NP's first Single-Ended Class A amplifier using BjT's biased by a CCS

tiefbassuebertr · 25th March 2011, 10:15 PM

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?

Peter M. · 25th March 2011, 10:26 PM

Is it this one?

http://www.passdiy.com/pdf/classa_amp.pdf

tiefbassuebertr · 10:40 PM

Quote:

Originally Posted by Peter M.

Is it this one?
http://www.passdiy.com/pdf/classa_amp.pdf

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

CanAm Man · 25th March 2011, 10:39 PM

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.....

Melon Head · 25th March 2011, 10:41 PM

Whatever you do, don't use your tongue

Peter M. · 25th March 2011, 10:53 PM

Quote:

Originally Posted by tiefbassuebertr

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

Peter M. · 25th March 2011, 10:54 PM

Quote:

Originally Posted by CanAm Man

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

Peter M. · 25th March 2011, 10:55 PM

Quote:

Originally Posted by Melon Head

Whatever you do, don't use your tongue

I`ll try to remember that

CanAm Man · 25th March 2011, 11:02 PM

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.....

Nelson Pass · 26th March 2011, 12:03 AM

That article appeared in Audio Magazine in 1977, as I
recall. It is listed in the article downloads as Pass Labs
as the A20

25th March 2011, 10:15 PM	#1
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	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?

25th March 2011, 10:26 PM	#2
Peter M. 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...

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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 02:42 PM
813 RCA amplifier - 25w, class A1, single ended,2 tubes,Rout~1ohm	audiodesign	Tubes / Valves	5	19th September 2010 07:34 PM
CCS Biased Class A	davidallancole	Solid State	8	11th February 2006 04:51 PM
class A single ended	darkfenriz	Solid State	16	21st January 2005 07:22 AM
Anyone play with the Zen Single-Stage Single-Ended Class A?	Rino odorico	Pass Labs	13	29th August 2002 09:01 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

25th March 2011, 10:39 PM	#4
CanAm Man 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.....

25th March 2011, 10:41 PM	#5
Melon Head Banned Join Date: Nov 2006	Whatever you do, don't use your tongue

25th March 2011, 11:02 PM	#9
CanAm Man 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.....