John Curl's Blowtorch preamplifier part II - Page 3288 - diyAudio
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Old 18th January 2013, 02:11 PM   #32871
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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 ?
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Old 18th January 2013, 02:12 PM   #32872
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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.
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Old 18th January 2013, 02:13 PM   #32873
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I don't do CD's. '-)
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Old 18th January 2013, 02:38 PM   #32874
SY is offline SY  United States
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Quote:
Originally Posted by Bonsai View Post
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."
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Old 18th January 2013, 02:57 PM   #32875
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Quote:
Originally Posted by john curl View Post
I don't do CD's. '-)
http://us.123rf.com/400wm/400/400/do...-en-studio.jpg
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Last edited by Esperado; 18th January 2013 at 03:02 PM.
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Old 18th January 2013, 04:50 PM   #32876
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SACD's or better, for me. '-)
Jan, just got Vol. 3, thanks.
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Old 18th January 2013, 04:53 PM   #32877
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Quote:
Originally Posted by john curl View Post
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.
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Last edited by Esperado; 18th January 2013 at 04:58 PM.
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Old 18th January 2013, 04:57 PM   #32878
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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.
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Old 18th January 2013, 05:04 PM   #32879
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Default rhetorical, much?

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?

Last edited by jcx; 18th January 2013 at 05:22 PM.
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Old 18th January 2013, 05:04 PM   #32880
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Default 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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