John Curl's Blowtorch preamplifier part II - Page 2715 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

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
Reply
 
Thread Tools Search this Thread
Old 2nd September 2012, 08:29 PM   #27141
morinix is offline morinix  United States
diyAudio Member
 
Join Date: Jun 2006
Audio design is like taking a trip. All the fun is in the travel to the destination not the destination itself. If JC gave full plans to build a Blowtorch then there would be no travel just destination.

Sycophantic enough for you MR Wood?
__________________
Robert
Lounge Audio
  Reply With Quote
Old 2nd September 2012, 08:32 PM   #27142
morinix is offline morinix  United States
diyAudio Member
 
Join Date: Jun 2006
Personally I think the power supply JC used on the Blowtorch is more than half of the secret. Yet everyone keeps hounding JC for the amplifier topology.
__________________
Robert
Lounge Audio
  Reply With Quote
Old 2nd September 2012, 08:45 PM   #27143
zman01 is online now zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Quote:
Originally Posted by john curl View Post
My test procedure is LONG TERM LISTENING TESTS.
Quote:
Originally Posted by Joshua_G View Post
This is also my way of evaluating sound quality, as I elaborated above.
Quite a few times I tried a piece of gear on my setup that sounded good at first, but after a while, after few listening sessions on consecutive days, some flaws in the sound quality emerged.
+1. I also find it difficult to make quality subjective judgements based on short sessions.
  Reply With Quote
Old 2nd September 2012, 08:47 PM   #27144
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by morinix View Post
Personally I think the power supply JC used on the Blowtorch is more than half of the secret. Yet everyone keeps hounding JC for the amplifier topology.
In high quality, or SOTA, audio gear, everything counts.
The same goes for setting up high quality, or very 'musical', audio setup everything count. It can be known only by experimenting, by trying various options.
It looks to me unwise to spend a lot of money on the gear itself and no money at all on electricity treatment to the setup, or acoustic treatment, or vibration absorption and so on.
  Reply With Quote
Old 2nd September 2012, 08:49 PM   #27145
diyAudio Member
 
QSerraTico_Tico's Avatar
 
Join Date: Oct 2004
Default Wrong

Quote:
Originally Posted by morinix View Post
Personally I think the power supply JC used on the Blowtorch is more than half of the secret. Yet everyone keeps hounding JC for the amplifier topology.
Wrong, it's bad and hampers dynamics.
  Reply With Quote
Old 2nd September 2012, 09:29 PM   #27146
bcarso is offline bcarso  United States
diyAudio Member
 
Join Date: May 2005
Location: Canoga Park, California
Quote:
Originally Posted by morinix View Post
Audio design is like taking a trip. All the fun is in the travel to the destination not the destination itself. If JC gave full plans to build a Blowtorch then there would be no travel just destination.

Sycophantic enough for you MR Wood?
I didn't find that the least bit sycophantic Robert.
  Reply With Quote
Old 2nd September 2012, 10:27 PM   #27147
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Joshua_G View Post
Hi John,
I haven't heard any good audio product from any of your critics.
Really? Do you mean everything that you heard with AD chips inside was not good, including records that were made using designed by Scott Wurcer ICs?
__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 2nd September 2012, 10:53 PM   #27148
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by Wavebourn View Post
Really? Do you mean everything that you heard with AD chips inside was not good, including records that were made using designed by Scott Wurcer ICs?
I referred to the gear I have at home, or playback gear I heard in various places. I have no idea what gear was used in the recording/mixing/mastering.
  Reply With Quote
Old 3rd September 2012, 01:09 AM   #27149
morinix is offline morinix  United States
diyAudio Member
 
Join Date: Jun 2006
Quote:
Originally Posted by bcarso View Post
I didn't find that the least bit sycophantic Robert.
__________________
Robert
Lounge Audio
  Reply With Quote
Old 3rd September 2012, 01:17 AM   #27150
diyAudio Member
 
Join Date: Aug 2012
Anybody who claims that they can hear a pre amp looses me instantly.
The only pre amp I have ever heard was one that featured a 47k resistor directly in series with the phono input, and very poor psrr, so it both hissed and hummed.

I remember an audio pundit popular at the time saying that if you, "listened through", the hiss you could hear the superior quality of the design.
I being a simple sort of a person, asked why should one do that? why just not have them there in the first place.

Another pre amp did have hiss that was caused by a Zener used in the power supply. Replacing the Zener with a led referenced two transistor regulator fixed that.
Since then I have built several pre amps, and using the simple rule not to put high value resistors in series with the signal and to use a quiet power supply and a circuit with good psrr I haven't heard the difference in one since.
rcw
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 05:16 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2