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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 20th January 2013, 07:35 PM   #33091
john curl is offline john curl  United States
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It is not appropriate to buy parts that I have no need for. Almost ANYTHING is cheaper than a Blowtorch. '-)
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Old 20th January 2013, 07:37 PM   #33092
PMA is offline PMA  Europe
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
I would not have used the AD844 in any case, because my designs are usually based on complementary jfets,
Nor AD825 is.
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Old 20th January 2013, 07:38 PM   #33093
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John Curl's Blowtorch preamplifier part II
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Originally Posted by Esperado View Post
Just order them on line ? It is less expensive than a Blowtorch :-)
I would be curious to have your feedback.
He wouldn't. "Pride and Prejudice"
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Old 20th January 2013, 07:39 PM   #33094
john curl is offline john curl  United States
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No, PMA, but I like the open-loop bandwidth and the subjective sound quality, and it uses a jfet input, which is the best that I can get from IC's. But you know that, don't you?
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Old 20th January 2013, 07:43 PM   #33095
john curl is offline john curl  United States
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If anyone here would look at the schematics that I have put forth on this thread in the last year or so, they would discover a number of designs that use a dual jfet input and bipolar transistors for the rest of the design, unless I can also use mosfets instead. I have been designing this way since the Levinson JC-2 phono stage. It is not my 'best' effort, but it is easy to do, and works pretty well.
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Old 20th January 2013, 07:53 PM   #33096
john curl is offline john curl  United States
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Examples:
Attached Images
File Type: jpg transamp.jpg (439.0 KB, 164 views)
File Type: jpg tex3.jpg (276.2 KB, 157 views)
File Type: jpg old phono1.jpg (292.3 KB, 157 views)
File Type: jpg pro amp module.jpg (569.9 KB, 156 views)
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Old 20th January 2013, 08:03 PM   #33097
Esperado is offline Esperado  France
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Quote:
Originally Posted by john curl View Post
which is the best that I can get from IC's.
How-can-you know if you don't try ?
And what about Jfet input if you don't need high Z ?

Last edited by Esperado; 20th January 2013 at 08:13 PM.
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Old 20th January 2013, 08:05 PM   #33098
john curl is offline john curl  United States
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Charles Hansen has already tried it in his product line, and now does not use it.
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Old 20th January 2013, 08:14 PM   #33099
elektroj is offline elektroj  Europe
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Stop trolling, guys ...
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Old 20th January 2013, 08:39 PM   #33100
Esperado is offline Esperado  France
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John, it is very strange to see-you so stuck on your definitive convictions. All the real progress i had made in my audio knowledge was always due to extensive questioning and 180°turns.
Listening to (valuable) people with opposite point of view.
Of course, we all tend to make definitive laws of thinks witch 'works'( in a given environment)... until we discover it was not a so 'general' or 'absolute' law.
"What were onces habits are now vices" would had say the Doobies, paths that lead to paradise are multiple and it is fun to walk in new landscapes.
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