John Curl's Blowtorch preamplifier part II

[jacco vermeulen]

Originally Posted by simon7000

Actually, words should do it.

Actually, there's a similar situation for vibrations (local + global, with the polynomials)

More transparent in a matrices outfit, if you don't mind the comment.

[simon7000]

Originally Posted by jacco vermeulen

Actually, there's a similar situation for vibrations (local + global, with the polynomials)

More transparent in a matrices outfit, if you don't mind the comment.

Yes, a matrix is the best presentation, but when I paste one into this engine it does not come out that way. I suspect an attached file would be better.

SY,

The only Elmore & Sands I find is dated 1949, is that the one you refer to?

Yes there may be than one person who can follow the math. Now how many people on these threads KNOW how bad (Pick 1), local feedback, global feedback, no feedback, feed forward, etc. sound.

I will do the pictures in COLOR given the time just to get the point across!

ES

[jacco vermeulen]

Originally Posted by simon7000

Now how many people on these threads KNOW how bad (Pick 1), local feedback, global feedback, no feedback, feed forward, etc. sound.

Shouldn't you add : and at which point in time ?

[SY]

Originally Posted by simon7000

The only Elmore & Sands I find is dated 1949, is that the one you refer to?

Yes. I think the edition I have is later, maybe early 60s?

edit: I was mistaken- they looked at effects on noise and bandwidth, not harmonic distribution.

[john curl]

As far as 'Linear Audio' Vol. 1 is concerned: I have been reticent in commenting on it, because I might say something that is either just polite and complementary, or I might slip into some moderate criticisms, if pressed. Then the 'fur might fly' and this is what I hope to avoid.
I found Ed Simon's resistor article on Resistor measurement excellent and useful.
As to the rest of the articles, I am fairly aware of the design facts and processes, so there were not surprises there. Useful material for the newly exposed engineer or technician to these design approaches.

For the record, 'We put TIM and SID together as the SAME, back in the late 1970's, as I personally got Walt Jung and Matti Otala together to sort it out, when we were all at an AES convention together. Making any corrections to 'history' at this time appears to be because the writer was not even born when we were researching (in the wilderness, comparatively) and names and definitions were still vague. After we spent about 10 years separately and collectively, working on the problem, we had it pretty well down, as we explained to Bob Cordell in our follow up to his similar criticisms in 'Audio' back about 1980.
It is always easy, after the fact, to criticize the 'overstatements or oversights' of others, once the 'fog of discovery', clears.

[SY]

But irrespective of his birthdate, do you have a substantive technical criticism of Bruno's article? Or do you agree with his analysis and conclusions?

[jacco vermeulen]

Originally Posted by simon7000

Elmore & Sands

The Manhattan Hi(gh)-Fi(ve), right ?

Peter van Willenswaard was very much around, iirc.

[SY]

It's online now.

Electronics-Experimental Techniques : William C. Elmore & Matthew Sands : Free Download & Streaming : Internet Archive

[PMA]

Originally Posted by john curl

Well shown, PMA, this is really interesting!

Yes. I hope it might be helpful even for you, regarding what issues to concentrate on.

[jacco vermeulen]

Originally Posted by SY

It's online now.

Cool, obrigado.