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Old 28th December 2006, 01:15 AM   #1
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Default help br6521 and br6522 datasheet

hi,
i google it but cant find any datasheet, someone have it. i have a bunch of them and no info
motorola br6521
and
motorola br6522
tsnks in advance
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Old 28th December 2006, 01:22 AM   #2
anatech is offline anatech  Canada
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Hi Moshirio,
Those are Bryston transistors in a TO-220 case used in the 3B and 4B series. The legs are longer than normal.

You could use MJE15030 and MJE15031 to replace them, but if you are repairing a Bryston you will need to extend the legs.

-Chris
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Old 31st December 2006, 04:57 PM   #3
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well, i allready have found that they are used in briston amps, but the br6521 and br6522 i have (+/- 20 each in stock) are TO3 case.
so if the charecteristics are similar with MJE... i can assume that:

br6521
NPN 150V 8A 50W

br6522
PNP 150V 8A 50W
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Old 31st December 2006, 07:18 PM   #4
anatech is offline anatech  Canada
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Hi Moshirio,
Sorry, I should have consulted a schematic. I was assuming you were asking because the TO-3's are easy to sub. The TO-220 drivers normally stump most guys.

So, they are a special number for Bryston that does not relate to any similar number. Looking at older databooks of that era may give a few clues. They may be 2N3773 and 2N6609, or if they were feeling particularly cheap, MJ15015 and MJ15016. The last numbers will have an hFE on the NPNs averaging around 50 or so, the PNP will run around 180 at low testing currents. The better parts will have closer averages between those numbers. 2N5631 and 2N6031 are a good pair. I doubt strongly they would have used the really nice ones like MJ15022/23 or MJ15024/25. I used those to repair dead Brystons.

The best thing you can do to identify (unless someone at Bryston confirms what model transistor they really were) is measure the hFE's and also look to compare the case styles of the normal production of that time. Note that MJ15015 and MJ15016 are classed as "economy" transistors by Motorola. I was never impressed by the tolerance in transistor matching used in the early models either.

-Chris
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Old 1st April 2009, 07:37 PM   #5
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Hi Moshiro

Do you still have these transistors in your possession?

I blew away a channel of my Bryston 3B amp and I could use some.

Could you please contact me?

Cheers,

Rob
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Old 1st April 2009, 08:31 PM   #6
anatech is offline anatech  Canada
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Hi Rob,
You can simply buy the current On-Semi parts. They will be more reliable for one. For the TO-220 parts, just extend the leads on the new ones.

I wouldn't depend on the older parts from old Bryston amplifiers. Certainly I would not hang my reputation on a repair like that. Using the new ones, I don't have any problem standing behind the repaired amplifier.

While you are in there, match the input transistors. That will reduce distortion. Those electrolytic capacitors are bad by now. Everyone I have tested these days has at least a couple really bad.

-Chris
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Old 14th March 2011, 06:15 PM   #7
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Hello Chris and Diyaudio members. I am new to this forum and glad to find so much expertise in one place.
I have a 21 year old Bryston 470. This is a 4B Pro monoblock with the addition of a 70v output. (4) of the BR6521/22 are shorted, (2) are open, (2) maybe OK. If I understand correctly the recommended replacements are MJ21193/94 which are available at onsemi. I found the link here to Bryston pdf drawings and 3 drawings look to match my amp. Strangely the center leg on all the (4) SJE1490/91 is cutoff as if done by Bryston. But this is not marked on the drawings. I would like to replace and update any parts that should be replaced after 21 years. Chris you mentioned input transistors to reduce distortion. Would they be the (4) SJE1490/91 or the input transistors on the balanced input module. What would be a suitable equivalent? Also could you recommend a source for 10,000 uF capacitors. Is it beneficial to go with larger? Chris you mentioned about a way to 'warmup' faster with a modification.
I have other 470's that I am currently using in my home theater and plan to clean them up also as they have a small crackling/popping noise five minutes after the music stops.

-Harald
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