A40 - 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 27th December 2007, 04:44 PM   #1
diyAudio Member
 
Join Date: Nov 2003
Location: Portland
Default A40

I found this piece at the local electronic junk store, thought that it was really cool, and that I would be the only one to have such a wierd device with the heat sinks turned toward the center. Then I saw a very similar piece in a 1978 Nelson Pass article about the A40 amp. Anybody know what it is?
Attached Images
File Type: jpg a40.jpg (90.2 KB, 587 views)
  Reply With Quote
Old 27th December 2007, 04:48 PM   #2
gl is offline gl  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Sierra Foothills - California
It's a forced air heatsink assembly. You mount a fan on one end to blow air through it. Probably a 4" fan would be my guess.

Graeme
  Reply With Quote
Old 27th December 2007, 05:02 PM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Portland
It already has a fan on the other side, but what was the thing made to do?

Thanks
Attached Images
File Type: jpg a40b.jpg (89.1 KB, 485 views)
  Reply With Quote
Old 27th December 2007, 06:18 PM   #4
gl is offline gl  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Sierra Foothills - California
First of all I suspect that the heatsink assembly you show is only part of some other larger assembly. What was the purpose of that assembly you ask? - it's impossible to know. If I had to guess I would say it was 1) part of a large analog power supply or 2) the output stage for a large amplifier. Keep in mind that there are lots of different types of amplifiers and only some of them are suitable for audio. To get a better idea you would need to sketch out the circuit of what you have, then look up the power transistor specs.

I think you had it nailed in your first post. The heatsink alone would make a great basis for an A40! It's unlikely that you could use the whole thing as the output section of a first class amp. I've never been that lucky with my surplus store finds. But then again - you might be.

Graeme
  Reply With Quote
Old 27th December 2007, 07:18 PM   #5
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
It looks like one of mine, but it's not.

  Reply With Quote
Old 27th December 2007, 07:41 PM   #6
diyAudio Member
 
zeonrider's Avatar
 
Join Date: Mar 2004
Location: Belgrade RS
Default Hi !

It look like an old voltage regulator (line), from old Server-psu.

Good old gear!

I be able to see similar staf on the local scrapyard, very cheap about 10 Euro/14$

Fan is 120x120 (4,7244").

Mr.Nelson it is older than you !


Regards zeoN_Rider
  Reply With Quote
Old 27th December 2007, 07:54 PM   #7
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Default Re: Hi !

Quote:
Originally posted by zeonrider
Mr.Nelson it is older than you !
No, it has transistors in it.
  Reply With Quote
Old 27th December 2007, 08:12 PM   #8
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
you don't ?
__________________
The buck stops Here
  Reply With Quote
Old 27th December 2007, 08:36 PM   #9
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default Re: Hi !

Quote:
Originally posted by zeonrider
It look like an old voltage regulator (line), from old Server-psu.

Good old gear!

I be able to see similar staf on the local scrapyard, very cheap about 10 Euro/14$

Fan is 120x120 (4,7244").

Mr.Nelson it is older than you !


Regards zeoN_Rider
do you mind buying few for me ?
__________________
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 27th December 2007, 08:50 PM   #10
diyAudio Member
 
zeonrider's Avatar
 
Join Date: Mar 2004
Location: Belgrade RS
Default Hi Zen Mod !

No, tomorow when I come back has gone,or sold.

But Bubanj Potok je keva. Pogladacu.I told you(by phone) half year ago that I, have many heatsinks.
Remamber Aleph PCBs by Kostas.

Regards zeoN_Rider
  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



New To Site? Need Help?

All times are GMT. The time now is 11:21 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