Easiest to build class-A? - 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 23rd June 2008, 03:01 PM   #1
diyAudio Member
 
Doug Kim's Avatar
 
Join Date: Apr 2008
Location: Maryland, USA
Default Easiest to build class-A?

Hi all

I have been building tube amps quite some time, but I want to build a nice class-A solid state amp.
I searched the forum and there are (as always) many different opinions on which design sounds best.

Since sound quality can be quite personal, let me ask this question (which might have been asked already) differently.

Q: Which class-A solid state power amplifier design is easiest (but with decent sound quality accepted by many) to build?

By easiest I mean, easy to obtain parts, fewer parts and adjustment, stable after adjustment, etc.

Power about 10W or up will be fine, and the total cost will be nice if it's 3-digit range.

Link to the schematic and tips will be great also.

Thanks in advance.

Doug
  Reply With Quote
Old 23rd June 2008, 03:56 PM   #2
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
JLH amp

look here or go here : http://www.tcaas.btinternet.co.uk/
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 23rd June 2008, 04:46 PM   #3
diyAudio Member
 
Doug Kim's Avatar
 
Join Date: Apr 2008
Location: Maryland, USA
Quote:
Originally posted by Zen Mod
JLH amp

look here or go here : http://www.tcaas.btinternet.co.uk/

Thank you for the reply, ZM.

The JLH design is quite old, I wonder all the parts are readily available. I will look up Mouser or DigiKey.

Doug
  Reply With Quote
Old 23rd June 2008, 04:54 PM   #4
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally posted by Doug Kim



Thank you for the reply, ZM.

The JLH design is quite old, I wonder all the parts are readily available. I will look up Mouser or DigiKey.

Doug

you'll find plenty of information here and on A class site , regarding parts subs with more modern ones ;

you can also build any of Pass amps ( most recent ones F5 or F4 or any other Aleph ) - easy to construct , even with PtP ....

being a toob man - you'll not be scared with some temperature ......

anyway - considering that yoou want A class - you'll need substantial heatsinking ..... ya know - what is it - big Al gunk , which preserve these poor xsistors from poofing white smoke ........
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 23rd June 2008, 05:04 PM   #5
diyAudio Member
 
Doug Kim's Avatar
 
Join Date: Apr 2008
Location: Maryland, USA
Quote:
Originally posted by Zen Mod



you'll find plenty of information here and on A class site , regarding parts subs with more modern ones ;

you can also build any of Pass amps ( most recent ones F5 or F4 or any other Aleph ) - easy to construct , even with PtP ....

being a toob man - you'll not be scared with some temperature ......

anyway - considering that yoou want A class - you'll need substantial heatsinking ..... ya know - what is it - big Al gunk , which preserve these poor xsistors from poofing white smoke ........
Yeah, those big heat sinks... those make all the nice class-A amps (like the legendary Mark Levinson 20.5) look beautiful, but also made me stick to tube amp. I don't have proper tools to deal with metal pieces.
I'm thinking of using water-cooling computer CPU heatsinks... haha

Thanks again.

Doug
  Reply With Quote
Old 23rd June 2008, 05:10 PM   #6
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally posted by Doug Kim


Yeah, those big heat sinks... those make all the nice class-A amps (like the legendary Mark Levinson 20.5) look beautiful, but also made me stick to tube amp. I don't have proper tools to deal with metal pieces.
I'm thinking of using water-cooling computer CPU heatsinks... haha

Thanks again.

Doug

naah ....... you'll go nutz because of noise ....... if you wanna go that route - you need substantial radiator and slow & big fan(s) .......

sometimes is really easier with passive cooling , especially if you spend some time on junkyards , looking for them ....

try also at www.apexjr.com ; Steve often have some cheap elkos (for PSU) , and some heatsinks ;
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 23rd June 2008, 05:53 PM   #7
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
Doug,

For 10W, you should consider the Mini-A Aleph. Easy to source, build, and almost no adjustments of any kind.

Search the Pass Labs forum for the Mini-A schematic. There are versions that are both balanced and single ended.

Heat sinking is rather modest, and Choky said the apexjr website has perfect heatsinks for this type of project. Stay away from computer heatsinks or water cooling for something like this. It's more trouble than it's worth.

-David
  Reply With Quote
Old 24th June 2008, 07:09 AM   #8
GK is offline GK  Australia
Account disabled at member's request
 
Join Date: Jan 2006
Shameless plug:

http://users.picknowl.com.au/~glenk/K10A.HTM

DIY audio thread here:
The Kleinschmidt 10A

Design to be cheap and easy to build, and has that thermionic allure.......

I won’t comment on the “sound”, other than saying that its obvious lack of coloration over my 6B4G SET amplifier makes it much more pleasant to my ears.

Cheers,
Glen
  Reply With Quote
Old 24th June 2008, 11:20 AM   #9
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Default Death of Zen

http://sound.westhost.com/project36.htm
http://sound.westhost.com/project15.htm
and
http://www.tcaas.btinternet.co.uk/index-1.htm

Plenty of information.

/sreten.
  Reply With Quote
Old 24th June 2008, 03:49 PM   #10
jcx is online now jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
and there's the option of really minimizing parts count with gainclone/chipamps, just parallel 2 amps (in one dual package) with output sharing Rs and DC bias them to get a Class A output

Class output bias principle, needs modification for pwr chipamps which have min stable gians of >20:

Click the image to open in full size.

a single LM4780 package should easily go over 30W in one channel with a push-pull Class A bias, more with really good heatsinking
  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
6W, Class A, hopefully something I can build. :D keantoken Solid State 96 27th January 2011 12:28 PM
Help me Build a Class D alijoorabchi Class D 6 25th November 2006 04:19 PM
Simplest, Cheapest, easiest amp to build? Gsteg Solid State 14 4th March 2004 11:30 AM


New To Site? Need Help?

All times are GMT. The time now is 03:28 AM.


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