Help with obsolete transistor replacement

texaslonghorn · 19th September 2009, 04:38 PM

I have a Bryston 3B that is out of warranty and I have blown some of the power transistors - old MOT SJ6521A. I can't find any info/datasheets on these so I can't find replacement data. Any ideas? I found some postings in various forums that seem to indicate that MJ15024/5 may be the current replacements, but I am not certain. If possible, I would like to avoid paying the "Bryston price" for replacements, but if I have to, I guess I will. Thanks.

jackinnj · 19th September 2009, 08:38 PM

The output transistors appear to be MJL21193/4 You can upload the schematic here:
http://www.schematics.ca/modules/PDd...ton_3b_sst.pdf

texaslonghorn · 19th September 2009, 09:24 PM

Hi. Thanks much - but how much does it matter that my amp is not an SST or NRB, but just a plain ol 3B?

19th September 2009, 04:38 PM	#1
texaslonghorn diyAudio Member Join Date: Sep 2009	Help with obsolete transistor replacement I have a Bryston 3B that is out of warranty and I have blown some of the power transistors - old MOT SJ6521A. I can't find any info/datasheets on these so I can't find replacement data. Any ideas? I found some postings in various forums that seem to indicate that MJ15024/5 may be the current replacements, but I am not certain. If possible, I would like to avoid paying the "Bryston price" for replacements, but if I have to, I guess I will. Thanks.

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19th September 2009, 08:38 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	The output transistors appear to be MJL21193/4 You can upload the schematic here: http://www.schematics.ca/modules/PDd...ton_3b_sst.pdf

19th September 2009, 09:24 PM	#3
texaslonghorn diyAudio Member Join Date: Sep 2009	Hi. Thanks much - but how much does it matter that my amp is not an SST or NRB, but just a plain ol 3B?

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