Walt Jung(?) tube opamp - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 9th April 2003, 03:19 PM   #1
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Default Walt Jung(?) tube opamp

I found this opamp made of tubes in the Walt Jung "brick book". Just a little candy for the tube dudes.
Attached Images
File Type: jpg tubeopamp2.jpg (35.9 KB, 337 views)
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 9th April 2003, 03:38 PM   #2
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default ummmmm......

I count 8 bipolar transistors (and not even good ones) in this "tube" op amp. Kind of defeats the whole purpose doesn't it?
Q1 to Q4 are a folded cascode stage with another cascode stage on the bottom of it before somebody inevitably ask.
  Reply With Quote
Old 9th April 2003, 03:51 PM   #3
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
I think this was more like a design idea rather than a ready solution.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 9th April 2003, 03:52 PM   #4
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
I do not ask anything but inevitably complain that the thingie on the bottom looks damn close to a current mirror.

Regards

Charles
  Reply With Quote
Old 9th April 2003, 03:55 PM   #5
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
I'm afraid Fred is right. The lower part is the load of the differential stage and the tubes are stealing current from the differential transistors and these transistors have their inputs connected to constant DC voltage.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 9th April 2003, 04:10 PM   #6
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default The current mirror...

Quote:
I do not ask anything but inevitably complain that the thingie on the bottom looks damn close to a current mirror.
They are a current mirror!!!

Cheers
__________________
Jorge
  Reply With Quote
Old 9th April 2003, 06:13 PM   #7
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Sorry, I didn't read to well, correct, folded cascode with current mirror as collector load at the bottom.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 9th April 2003, 06:21 PM   #8
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default Curiosity??

Hi paranders

For what is the out 2??...with a high open loop output impedance??
__________________
Jorge
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Thick book by Walt Kester and Walt Jung peranders Parts 9 19th August 2005 08:34 PM
Fat 976 pages Opamp book by Walt Jung, anyone who knows something about it? peranders Parts 4 7th July 2003 06:53 AM
Walt Jung Class A preamp leiade Solid State 150 2nd October 2002 05:41 PM
Walt Jung IC opamp/buffer combo vs. discrete? dorkus Solid State 4 2nd May 2002 10:40 PM
Walt Jung artical phil Solid State 2 6th November 2001 04:39 PM


New To Site? Need Help?

All times are GMT. The time now is 11:33 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