NP's first Single-Ended Class A amplifier using BjT's biased by a CCS - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 25th March 2011, 11:15 PM   #1
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Default NP's first Single-Ended Class A amplifier using BjT's biased by a CCS

about
http://www.passlabs.com/pdfs/articles/seclassa.pdf
I read follow:
In 1977 I designed and published in Audio Magazine a single-ended
Class A amplifier using bipolar followers biased by a constant current
source. A considerable number of amateurs have built the device, rated
at 20 watts output, and many have commented on its unique sonic
signature. It is one of the very few examples of a solid state single-
ended output stage available.


Which audio magazine? Are this paper online?
Who knows the URL?
  Reply With Quote
Old 25th March 2011, 11:26 PM   #2
diyAudio Member
 
Join Date: Jan 2005
Location: Østfold
Is it this one?

http://www.passdiy.com/pdf/classa_amp.pdf
__________________
Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...
  Reply With Quote
Old 25th March 2011, 11:36 PM   #3
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by Peter M. View Post
I think, yes - thank you very much. Because there isn't a exact name by this amp project like "ZEN" or "Death of ZEN" it is hard to find - if at all, only by chance.
Construct A Class-A Amplifier

Who knows the title of the audio magazine at those days ?? Was it the MJ magazine mentioned about
MJ Magazine (formerly Musen to Jikken) - Yearly Index from 1924 - 2009 wanted

Last edited by tiefbassuebertr; 25th March 2011 at 11:40 PM.
  Reply With Quote
Old 25th March 2011, 11:39 PM   #4
diyAudio Member
 
Join Date: Sep 2006
Location: Santa Rosa Beach, FL
Peter M. Re: Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...

I discovered a while back it's always better to use a FRIEND'S FINGERS to check if there still is voltage left in a capacitor....... or a friend's cat.....

  Reply With Quote
Old 25th March 2011, 11:41 PM   #5
Banned
 
Join Date: Nov 2006
Whatever you do, don't use your tongue
  Reply With Quote
Old 25th March 2011, 11:53 PM   #6
diyAudio Member
 
Join Date: Jan 2005
Location: Østfold
Quote:
Originally Posted by tiefbassuebertr View Post
I think, yes - thank you very much. Because there isn't a exact name by this amp project like "ZEN" or "Death of ZEN" it is hard to find - if at all, only by chance.
Construct A Class-A Amplifier

Who knows the title of the audio magazine at those days ?? Was it the MJ magazine mentioned about
MJ Magazine (formerly Musen to Jikken) - Yearly Index from 1924 - 2009 wanted

You`re welcome
__________________
Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...
  Reply With Quote
Old 25th March 2011, 11:54 PM   #7
diyAudio Member
 
Join Date: Jan 2005
Location: Østfold
Quote:
Originally Posted by CanAm Man View Post
Peter M. Re: Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...

I discovered a while back it's always better to use a FRIEND'S FINGERS to check if there still is voltage left in a capacitor....... or a friend's cat.....

Haha, I`ll try that next time
__________________
Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...
  Reply With Quote
Old 25th March 2011, 11:55 PM   #8
diyAudio Member
 
Join Date: Jan 2005
Location: Østfold
Quote:
Originally Posted by Melon Head View Post
Whatever you do, don't use your tongue
I`ll try to remember that
__________________
Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...
  Reply With Quote
Old 26th March 2011, 12:02 AM   #9
diyAudio Member
 
Join Date: Sep 2006
Location: Santa Rosa Beach, FL
Remember, though, if you elect to use your friend's cat, this might only work for nine times--before you need to find another cat.

It's all a function of joules, ergs, and skin resistance.....
  Reply With Quote
Old 26th March 2011, 01:03 AM   #10
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
That article appeared in Audio Magazine in 1977, as I
recall. It is listed in the article downloads as Pass Labs
as the A20

Attached Images
File Type: gif A20_P00.gif (144.9 KB, 404 views)
  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
Gold plated TO3 BjT's from the late 50's for Single Ended Pure Class-A Power Audio tiefbassuebertr Pass Labs 4 24th April 2011 03:42 PM
813 RCA amplifier - 25w, class A1, single ended,2 tubes,Rout~1ohm audiodesign Tubes / Valves 5 19th September 2010 08:34 PM
CCS Biased Class A davidallancole Solid State 8 11th February 2006 05:51 PM
class A single ended darkfenriz Solid State 16 21st January 2005 08:22 AM
Anyone play with the Zen Single-Stage Single-Ended Class A? Rino odorico Pass Labs 13 29th August 2002 10:01 AM


New To Site? Need Help?

All times are GMT. The time now is 08:45 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