RE: Yes, their gain is about 1/5th, as are their impedances

Posted by jaydacus on April 5, 2016 at 04:41:26

In Reply to: Yes, their gain is about 1/5th, as are their impedances posted by Timbo in Oz on April 2, 2016 at 15:26:36:

The VTA ST120 was originally designed to take the 12at7. I later modified the driver board by changing out certain resistors at per instructions I received to take the 12au7 instead for lower gain.

I ended up switching my Chi-Fi amp back to the 12ax7s due to negative effects on distortion levels and the overall flatness of the sound. Will find some vintage 12ax7s eventually. Thanks for all of your input. `

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Follow Ups Full Thread

Topic - Are There Any Issues Using 12au7 in Place of 12ax7s? - jaydacus 16:34:08 04/01/16 (11)

You obviously like lots of distortion. - Timbo in Oz 02:25:41 04/05/16 (0)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - JimL 22:34:02 04/02/16 (5)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - Nunki 05:11:40 04/03/16 (4)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - Tre' 11:09:37 04/03/16 (3)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - Nunki 11:36:40 04/03/16 (2)

IF the heater winding fails you will be looking for a whole new power transformer. - Timbo in Oz 02:23:19 04/04/16 (0)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - JimL 19:34:34 04/03/16 (0)

Yes, their gain is about 1/5th, as are their impedances - Timbo in Oz 15:26:36 04/02/16 (2)

RE: Yes, their gain is about 1/5th, as are their impedances - jaydacus 04:41:26 04/05/16 (1)

RE: Yes, their gain is about 1/5th, as are their impedances - Steve. 11:30:06 04/11/16 (0)

RE: Are There Any Issues Using 12au7 in Place of 12ax7s? - Tre' 18:13:59 04/01/16 (0)

Follow Ups

RE: Yes, their gain is about 1/5th, as are their impedances - jaydacus 04:41:26 04/05/16 (1)

RE: Yes, their gain is about 1/5th, as are their impedances - Steve. 11:30:06 04/11/16 (0)

RE: Yes, their gain is about 1/5th, as are their impedances

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