push pull Vs single ended class A amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th July 2008, 12:23 PM   #1
diyAudio Member
 
Join Date: Mar 2008
Default push pull Vs single ended class A amp

hi,

i have read about class A amp. i undestand that single ended class A amp have less efficiency then Push pull class A.

which sound more sonic? Push pull or single ended?

thank you
michael
  Reply With Quote
Old 26th July 2008, 01:14 PM   #2
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Go for Balanced single ended with active current source loading Class-A using mosfets.
  Reply With Quote
Old 26th July 2008, 04:33 PM   #3
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Quote:
Originally posted by Workhorse
Go for Balanced single ended with active current source loading Class-A using mosfets.
I would go for class A push-pull mosfet ( like IRFP240 / IRFP9240 )

If we look at Nelson Pass ... the mosfet guru of this forum
he started out with Single Ended resistor loaded MOSFETs ( balanced )

But later on, he has frequently used PUSH-PULL Class-A.
Like for example in his F4 amplifier,
which is a schoolbook example how to make a very good Class A output

http://www.firstwatt.com/products/f4.htm

Quote:
F4 ... A Power Buffer:

Like everything else from www.firstwatt.com it is a unique amplifier.

It has
- no feedback and
- no voltage gain,
- only current gain.
__________________
lineup
  Reply With Quote
Old 26th July 2008, 04:52 PM   #4
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
I have my own taste of balanced single ended in class-A using all N-channel mosfets[no p-channel crap]I dont like complementary mosfets, because they are not complementary in reality due to vast difference in specs.

Even all my class-AB and Class-H amps also feature All N-channel output stage only
  Reply With Quote
Old 26th July 2008, 05:07 PM   #5
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Push-pull is the way to save an electricity.
__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 26th July 2008, 05:11 PM   #6
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
If you really want to save the energy then go for Class-D.
  Reply With Quote
Old 26th July 2008, 07:08 PM   #7
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
Why not try push-pull class A from 12V rails and run class G with 50V rails?
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 26th July 2008, 07:26 PM   #8
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally posted by Workhorse
If you really want to save the energy then go for Class-D.
A+C+C is close to class D, and is the best compromise between power consumption and sound quality I ever found. Imagine 5-bit D/A converter where each bit is also analog...
__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 27th July 2008, 08:54 AM   #9
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally posted by djk
Why not try push-pull class A from 12V rails and run class G with 50V rails?
Great........

  Reply With Quote
Old 27th July 2008, 02:53 PM   #10
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
"A+C+C is close to class D, and is the best compromise between power consumption and sound quality I ever found. "

I would tend to agree, what I am calling A+G is what you would call A+C.

AB+C+C is how the original Carver Cube (M400) ran; 25V, 50V, 80V. The lowest voltage and size of the heatsink (none!) prevented higher than AB bias. Efficiency on a resistive load was about 87.5% (as analyzed by Hsu when he was at MIT), and improved driving a reactive load line.

Most people don't need 80V rails, 50V rails may be adequate for all but the largest rooms or most inefficient speakers (it is only about 3dB less in any event).

12V biased to about 1A would allow about 10W in class A (6R nominal) before transitioning to the higher rails. For average listening the amplifier may never leave class A, and would still have 10dB of headroom for demanding program material.

The 25W of bias would require about a 1C heatsink for low temperatures, but this is no worse than what a typical 100W class AB would need (and 25W is what the 100W Hafler DH200 ran for bias, but only would deliver 0.5W/6R in class A).
__________________
Candidates for the Darwin Award should not read this author.
  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
Single-ended OR push-pull? kacernator Tubes / Valves 48 31st March 2008 02:50 PM
Single ended amp from class A push-pull Wavebourn Tubes / Valves 2 12th October 2007 09:14 PM
Is single ended Class A better than push-pull? okhifi Tubes / Valves 49 1st September 2005 07:26 PM
Parallel single ended or push-pull? Jeffy74 Tubes / Valves 6 12th February 2004 06:04 AM


New To Site? Need Help?

All times are GMT. The time now is 03:07 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