Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

John Curl's Blowtorch preamplifier
John Curl's Blowtorch preamplifier
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Closed Thread
 
Thread Tools Search this Thread
Old 4th May 2006, 01:00 PM   #1131
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Hi Chris,

the link to my website can be found below every of my posts. There is a <"www"> button that links directly to my website, since the year 2002 when I registered here
 
Old 4th May 2006, 01:35 PM   #1132
Terry Demol is offline Terry Demol  Australia
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by PMA
Terry,

apparently you are experienced in recording. How do you like Millennia Media preamp, how do you like Ed Meitner's products?

Regards,
Pavel
I have not used the Millenia personally, but have heard a few
recordings that were done with it, have heard wavs that were A/B'd
to other mic pre's, (gordon) spoken to engineers who have used
it, know someone who was previously involved with the company.

From this -non direct- information, I would cautiously say that the
Gordon (and others) are a better pre amp WRT sounding truthfull
but natural.

A friend reported Tom Jung tried his (my friends) own 0 x FB pre
against the Millenia and preferred it.

The circuit, and many others that follwed since, really owe much to
a fellow compatriot, Graham Cohens original design.

However, the Millenia certainly speaks for itself, I believe there are
10's of thousands of channels in use, you can't argue with that.

WRT Meitner, I have not tried his products, but a friend recently
had the 8 x ADC and 8 x DAC racks. They were the best he had
ever heard. Unfortunately didn't get time to check them out.

I have a lot of respect for Meitner, very smart guy.

WRT ADC's I think the grimmaudio box (by Putzeys and company)
is probably the one to get.

Cheers,

Terry
 
Old 4th May 2006, 01:57 PM   #1133
Terry Demol is offline Terry Demol  Australia
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by anatech
Hi Terry,

Can you give us something to work with on this? A description or partial schematic would work.

-Chris
Fully differential. We have quite a few design techniques that are
unique and get around typical open loop non linearities. So for
the moment we are keeping the lid shut. (sorry)

I can say that it is possible to get around 0.001% or sometimes
better wiith open loop if measurements are your king .

Also we tested quite a few front ends, many that measured very
similar, around 0.001% but sounded very different. Some did sound
quite inferior despite the good steady state measurement.

We also did many tests of purposly adding various combination
of even and odd harmonic content to the very low baseline
linearity. (take note Upupa) The results were enlightening and
somewhat contrary to many common belief.

And I am not, in any way detracting from Johns approach with
the Blowtorch, I believe it is excellent. As his clients have attested
to, getting to 0.00x% may not always be the primary goal. I believe
his product speaks for itself.

Cheers,

Terry
 
Old 4th May 2006, 02:35 PM   #1134
Terry Demol is offline Terry Demol  Australia
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by PMA
I am sure that most of you are aware of the fact that "sweet tube pleasant sound" is usually created during recording/mastering by selection of proper equaliser or DSP, all in solid-state circuits ....
Unfortunately, that is the over simplification of the century and
mostly wrong.

Most of the sweet tube sounds -are- sweet tube sounds of stuff
like Telefunken V72 mic pres etc. The pc plug-ins don't really do
the real thing justice.

Other popular coloration boxes are Neve SS pre amps. Pultec EQ's
the list is endless, but they are real boxes, some of them hand
built point to point wired.

The latest craze, apparently, is Germanium transistor based
mic pre's (chandler)

Also don't forget IP/OP coupling transformers.

Analog tape distortion (H3).

Plate reverbs... yummy


You may actually find it interesting that David Chesky uses almost
100% tube signal path (except for ADC) in his minimalist recordings.


This is really drifting from the threads intent and the subject can not
even remotely be covered here. However it is a subject many of us
would benefit from. Very interesting, especially when you actually
hear what some of it does. Very very difficult to make
generalisations about this stuff.

There is a great book I read recently called "Temples of Sound",
about all the original recording studios and gear used in them.


Cheers,

Terry
 
Old 4th May 2006, 02:38 PM   #1135
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Terry,

everybody who has worked with low distortion stuff knows that even 0.001% THD measuring devices do sound different. A good example is OPA134 and OPA627 as a unity gain buffer, though below the declared number they do sound different. Spectral measurement of THD is only one small element of wide set of needed measurements. What I declare is that vera low THD is necessary, but not satisfactory condition of a good amplifier.

Regards,
Pavel
 
Old 4th May 2006, 02:44 PM   #1136
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
Simple is better. Thats a fact. Apart from the fact that simple circuits require more ideal working conditions. So to to me it where you spend your effort. making circuits with superb noise rejection or you spend your time making ideal power supplies. Anyway This is an exelent thread to follow for a non skilled audio designer addict. Much knowledge to gain and only time to spend.
Love it!!! thanks for postings and please don't let religious extremisem set the agenda

Michael Børresen

www.eben.dk
 
Old 4th May 2006, 02:56 PM   #1137
Terry Demol is offline Terry Demol  Australia
diyAudio Member
 
Terry Demol's Avatar
 
Join Date: Apr 2002
Location: *
Quote:
Originally posted by PMA
Terry,

everybody who has worked with low distortion stuff knows that even 0.001% THD measuring devices do sound different. A good example is OPA134 and OPA627 as a unity gain buffer, though below the declared number they do sound different. Spectral measurement of THD is only one small element of wide set of needed measurements. What I declare is that vera low THD is necessary, but not satisfactory condition of a good amplifier.

Regards,
Pavel
Yes, agreed.

Cheers,

Terry
 
Old 4th May 2006, 02:58 PM   #1138
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Quote:
Originally posted by MiiB
Simple is better. Thats a fact. Apart from the fact that simple circuits require more ideal working conditions. So to to me it where you spend your effort. making circuits with superb noise rejection or you spend your time making ideal power supplies.
Michael,

could you please kindly tell an example of a well-known simple and excellent sounding amp or preamp? I do belive that it would not be the ZEN V1 or something similar, as then we can hardly find common language.

Regards,
Pavel
 
Old 4th May 2006, 03:23 PM   #1139
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
You didn't get it
Simple designs moves the requirement to the PSU. And for a simple circuit that sounds marvelous just look at a risistor biased 6H30 tube. Simplicity in all its beauty. and well sounding and terrbly distorted. As you pointed out earlier low distortion does not equal great sound. There's more to the equation than that. You know that!! but you also claim that low distorion is a requirement for good sound and then in my book you write solutions that has less tha low distortion. In an earlier post I said were are not able to measure good sound we must hear it. And we can do that regardless of the poor speakers we use. So again we must solder and experiment and listen!!
I belive that is all the blowtorch is about.

Michael Børresen

www.Raidho.dk
 
Old 4th May 2006, 03:39 PM   #1140
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Michael,

what you wrote about me is only a part of truth. I often listen to classical music and I do not like it through tube amps. I can even tell (recognize) that recording was done through tube preamp. Me personally I am bored by euphonic sameness of the tube sound.

This does not say anything against your taste. I believe you like it and I respect it.

I said that low distortion is not the only satisfactory condition for a good sound, but id did not mean I liked the tube sound.

Regards,
Pavel
 

Closed Thread


John Curl's Blowtorch preamplifierHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 06:41 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki