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Old 17th October 2009, 10:20 PM   #1
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!

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Old 3rd October 2015, 04:42 PM   #2
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.
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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.

STOP - Hammertime!
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