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

Solid State Talk all about solid state amplification.

Audio Research amp rebuild
Audio Research amp rebuild
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
Thread Tools Search this Thread
Old 17th October 2009, 10:20 PM   #1
bacoburn is offline bacoburn  United States
diyAudio Member
Join Date: Jun 2009
Default Audio Research amp rebuild

Evenin' oh, wise ones...

I'm in the process of tracking down the 'issues' with an Audio Research D-52B. Have a driver transistor that is shorted across the Base and Emitter and will need replacing. Wondering if I should replace the lot of transistors while I have the beast apart. That de-soldering was a slice of heaven. Don't want to do that again if I can help it!

The output pairs are 2SB555 and 2SD425 and the drivers are apparently MJ15003/4 pairs (AR P/N 30002600/...2700). Would MJ21193/4 pairs be a better choice for both drivers and outputs? Better to stick with MJ15003/4 for the drivers and MJ21193/4 as replacements for the 2SB555/2SD425? Other good choices?

The D-52 and D-100 seem to differ only in numbers of transistors so a good replacement for the one would be good knowledge for the other.

Thanks guys!

  Reply With Quote
Old 3rd October 2015, 04:42 PM   #2
sb****33 is offline sb****33  France
diyAudio Member
Join Date: Jan 2009

I'm sorry but I can't help you with your troubles.

However, I'm trying to build a power supply like SP8B's.
I'm OK with the components except one : 30002600 (ARC).
Unfortunately/fortunately, your post is the only answer I found on the net.

Are you sure that the reference is MJ15003 (NPN) ?

Best regards.
  Reply With Quote
Old 3rd October 2015, 06:14 PM   #3
Nrik is offline Nrik  Denmark
diyAudio Member
Join Date: Feb 2005
Location: Copenhagen
Replacing non-faulty tranistors should not be necessary in my opinion - there are so many that it will be really expensive. And as you know: Don't fix it if it ain't broken.

If you bump into other problems you might be able to pick some cherries in this thread.

  Reply With Quote


Audio Research amp rebuildHide 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
Audio Research D-90 rudy129 Tubes / Valves 4 11th June 2010 01:19 PM
Audio Research St-70-c3 dcb50 Tubes / Valves 0 2nd October 2008 04:18 AM
Audio Research D 400 MK 1 Alex helge Solid State 1 21st May 2005 04:50 AM
Audio Research LS2 Lourens Tubes / Valves 2 4th April 2004 07:42 PM
Audio Research Ls 2 ben goh Tubes / Valves 5 14th June 2002 07:51 PM

New To Site? Need Help?

All times are GMT. The time now is 10:45 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio