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Old 14th December 2012, 03:12 PM   #3281
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you are saying that all your F6 will not be the same ?

or that all ours* F6's will not be the same ?



-Tea , Coffee ?

-Yes , please .....


The Coca Cola Kid - YouTube

* not mine , Bubba
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Old 14th December 2012, 03:14 PM   #3282
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I meant each different design...

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Old 14th December 2012, 03:25 PM   #3283
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yup

I knew that was Yes, please....... sort of answer

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Old 14th December 2012, 03:28 PM   #3284
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With F6 and F5T trimed to similar distortion ratio at 1K, sou d is definitely unique to each design. I hate that SS fets dried up. This amp was going to be a great teaching tool for vlamp builders. F5 is trimmable, but doesnt seem to offer the range.
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Old 14th December 2012, 05:08 PM   #3285
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Quote:
Originally Posted by buzzforb View Post
With F6 and F5T trimed to similar distortion ratio at 1K, sou d is definitely unique to each design. I hate that SS fets dried up. This amp was going to be a great teaching tool for vlamp builders. F5 is trimmable, but doesnt seem to offer the range.

Suppose H2 and H3 are independent variables. There maybe a handle or a tweak [e.g. a Zen Pot] to increase and decrease %H2, and a second but different handle [?] which does not affect %H2; and also increases and decreases %H3 at will. Now I have the making of a two level factorial design leading to 5 experiments: A % THD analyzer is needed.
  • H2 High and H3 High
  • H2 High and H3 Low
  • H2 Low and H3 High
  • H2 Low and H3 Low
  • H2 Center [(H+L)/2] and H3 Center.
The above experiments are expected to yield 5 different sonic signatures because each distortion setting is a unique combination.

So, does the design of F6 have two different "tweaking handles" to independently vary H2 and H3?
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Old 14th December 2012, 05:09 PM   #3286
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YEs
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Old 14th December 2012, 05:19 PM   #3287
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YEs
Thanks buzzforb, your answer is great news. Please specify which handle affects H2 only, and the other one which affects H3 only.
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Old 14th December 2012, 05:26 PM   #3288
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Havent defined it that well but if you look back through the thread, hints are evrywhere.
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Old 14th December 2012, 05:30 PM   #3289
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Originally Posted by buzzforb View Post
Havent defined it that well but if you look back through the thread, hints are evrywhere.
Thanks buzzforb. The article on F6 by Mr. Pass has a wealth of info in a few paragraphs. I'll sort it out.

Last edited by Antoinel; 14th December 2012 at 05:42 PM.
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Old 14th December 2012, 08:57 PM   #3290
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Thanks buzzforb. The article on F6 by Mr. Pass has a wealth of info in a few paragraphs. I'll sort it out.
Mr Pass's article in 6moons has a great explanation on the specific handle [degeneration and JFET matching] to manage H2 and its different manifestations. In lhquam's post #s 3184 and 3186 he separated H2, and H3 from Total %THD. For example, in post 3186 he compared simiulation with actual results on TEASER-6. At 500 Hz, He found H2 was ~0.008%, and H3 was ~0.005%.

Truly low H2 and H3 numbers for TEASER-6. Suppose one operated diyF6 in Class AB mode. Will its comparative H2 and H3 be much higher? Will more H2 and/or H3 translate to better sonics.
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