John Curl's Blowtorch preamplifier part II - Page 1081 - 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 8th March 2011, 05:20 PM   #10801
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Is everybody ready to make Werner's circuit? I think it is a GREAT example of a DIY design. I couldn't do better, myself. Then, someone out there should compare the single stage VW design that we did earlier, with this design. I think that many here would be surprised. Of course, that is only my opinion, yet this is what I do for living, and I seem to do pretty well with it.
  Reply With Quote
Old 8th March 2011, 05:57 PM   #10802
работник
diyAudio Member
 
Rod Coleman's Avatar
 
Join Date: Jul 2004
Location: Warwickshire UK
Quote:
Originally Posted by john curl View Post
Is everybody ready to make Werner's circuit? I think it is a GREAT example of a DIY design. I couldn't do better, myself. Then, someone out there should compare the single stage VW design that we did earlier, with this design. I think that many here would be surprised. Of course, that is only my opinion, yet this is what I do for living, and I seem to do pretty well with it.
I am ready. I have already been using the JFET shunt-cascode stage almost exactly as drawn here, but with the opamp stage replaced by a triode.

It is low noise, using Lyra cartridges. The gain is flexible, and can be traded for low output impedance. And - the sound is superb, notably more enjoyable than any other solution I've tried.

And yes, with the input and output both referred to ground, the EMI rejection is excellent: you can hold telecom handsets or 50Hz transformers very close before perceptible pickup.

Also, since the instantaneous AND average supply current is constant, you can feed it from a current source, shunted by a resistor, for extra supply isolation.

Not to mention that it costs pennies to make DIY, and the board can be carved out of a piece of FR4 by hand.
  Reply With Quote
Old 8th March 2011, 06:05 PM   #10803
работник
diyAudio Member
 
Rod Coleman's Avatar
 
Join Date: Jul 2004
Location: Warwickshire UK
O, and yes, I use the K369. They are perfectly low enough noise in my application, and you don't even need to run them at Idss to get it: a small source resistor brings them under better control.
  Reply With Quote
Old 8th March 2011, 06:21 PM   #10804
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by Steve Eddy View Post
Huh?

Kevin's selling the LL1931 and 1933 for $225.00 and $185.00 respectively.

se
Those are "each." I think John was talking about "per pair."
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  Reply With Quote
Old 8th March 2011, 09:08 PM   #10805
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally Posted by SY View Post
Those are "each." I think John was talking about "per pair."
The only people crazy enough to pay that much for a single pair are the Japanese.

And what's produce have to do with transformers?

se
__________________
The Audio Guild
  Reply With Quote
Old 8th March 2011, 09:52 PM   #10806
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by Steve Eddy View Post
And what's produce have to do with transformers?
Excellent quality isn't cheap, but once one reaches a certain level, additional money is just for fashion. Hey, go for the Jensen at $500 the pair. It's gotta be 20% better than Lundahl and 40% better than Sowter!
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  Reply With Quote
Old 8th March 2011, 10:03 PM   #10807
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Jensen is even more expensive? Good to know.
  Reply With Quote
Old 8th March 2011, 10:08 PM   #10808
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Let's forget transformers for the moment, everybody. It is obvious that there are no transformer experts here, and most can't tell the difference between good ones.
Let's talk about cost effective phono reproduce design, instead. Werner's basic circuit was also in the JC-80, designed about 30 years ago. Just goes to show that good designs keep their reputation, even over time. We got 'preamp of the year' in Japan. Try for that, you amateurs! '-)
  Reply With Quote
Old 8th March 2011, 10:35 PM   #10809
gpapag is offline gpapag  Greece
diyAudio Member
 
gpapag's Avatar
 
Join Date: Nov 2002
Location: Athens-Greece
Quote:
Let's forget transformers for the moment, everybody. It is obvious that there are no transformer experts here, and most can't tell the difference between good ones.
Let's talk about cost effective phono reproduce design, instead. Werner's basic circuit was also in the JC-80, designed about 30 years ago. Just goes to show that good designs keep their reputation, even over time. We got 'preamp of the year' in Japan. Try for that, you amateurs! '-)

YouTube - Monty Python - The man who is alternately rude and polite

Regards
George
__________________
["Second Law is a bitch." - SY] ["The Road To Heaven:Specify the performance & accept the design. The Road To Hell:Specify the design & accept the performance"-Bruno Putzeys]
  Reply With Quote
Old 8th March 2011, 10:38 PM   #10810
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by john curl View Post
Let's forget transformers for the moment, everybody. It is obvious that there are no transformer experts here, and most can't tell the difference between good ones.
OK, we'll continue to look at the ground and drool.
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  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 11:05 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