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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 11th December 2011, 10:16 PM   #19001
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
Wavebourn, don't you hear the difference in line cords?
Presumably, Wavebourn's amps have competent power supplies.
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Old 11th December 2011, 10:20 PM   #19002
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And mine don't.
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Old 11th December 2011, 10:22 PM   #19003
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
Wavebourn, don't you hear the difference in line cords?
When loaded on speaker impedance simulator?
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Old 11th December 2011, 10:23 PM   #19004
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
And mine don't.
I'm surprised at that admission- I would have guessed that you'd be fine at designing competent power supplies for your products.
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Old 11th December 2011, 10:29 PM   #19005
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You are wrong, SY. It is true that better designing power supplies DOES reduce the sensitivity to line cords, but it does NOT eliminate it. I am very proud of my power supplies, but the best thing that I did for the JC-3 was to put a 10uf cap across the input line to remove the power supply problems and probably power cord sensitivity, at least to the resolution of the JC-3, which is not infinite.
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Old 11th December 2011, 10:35 PM   #19006
Wavebourn is offline Wavebourn  United States
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John Curl's Blowtorch preamplifier part II
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Originally Posted by SY View Post
I'm surprised at that admission- I would have guessed that you'd be fine at designing competent power supplies for your products.
It is very challenging: in order to power amps with zero output resistance he would ned power supply with zero output resistance, powered through a zero resistance power cable from zero resistance outlet. But adding 0.1-0.5 Ohm resistor in series with speaker he allowed some resistance for power cable and outlet. Sounds quite scientific, right?
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Old 11th December 2011, 10:45 PM   #19007
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John Curl's Blowtorch preamplifier part II
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You are wrong, SY.
OK, so you can't design power supplies.

Sorry, I think you're being overly modest.
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Old 11th December 2011, 10:51 PM   #19008
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Quote:
Originally Posted by john curl View Post
Wavebourn, don't you hear the difference in line cords?
Possibly some designer are satisfied with only measurements, while skipping listening evaluations.
 
Old 11th December 2011, 10:55 PM   #19009
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John Curl's Blowtorch preamplifier part II
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Possibly some designer are satisfied with only measurements, while skipping listening evaluations.
Possibly you don't mean my humble person, Joshua?

As people know, I always calibrate measurements with listenings, and listenings with measurements. You know, it helps sometimes more than correlating thinkings with readings.
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Old 11th December 2011, 11:00 PM   #19010
Joshua_G is offline Joshua_G  Israel
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Quote:
Originally Posted by Wavebourn View Post
It is very challenging: in order to power amps with zero output resistance he would ned power supply with zero output resistance, powered through a zero resistance power cable from zero resistance outlet. But adding 0.1-0.5 Ohm resistor in series with speaker he allowed some resistance for power cable and outlet. Sounds quite scientific, right?
Last I heard, RF entering an amplifier via the power cord, spreads also by radiation, bypassing the power supply. But what do I know? I have no formal degree to backup any technical claim.

However I'm curious why Thorsten Loesch bothered to put a special AMR fuse in the CDP I purchased recently. Was the fuse chosen after certain measurements? Or may be after listening evaluations? Is that special fuse only for show? I doubt it, since most customers don't bother to take out the fuse and look at it.
 

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