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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 8th March 2013, 09:49 PM   #36491
gpapag is offline gpapag  Greece
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by vacuphile View Post
it also goes to show that the link between sound quality and musical enjoyment is weak at best.
My kind of man! (and you will not be allowed to post here again )

George
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Old 8th March 2013, 10:02 PM   #36492
elektroj is offline elektroj  Europe
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Originally Posted by jneutron View Post
...playin the ttables allowed far more "opportunities" than being a geek.
Indeep
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Old 8th March 2013, 10:06 PM   #36493
Kindhornman is offline Kindhornman  United States
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John Curl's Blowtorch preamplifier part II
All you had to do was be part of the sound crew and be able to get back stage and you were in with the hangers on! I don't think that it took much, just a little more than being a skinning guitar player...........
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Old 8th March 2013, 10:15 PM   #36494
simon7000 is offline simon7000  United States
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Originally Posted by gpapag View Post
JC is not a sweetheart either. Nor he is pushed and dragged to post here. It is his choice. It is a technical forum. The objective is technical not personal.



Well, this “level of problem” is the reality. An MC or MM pre has to work with a given signal.
If the analysis of the input signal transforms it into an “unacceptable problem”, some should start thinking differently. Hi end wording of subsequent audible results, doesn’t provide a remedy.



I love hitting the ENTER key hard and speaking some @#!!%& words between PC keyboard changes

George
JC is a barroom brawler. He enjoys a fight, but sometimes even he gets tired of the same old, same old.

I think you misread the second part. The LF energy is a problem he is trying to address in his design. If it were not able to be fixed he might have moved on to CD's. Note however he has mentioned he finds some mono recordings better than stereo, that may be due to the use of lateral information only and less LF noise. (But who knows for sure!)

As to computers, well I'd get banned for saying anything more...
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Old 8th March 2013, 10:19 PM   #36495
simon7000 is offline simon7000  United States
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Originally Posted by scott wurcer View Post
To show the effect of too few trials?
No, the experiment was to see how the student reported the results. (I went to a school with a very devious department of experimental Psych!)

Depends on your statistics bent. But the results actually would indicate significant deviation from the norm or evidence of ESP, even though the average is what was expected. Of course the actual explanation was the cards were marked and the subjects were coached to give those results.

Last edited by simon7000; 8th March 2013 at 10:28 PM.
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Old 8th March 2013, 10:24 PM   #36496
simon7000 is offline simon7000  United States
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BTY,

Here is what I was up to today. Measuring transformer leakage both loaded with a small power supply and unloaded.
Attached Images
File Type: jpg 2013_0309Misc0002.JPG (573.4 KB, 163 views)
File Type: jpg 2013_0309Misc0003.JPG (562.6 KB, 196 views)
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Old 8th March 2013, 11:24 PM   #36497
gpapag is offline gpapag  Greece
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John Curl's Blowtorch preamplifier part II
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Originally Posted by simon7000 View Post
I think you misread the second part. The LF energy is a problem he is trying to address in his design. If it were not able to be fixed he might have moved on to CD's.
OK Ed. My mistake.

From my old notes:
http://www.diyaudio.com/forums/attac...1&d=1362785172

Are there any drawbacks for placing this HP filter right at the MM pre input (or an MC pre input) ?

George
Attached Images
File Type: jpg Early HP filter.JPG (40.9 KB, 156 views)
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Old 8th March 2013, 11:27 PM   #36498
gpapag is offline gpapag  Greece
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by simon7000 View Post
BTY,

Here is what I was up to today. Measuring transformer leakage both loaded with a small power supply and unloaded.
And the winner is.... ?

George
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Old 9th March 2013, 12:32 AM   #36499
bcarso is offline bcarso  United States
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Originally Posted by gpapag View Post
OK Ed. My mistake.

From my old notes:
http://www.diyaudio.com/forums/attac...1&d=1362785172

Are there any drawbacks for placing this HP filter right at the MM pre input (or an MC pre input) ?

George
Codd's piece (sorry couldn't resist) will misterminate a typical MM cartridge, for which the typical 47k has most of its effect at high frequencies. So you will already be well-below that resistance just due to the 22k shown.
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Old 9th March 2013, 12:57 AM   #36500
simon7000 is offline simon7000  United States
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Originally Posted by gpapag View Post
And the winner is.... ?

George
George

So far I have only measured flux leakage. Still to be done is line noise pass through and AC balance.


The loser is the flatpak. The best may be r core and tortoid.

There is more than 2 millivolts across the chassis for the flatpak.
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