John Curl's Blowtorch preamplifier part II - Page 3288

Esperado · 18th January 2013, 02:11 PM

John, something would be interesting to allow us to get a physical idea of your mythic Blowtorch.
To record a sample of any CD, out of the analog out of your preferred player, and the same out of your Blowtorch and provide the files.
What do-you think ?

john curl · 18th January 2013, 02:12 PM

Here is an example of the JC-3 early prototype. Please note loading of AD797, and use of constant current jfets on output to give more Class A range.

john curl · 18th January 2013, 02:13 PM

I don't do CD's. '-)

SY · 18th January 2013, 02:38 PM

Quote:

Originally Posted by Bonsai

NO!!

John said very explicitly that it is, and that it's this supposed defect which relegates IC-based preamps to "mid-fi," unsuitable for discerning ears. I await either his supporting data or his "oops, I was mistaken, thanks for the correction."

Esperado · 03:02 PM

Quote:

Originally Posted by john curl

I don't do CD's. '-)

http://us.123rf.com/400wm/400/400/do...-en-studio.jpg

john curl · 18th January 2013, 04:50 PM

SACD's or better, for me. '-)
Jan, just got Vol. 3, thanks.

Esperado · 04:58 PM

Quote:

Originally Posted by john curl

SACD's or better, for me. '-)
Jan, just got Vol. 3, thanks.

SACD is not a CD ? You like to play on words, or what ?
The correct orthography is SA-CD and means Super Audio... CD.

john curl · 05:02 PM

To me, there is: CD, DVD 24/96, SACD, and now even higher sampling rates coming off the press. CD sucks. DVD and SACD, OK, and I hope for even better.
WHY would I bother with what I bother with in audio, if I was stuck with CD, only?

jcx · 05:22 PM

Quote:

SACD is not a CD ? You like to play on words, or what ?
The correct orthography is SA-CD and means Super Audio... CD.

no they're DVD with funny servo track coding for anti-piracy, 4x the bit rate of RedBook CD

with the additional fun of being single bit DSD - basically a "noise modulated" ~ MHz carrier >+ 6 dB re audio fs

the only way to get the 120 dB noise spec at 20 kHz is to use >5th order negative feedback in the noise shaping process

so of course it is considered "more analog sounding" - wasn't that easy to predict from the tech details?

RNMarsh · 05:11 PM

Take a wide band, high slew rate amplifier - implying low-med nfb circuit - and add a comparator to the I/O and feed the comparator output back into an amplifier input to cancel remaining distortion. Works very well, it seems from data shown. Some old guy from France named Christophe showed this in another DIYAudio forum. Very cool, IMO. Thx, RNMarsh

18th January 2013, 02:11 PM	#32871
Esperado diyAudio Member Join Date: Jul 2011 Location: France	John, something would be interesting to allow us to get a physical idea of your mythic Blowtorch. To record a sample of any CD, out of the analog out of your preferred player, and the same out of your Blowtorch and provide the files. What do-you think ? __________________ Christophe. Ultimate Protection

18th January 2013, 04:57 PM	#32878
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	To me, there is: CD, DVD 24/96, SACD, and now even higher sampling rates coming off the press. CD sucks. DVD and SACD, OK, and I hope for even better. WHY would I bother with what I bother with in audio, if I was stuck with CD, only? Last edited by john curl; 18th January 2013 at 05:02 PM.

18th January 2013, 05:04 PM	#32880
RNMarsh diyAudio Member Join Date: May 2012 Location: 2457 Cascade Trail; Cool, CA. 95614	cool idea dept - Take a wide band, high slew rate amplifier - implying low-med nfb circuit - and add a comparator to the I/O and feed the comparator output back into an amplifier input to cancel remaining distortion. Works very well, it seems from data shown. Some old guy from France named Christophe showed this in another DIYAudio forum. Very cool, IMO. Thx, RNMarsh Last edited by RNMarsh; 18th January 2013 at 05:11 PM. Reason: Very cool idea applied to audio -

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18th January 2013, 02:13 PM	#32873
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	I don't do CD's. '-)

18th January 2013, 04:50 PM	#32876
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	SACD's or better, for me. '-) Jan, just got Vol. 3, thanks.