John Curl's Blowtorch preamplifier part II - Page 2934 - diyAudio
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Old 15th November 2012, 06:03 PM   #29331
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Default SCH

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Originally Posted by john curl View Post
OF COURSE, ANADIGIT! '-)
Could you tell me about SCH ?
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Old 15th November 2012, 06:07 PM   #29332
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No SCH for Blowtorch.
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Old 15th November 2012, 06:27 PM   #29333
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Originally Posted by miklos View Post
I wouldn't be able to buy it anyway, but you can be sure that pot in the Blowtorch is a good one.
They're TKD stepped attenuators.

Click the image to open in full size.

se
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Old 15th November 2012, 06:36 PM   #29334
miklos is offline miklos  Canada
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Here's some pages, reply's worth to read about the CTC pre amp , resistors and pots

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-2260.html

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-2261.html

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-2807.html

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-393.html

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-378.html

[url]http://www.diyaudio.com/forums/analog-line-level/146693-john-curls-blowtorch-preamplifier-part-ii-380.html

[url]http://www.diyaudio.com/forums/solid-state/71189-john-curls-blowtorch-preamplifier-992.html
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Last edited by miklos; 15th November 2012 at 06:42 PM.
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Old 15th November 2012, 07:01 PM   #29335
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Quote:
Originally Posted by miklos View Post
Here's some pages, reply's worth to read about the CTC pre amp , resistors and pots
Wow, miklos, you are a team all by yourself. Thanks a lot.
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Old 16th November 2012, 06:30 AM   #29336
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Long before Vol 4 of Linear Audio came out, i said here that there was plenty of reason to think very low distortion was audible. I did my own distortion threshold tests and found that we needed AT LEAST .01% was max distortion to design for. And because we listen to a whole system, we needed products with -100db or better in each so the total of the entire system was below threshold. Well, Vol 4 shows even lower thresholds are detectable. This puts a new light on things... about our equipment and about listening tests.

Part of this is what we started to talk about earlier... JC has been very aware and designs with harmonics weighting towards the higher harmonics being more important and more detectable.

I would like JC to talk more about his designs and what/how they were developed with this in mind. Thx-RNMarsh

Last edited by RNMarsh; 16th November 2012 at 06:33 AM.
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Old 16th November 2012, 06:39 AM   #29337
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"Part of this is what we started to talk about earlier... JC has been very aware and designs with harmonics weighting towards the higher harmonics being more important and more detectable.

I would like JC to talk more about his designs and what/how they were developed with this in mind. Thx-RNMarsh"

That would be great!
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Old 16th November 2012, 08:44 AM   #29338
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I remember that the pot was costing about $250.

Gajanan Phadte
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Old 16th November 2012, 09:39 AM   #29339
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Originally Posted by RNMarsh View Post
I did my own distortion threshold tests and found that we needed AT LEAST .01% was max distortion to design for. And because we listen to a whole system, we needed products with -100db or better
How can-you explain we can afford a distortion of loudspeakers (for the best of them) at -50db (0.2%), in the same time ?
I believe harmonic distortion is not such a big problem, as it change only the tonal composition of the instruments and sound sources in a very natural way. I worry much more about IM, as it adds other sounds, not correlated at all, bringing confusion between sources.
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Last edited by Esperado; 16th November 2012 at 10:06 AM.
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Old 16th November 2012, 10:28 AM   #29340
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Some of the SE tube amps has 50 - 60dB more distortion and people loving them.
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