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Posted by Ralph (M) on February 15, 2012 at 09:57:03

In Reply to: RE: Yup! nt posted by bjh on February 14, 2012 at 17:53:02:

Lew makes a good point as does 6AS7_6AS7. The Berning, while being a brilliant design, is also not an OTL. An OTL will not have semiconductors and a transformer (whether air core or iron core) in its output, in fact an OTL will not have any impedance matching devices other than the power tubes themselves. The Berning amps fail on all three counts. That does not take away from the amp itself though. Its just that it is simply incorrect to classify it as an OTL.

Berning admitted in a letter to Positive Feedback nearly 15 years ago that his design is not an OTL. His approach allows for Zero Hysteresis in the output transformer (hence the 'ZH' aspect of his model numbers). However he pointed out in his letter that it was difficult to explain the idea of zero hysteresis, but he found that people understood the idea of OTL, so he went with that. Fifteen years of marketing and arguing later, this fact has not changed.

I would challenge you on the preamp comment though: "Oh, no! Don't take me. Wait a little 'till the big Billy Goat Gruff comes. He's much bigger."

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Follow Ups Full Thread

Topic - Gaga - bjh 06:38:25 02/11/12 (20)

RE: Gaga - tyu 05:15:33 02/16/12 (5)

Tyu, you figured me out... - Lew 12:10:11 02/16/12 (1)

2nd that, with regards to David Berning - Ralph 13:52:51 02/16/12 (0)

RE: Gaga - 6AS7_6SN7 10:10:28 02/16/12 (2)

snow in Italy - Lew 16:20:54 02/16/12 (1)

RE: snow in Italy - 6AS7_6SN7 23:52:42 02/16/12 (0)

RE: Gaga - 6AS7_6SN7 00:52:32 02/13/12 (13)

RE: Gaga - bjh 17:55:29 02/14/12 (8)

uncalled for! moderator please remove this thread. nt - Ralph 09:58:49 02/15/12 (7)

RE: uncalled for! moderator please remove this thread. nt - tyu 05:24:35 02/16/12 (3)

no, it was something else. - Ralph 11:32:37 02/16/12 (2)

Last post - bjh 12:58:58 02/16/12 (1)

Fine- it does not belong here anyway. - Ralph 13:51:25 02/16/12 (0)

It's a guitar amp, I never said it was OTL lol keep your panties on. nt - bjh 11:19:02 02/15/12 (1)

No, you didn't - Ralph 11:38:49 02/16/12 (0)

moderator moderator! - bjh 11:14:57 02/15/12 (0)

Yup! nt - Ralph 10:06:42 02/13/12 (3)

RE: Yup! nt - bjh 17:53:02 02/14/12 (2)

troll warning - Ralph 09:57:03 02/15/12 (0)

RE: Yup! nt - Lew 21:23:25 02/14/12 (0)

Follow Ups

troll warning - Ralph 09:57:03 02/15/12 (0)

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