John Curl's Blowtorch preamplifier part II - Page 3143 - diyAudio
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Old 14th December 2012, 02:46 AM   #31421
wahab is offline wahab  Algeria
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Quote:
Originally Posted by john curl View Post
We made hybrids by substituting a jfet pair for the 5535 input stage and sold them to Wilson Audio for their performance EQ ckts.

It was established then that it was worth the effort to do so.
You established that at the time there was no jfet inputs op amp
with caracteristics as good as the 5534 set apart the input impedance
and perhaps noise to a lesser extent....
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Old 14th December 2012, 02:48 AM   #31422
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Default LMH6629

Very nice opamp too

http://www.ti.com/lit/ds/snosb18e/snosb18e.pdf
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Old 14th December 2012, 02:53 AM   #31423
wahab is offline wahab  Algeria
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Originally Posted by EDDELARUE View Post
Nice , but +-5.5V max supply voltage.....
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Old 14th December 2012, 02:58 AM   #31424
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Originally Posted by wahab View Post
For decades it sounded very good for many ears that currently
find it "bad sounding"...
It s not like ears were upgraded like an AP1--->AP2 over 30 years.....
Overall quality had increased, exigence accordingly.
I never used-it since more than 20 years.
In fact, it is not so bad sounding in absolute, it is just not transparent, heavy transients, not fast enough.
Quote:
Originally Posted by wahab View Post
Nice , but +-5.5V max supply voltage.....
It is a long work, as i said, to find a part which feat all the needs, yes.
When it is not the supply, it is a single where you want double, or the package you don't want etc..
There is a lot of current feedback @ AD too.
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Last edited by Esperado; 14th December 2012 at 03:06 AM.
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Old 14th December 2012, 03:03 AM   #31425
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Originally Posted by wahab View Post
Nice , but +-5.5V max supply voltage.....
With THX certified power amplifiers, it's more than you are likely to need.

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Old 14th December 2012, 03:04 AM   #31426
Jay is offline Jay  Indonesia
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Originally Posted by wahab View Post
For decades it sounded very good for many ears that currently find it "bad sounding"...
I think 5534 is still like it was. May be we just now pay attention to its different quality aspect. First because this other aspect must be learned (not easily). Second because we learn about this aspect from newer/modern devices (where we found other opamps that don't sound like 5534 ON that aspect but may be as good at what we know 5534 is good at).
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Old 14th December 2012, 03:10 AM   #31427
a.wayne is offline a.wayne  United States
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Originally Posted by kgrlee View Post
Wayne, which of JC's illustrious designs do you have?

You need zillion V/us to do well in the Quan PIM test. One day, JC will conduct Quan on Blowtorch and we'll see how a truly 'hand carved from solid Unobtainium by virgins' product performs.

If we're REALLY lucky, we might be able to see the results of a Blind Listening Test of this against an evil 4558 device too.

In the meantime, JC has some Hirata test results on Blowtorch.
Currently none , most recently Parasound Halo a21 , fact is i can hear and critique Johns work , i cant with ESP , i cant agree or disagree with his Op-amp statement..

Last edited by a.wayne; 14th December 2012 at 03:12 AM.
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Old 14th December 2012, 03:15 AM   #31428
Jay is offline Jay  Indonesia
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Originally Posted by a.wayne View Post
Currently none , most recently Parasound Halo a21 , fact is i can hear and critique Johns work , i cant with ESP , i cant agree or disagree with his Op-amp pre-amp ....
Christophe has mentioned the opamp type, and he assumed that you know how to make a good enough power supply and layout.

And I guess you have heard those THS opamps so if you think they are not as good as discrete, or still have that "opamp sound" then for me enough to conclude that Christophe cannot "hear" it.
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Old 14th December 2012, 03:24 AM   #31429
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Originally Posted by Jay View Post
And I guess you have heard those THS opamps so if you think they are not as good as discrete, or still have that "opamp sound" then for me enough to conclude that Christophe cannot "hear" it.
What do you name "opamp sound" ? This tiny sound with a lack of body, or this sound under a cover ? I hate them.
Again, i do not listen to the "sound" of preamps, i compare them with wires.
May i remember-you a previous argument ? Most of the records you love (no "opamps sound") are recorded and mixed with hundreds of OPAs.
But, you know, i use more often tubes mikes preamps than solid states one. They are not transparent, but they are nice sounding, and hot.
I use fast solid state for some percussions, part of drums and some female voices..
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Last edited by Esperado; 14th December 2012 at 03:35 AM.
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Old 14th December 2012, 04:13 AM   #31430
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Originally Posted by a.wayne View Post
Currently none , most recently Parasound Halo a21 , fact is i can hear and critique Johns work , i cant with ESP , i cant agree or disagree with his Op-amp statement..
Can you tell us why you got rid of the A21?
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