John Curl's Blowtorch preamplifier part II - Page 561 - 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 10th August 2010, 06:12 PM   #5601
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
John Iverson worked for the military a great deal of the time. These amps were FIRST CLASS. He was the only circuit designer in my experience who awed me.
Oh, I have met 'engineers', physicists, and mathematicians who are impressive, but John Iverson was the best circuit designer I have ever known. He developed the complementary differential input stage in the late '60's, just as I did.
He made a full range loudspeaker with no moving parts, and as I recall, it took 3 of these same amps to drive it. Joan Baez singing 'Blue', sounded best through this loudspeaker, than any other I have ever heard. However, nothing else sounded quite as good. This speaker could bounce an image off a wall and you would think that the wall was the source of the sound.

Last edited by john curl; 10th August 2010 at 06:32 PM.
  Reply With Quote
Old 10th August 2010, 06:34 PM   #5602
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Stig Björge of Lyra has one of those amps perfectly restored so i can ask him hpw it compares today.
John, was that the Corona Wind speaker ?
I heard that his strain gauge cartridge was also ahead of it´s time.
i heard he misteriously disappeared one day.
  Reply With Quote
Old 10th August 2010, 06:37 PM   #5603
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
He was kidnapped from his living space and never seen again. It was not quite a 'corona wind' speaker, but something similar.
  Reply With Quote
Old 10th August 2010, 06:39 PM   #5604
pooge is offline pooge  United States
diyAudio Member
 
Join Date: May 2003
Location: Northern Va.
Quote:
Originally Posted by john curl View Post
Joan Baez singing 'Blue', sounded best through this loudspeaker, than any other I have ever heard.
Do you mean Joni Mitchell?
  Reply With Quote
Old 10th August 2010, 06:47 PM   #5605
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
No, Joan Baez. Vanguard mono vinyl, recorded around 1960. Tubes only.
  Reply With Quote
Old 10th August 2010, 06:53 PM   #5606
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Early Joan Baez is mesmerising. My wife sometimes asks me to play her on my system.
She does great charity work today. Her voice has changed a lot though.
  Reply With Quote
Old 10th August 2010, 07:04 PM   #5607
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
That is why the early Joan Baez is so special, and why we sometimes use is as a musical reference.
  Reply With Quote
Old 10th August 2010, 07:35 PM   #5608
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
good choice. i like Melanie too.
  Reply With Quote
Old 10th August 2010, 07:48 PM   #5609
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally Posted by janneman View Post
I like those square, lamp-lighted pushbuttons. Reminds me of a place I used to work, where they had the same type buttons.
Only different legends like 'Launcher", "Missile act", "Fire", and "Ripple F".
HA!

I'm curious now. What was "Ripple F"? Anything like a CRM-114 Discriminator?

se
__________________
The Audio Guild
  Reply With Quote
Old 10th August 2010, 08:27 PM   #5610
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Quote:
Originally Posted by john curl View Post
He was kidnapped from his living space and never seen again. It was not quite a 'corona wind' speaker, but something similar.
He sounds like Jim Bongiorno's doppleganger.

A Tribute to John G. Iverson - Genius inventor - kidnapped/killed by the NWO
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  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 09:55 PM.


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