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Old 5th June 2008, 06:13 AM   #6201
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Here we go:

(distortion 3rd H is 0.000015%)
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Old 5th June 2008, 06:15 AM   #6202
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Amplitude frequency response. Any suggestions to make it with opamp?

(noise 0.4nV/rtHz)
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Old 5th June 2008, 06:24 AM   #6203
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PMA, I thank you very much, but I think that we have hit the end of the line. I will not put forth anything directly that is less than 30 years old on this website, but it has been fun to see these models of topology idealized. I personally don't see the point in giving any more real information to this general group of people. Feel free to contact me directly or through this thread, but I have run out of steam. Thanks again for your great modeling, I wish I could share more sophisticated topologies here, but I just can't afford to.
 
Old 5th June 2008, 06:35 AM   #6204
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John -

thank you very much. I have been aware of this what you are saying, I have been aware of possible inconveniences resulting from evolution of your hints. It has been great to co-operate with such GREAT designer as you are.

Thanks again,

Pavel
 
Old 5th June 2008, 07:04 AM   #6205
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Quote:
Originally posted by john curl
PMA, I thank you very much, but I think that we have hit the end of the line. ............
Hi John,

The end of the line? I don't think so. The biggest challenge is how to realize the correct bias currents.

@Pavel

In the virtual world of MC, the voltage sources V5----V8 are easily implemented. But would you do that in real life?
How to address issues like noise, internal resistance, and (maybe even more important) temperature compensation.
See also: http://www.diyaudio.com/forums/showt...31#post1490431

Cheers,
Edmond.

PS: Is this input"'technical" enough?
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Old 5th June 2008, 07:07 AM   #6206
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Hi Edmond,

yes, this is the perfect input of yours, but I would follow John's wish and not going to evolve this idea anymore. It was not my circuit idea in the beginning.

Regards,
Pavel
 
Old 5th June 2008, 07:19 AM   #6207
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Hi Pavel,

Then I will try it.

Cheers,
Edmond.
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Old 5th June 2008, 08:47 AM   #6208
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Quote:
I think Carver adjusted the Zout of his amp to make it indistinguisable (in sound) from a specific tube amp. Successfully.
How was success determined? Was it scientifically or subjectively determined? If it was not by scientific method then that little story of common knowledge must be refered to the dustbin.
 
Old 5th June 2008, 09:10 AM   #6209
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Quote:
Originally posted by Bas Horneman


How was success determined? Was it scientifically or subjectively determined? If it was not by scientific method then that little story of common knowledge must be refered to the dustbin.

Bas,

According to this post there was at least one single blind test.
I like that guy: first building an all-out, no-holds-barred super-expensive amp, then built one that sounds the same but goes for 1/40 of the price...

Jan Didden
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Old 5th June 2008, 09:19 AM   #6210
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From the Polk Audio ste: (don't know how accurate this is):

"Yes Bruce. After "The Great Amplifier Challenge" in Santa Fe, the Stereophile guys just couldn't give him the credit he had just earned in the motel room they paid for. Three things came out of the challenge:

1. He absolutely with no questions asked, met all the parameters he and Stereophile had set forth. In 48 hours, in a motel room, he made his solid-state, $629 retail amp sound EXACTLY like a pair of Conrad-Johnson Premier 5's. Stereophile admitted it. In fact, after 24 hours, his amp sounded exactly like the C-J's, except the low-end wasn't as "muddy" as the C-J's. Those were Stereophiles words. "Yours has better, tighter bass" were also Stereophiles words. So he sent them home, "muddied" up the low-end on his amp, called them back, and Stereophile threw in the towel.

2. It was reported in Stereophile that he "won", but they just HAD to add that they didn't THINK he could keep up the QC on a factory assembly line.

3. They also said, "If he's SOOOOO good, why doesn't he design his OWN reference amp instead of emulating the sound of everbody elses?"

That pissed him off enough to design the Silver Seven's. I don't recall if Stereophile ever reviewed it, but The Absolute Sound did, and they indicated it was in fact, maybe the best amp ever built.

Every SS amp he designed after that was "transfer function modified" to emulate the sound of the Silver Sevens.

That run started with the M4.0t, and included the TFM series (I don't think the TFM-6 or TFM-15 are included) of amps. TFM-24/25, TFM-35, TFM-42/45, TFM-55, and TFM-75. Naturally the TFM standing for transfer function modified.

I know he didn't produce a lot of Silver Seven's, and I'd venture 1,000 was about right.

George Grand (of the Jersey Grands)"

Edit: The real thing: http://www.carveraudio.com/CarverChallenge.pdf

Jan Didden
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