Are there any Class A designs which - 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 21st March 2009, 09:29 AM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: Toronto, ON, Canada
Default Are there any Class A designs which

have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard
  Reply With Quote
Old 21st March 2009, 10:47 AM   #2
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Re: Are there any Class A designs which

Quote:
Originally posted by 454Casull
have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard

Yes, just upscale an inductor loaded Zen 7.



Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 21st March 2009, 11:20 AM   #3
Banned
 
Join Date: Jan 2008
Blog Entries: 2
If you call valve amp OP stage impedance 'very high' then you can take any amplifier outputting 50W into 8 ohms and give it a high output impedance by feeding it into a reversed OP tx. If it was a class A amp with little or no negative feedback that would satisfy your conditions, n'est ce pas?

w

Have you actually got one of those hand cannons?
  Reply With Quote
Old 21st March 2009, 09:29 PM   #4
diyAudio Member
 
Join Date: Jan 2004
Location: Toronto, ON, Canada
Quote:
Originally posted by wakibaki
If you call valve amp OP stage impedance 'very high' then you can take any amplifier outputting 50W into 8 ohms and give it a high output impedance by feeding it into a reversed OP tx. If it was a class A amp with little or no negative feedback that would satisfy your conditions, n'est ce pas?

w

Have you actually got one of those hand cannons?
Nope. I live in Canada.
  Reply With Quote
Old 21st March 2009, 10:40 PM   #5
wg_ski is offline wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
Default Re: Are there any Class A designs which

Quote:
Originally posted by 454Casull
have a very high output impedance, no or little negative feedback, and can output ~50W per channel? If not, is it possible to design such an amp?

Thanks,

Howard

This sounds like what you want. You just need more bias and more cowbell, er, hexfet.

Zero Feedback Impedance Amplifiers
  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
Int. Rect. Class D reference designs stoc005 Class D 3 17th February 2007 04:51 PM
2 Designs for Class D Power Supply - Which One? bck2diy Class D 35 21st May 2006 12:37 PM
Quality of filter caps in class A or AB designs. beppe61 Parts 7 9th February 2006 08:19 PM
Class B designs with high fidelity? Joel Tubes / Valves 30 7th July 2003 10:35 AM
Why do so few designs use opamps working in class A? fmak Solid State 19 23rd May 2002 04:25 AM


New To Site? Need Help?

All times are GMT. The time now is 12:24 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