgrade / rethink vintage stuff. - Timbo in Oz 20:51:31 10/17/15 (0)

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RE: Sorry no, its designed in distortion numbers are quite poor - Lew 08:41:33 10/19/15 (0)

RE: Sorry no, its designed in distortion numbers are quite poor

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