Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

AKSA Builders of market proven kits and modules at sound quality to rival the best in high end

Reply
 
Thread Tools Search this Thread
Old 29th July 2018, 08:39 PM   #1
mingdao is offline mingdao  Latvia
diyAudio Member
 
Join Date: Jul 2018
Default My Aksa (original) has given up

Hi all. Hi Hugh!

I used to lurk in these forums in late nineties. Then work and family took over. My original account is long lost, but some things remain from that age including couple of amps that I had built with my own hands.

One of them, which was built in 2001, if I recall correctly, is Aksa original amp.

One channel gave up and no longer works. I suspect blown transistor in the first stage, since it gets smoking hot (circled red in the pic). I've actually burned my fingers pretty bad.

Click the image to open in full size.

I do not have any plans for the thing, or a part list.
I am contemplating whether it is possible to revive it without a major effort.
Any ideas what may wrong and what is the part that I need.
Does it have to be matched pair (L/R)?
Many thanks.

Last edited by mingdao; 29th July 2018 at 08:56 PM. Reason: Misspelling
  Reply With Quote
Old 29th July 2018, 09:46 PM   #2
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
My Aksa (original) has given up
Is that even an original AKSA board or a DIY copy ? It looks like it's caked in dirt and dust and really should be cleaned up or it's just a bad photo.

Blown transistors usually don't run hot, either because they are open circuit (no current) or dead short (no voltage), the problem is possibly elsewhere. Are both fuses OK? Is there a voltage at the output ? Can you measure any of the operating points - voltages around the circuit.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

Last edited by Bigun; 29th July 2018 at 09:48 PM.
  Reply With Quote
Old 29th July 2018, 10:01 PM   #3
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
That's an original AKSA, Bigun! Thank you for your post.

Mingdao, if the voltage amp is running hot it likely means that the npn output device, C1302, is blown. Measure the voltage from the positive rail to the emitter on that transistor; if it is less than 1V, it's your man. Replace it and the amp will sing again!

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 2nd August 2018, 09:08 AM   #4
saf is offline saf  Portugal
diyAudio Member
 
Join Date: Sep 2009
Location: Porto
I have to say, without wanting to be offensive, that is probably the dirtiest ugliest looking AKSA i have ever seen.... Clean that up Dude !!!Please !
  Reply With Quote
Old 2nd August 2018, 09:22 AM   #5
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
The man speaks the truth....... naughty, naughty. Your amp looks like a porn star.......
Start with compressed air, then start with isopropanol, which does not leave a stain.

I would suggest you take it from the heatsink too to remove the dust around the output stage. I have a feeling the npn output device (2SC5200) is blown, so you might need to change it, or both in fact, the pnp as well. Can't hurt!

Cheers,

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 18th September 2018, 12:54 AM   #6
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
My Aksa (original) has given up
Quote:
Originally Posted by AKSA View Post
The man speaks the truth....... naughty, naughty. Your amp looks like a porn star.......
Start with compressed air, then start with isopropanol...
Thatís no way to treat an actress!
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 18th September 2018, 03:30 AM   #7
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
True enough...... but in that industry, Gareth, she might quite like it?

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote

Reply


My Aksa (original) has given upHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Set of Original manuals and some non-original whiteSE Swap Meet 0 7th June 2017 11:26 PM
AKSA 100 N+ djg440 AKSA 1 23rd November 2015 01:58 AM
how to backup original cd as the same sound quality as original cd ctrn Music 3 16th May 2006 04:21 PM
Fs Aksa 100 bacworth Swap Meet 4 5th December 2005 10:33 AM


New To Site? Need Help?

All times are GMT. The time now is 02:30 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki