Audio Research amp rebuild

bacoburn · 17th October 2009, 10:20 PM

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!

Brooks

17th October 2009, 10:20 PM	#1
bacoburn diyAudio Member Join Date: Jun 2009	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! Brooks

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)