F6 Amplifier

[Zen Mod]

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

[Nelson Pass]

I meant each different design...

[Zen Mod]

yup

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

[buzzforb]

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.

[Antoinel]

Originally Posted by buzzforb

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?

[buzzforb]

YEs

[Antoinel]

Originally Posted by buzzforb

YEs

Thanks buzzforb, your answer is great news. Please specify which handle affects H2 only, and the other one which affects H3 only.
Best regards

[buzzforb]

Havent defined it that well but if you look back through the thread, hints are evrywhere.

[Antoinel]

Originally Posted by buzzforb

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.

[Antoinel]

Originally Posted by Antoinel

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.