John Curl's Blowtorch preamplifier

[Nelson Pass]

Originally posted by scott wurcer
I'll bet you never expect the Spanish Inquisition either.

Nobody expects the Spanish Inquisition!

[dave_gerecke]

Yes, but did they watch out for the attack killer bunny rabbit?!

[john curl]

Metalman, you missed the point. I started to talk about the RESIDUAL RESISTIVITY of conducting metals, but we got sidetracked with Dr Hawksford, misplaced humor, and other things.
First, the TEMPERATURE of the metal is what I am not concerned with. Essentially, in a gross way, one might say that the measured resistivity of a metal is almost completely dependent on temperature, BUT it is the RESIDUAL RESISTIVITY that might change the formula enough, even though it is difficult to measure and access within the normal resistivity. Who is sure that the residual resistivity is not more of a problem at low signal levels? That is my question, just like why does a small amount of certain kinds of harmonic distortion make a sonic difference?
What is this residual resistivity composed of. Is it really LINEAR? (I actually don't know the answer exactly, myself.)

[janneman]

Originally posted by PMA
I returned to hifi audio, as a hobby, some 7 years ago, after 20 years gap (20 years ago I built something and believed it was beyond audibility limits ), first only as a hobby, then it became a small part of my design, consulting and business activity.

6 years ago I would swear that cables make no difference, impossible, nothing to measure, nothing to hear.

5 years ago I would swear opamps are the best audio solution.

3 years ago I had quarrels with John here (my apology).

During those 6-7 years, my view at audio has completely developed and changed. Without continuous listening experience and comparisons, my view would have been the same as 7 years ago.

PMA,

Interesting travel. Now brace yourself: the next 7 (or 14) years will even change you more. If you continue to question, of course.


Jan Didden

[PMA]

Jan,

IMO, the people who insist on inaudibility of opamps vs. discrete, signal cables change etc. :

- do not listen to reproduced music too much,
- do not have much experience with various high quality systems,
- do not have good sound source and good recordings,
- have wrong placement of speakers or bad room acoustics,

- or are just engineers who do not listen at all.

[janneman]

Originally posted by PMA
Jan,

IMO, the people who insist on inaudibility of opamps vs. discrete, signal cables change etc. :

- do not listen to reproduced music too much,
- do not have much experience with various high quality systems,
- do not have good sound source and good recordings,
- have wrong placement of speakers or bad room acoustics,

- or are just engineers who do not listen at all.

Hmm. Not really a great basis for constructive discussions. There are not many people who succeed to find the Absolute Truth (tm) in only 7 years. .

I was just trying to encourage you to continue to question and search. Knowledge is like an onion: when you finally peeled back the skin to find what's underneath, you find - another onion ...

Jan Didden

[jacco vermeulen]

Originally posted by scott wurcer
have you got

Agenda note : BA09, pack a salami crucifix.

[albin]

hello
anyone.Heaviside"We reverse this",and all that.
what limits the risetime of a pulse in a wire(or a cap)?
or is life too short.
regards
max

[JPV]

Originally posted by PMA
Jan,

IMO, the people who insist on inaudibility of opamps vs. discrete, signal cables change etc. :

- do not listen to reproduced music too much,
- do not have much experience with various high quality systems,
- do not have good sound source and good recordings,
- have wrong placement of speakers or bad room acoustics,

- or are just engineers who do not listen at all.

There must be a lot of second order effects that are difficult to model and quantify. Quantification is an important issue.

I would like to have your comments on my posts on thermaltrack Vbe tracking
http://www.diyaudio.com/forums/showt...77#post1649577

I can be wrong but at least there are some quantification aspects to this problem that should be compared with the experience of a qualified music listener.

Thanks

JPV

[Bonsai]

PMA . . . . I don't think there are any sensible people on this forum claiming these things all sound the same . . . .and if they do, they are not well informed, so who cares anyway?