John Curl's Blowtorch preamplifier part II - Page 5575 - diyAudio
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Old 17th August 2014, 12:49 AM   #55741
fas42 is offline fas42  Australia
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Interesting how people have such a thing about noise - provided it doesn't modulate with the signal I have zero problems with such being part of the picture. What was the "uh-oh" moment in the review was:

Quote:
As the melody ascended there was also the slightest reduction of the upper-frequency glare that would sometimes slip into the picture with the JC 3.
That's what I would be chasing, there's the remanents of the real demon, for me at least ...
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Old 17th August 2014, 12:55 AM   #55742
a.wayne is offline a.wayne  United States
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IC glare? someone better wakeup Scotty ...
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Old 17th August 2014, 01:06 AM   #55743
rayma is offline rayma  United States
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Quote:
Originally Posted by john curl View Post
I haven't seen the review yet, Joachim. My copy of TAS should come soon.
It's on their web site:

Parasound JC 3+ Phono Preamp | The Absolute Sound
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Old 17th August 2014, 01:18 AM   #55744
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I said " With refinements ".
That can last
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Old 17th August 2014, 02:52 AM   #55745
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Ed Simon's suggestion made the greatest change in the + that reduced the noise.
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Old 17th August 2014, 03:26 AM   #55746
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Is that a secret or are you willing to share it ?
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Old 17th August 2014, 07:14 AM   #55747
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by keantoken View Post
I have always been fascinated with the inductance cancellation.
There's more info here and here about the negative inductance trick KSTR used in that thread he linked - theory, calculations etc. Don't be put off by the time machines and flux capacitors in the first link - it's just a bit of humour along the way, he gets to the point eventually.
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Old 18th August 2014, 02:23 AM   #55748
a.wayne is offline a.wayne  United States
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Another :

Chinook phono stage ..

http://www.avhub.com.au/images/stori...iew_lo_res.pdf
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Old 18th August 2014, 08:15 AM   #55749
gpapag is offline gpapag  Greece
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They emphasize the overload margin (although at 1kHz only) of this pre and I find this correct.
How is it that even today there are phono preamplifier specs that do not include max (*) input voltage (or overload margin ref some V).

George

(*)In the past, max input voltage was the voltage just before clipping, 1% to 3% THD area.
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Old 18th August 2014, 09:09 AM   #55750
SY is offline SY  United States
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Quote:
Originally Posted by gpapag View Post
They emphasize the overload margin (although at 1kHz only) of this pre
That's a problem. Different topologies have different dependence of overload on frequency. Likewise, different implementations have different recovery from clipping. That all needs to be specified.
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