Bryston output and driver trannies, what are they? - diyAudio
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Old 9th February 2004, 07:46 AM   #1
tubenut is offline tubenut  South Africa
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Default Bryston output and driver trannies, what are they?

A friend is looking at a 4B ST amplifier, one channel has gone down. This is his first Bryston, done plenty Krell and Cello and a whole load of European amplifiers.
Anyone know what SJ6521A, SJ6522A, SJE1490C and SJE1491C are when not labelled by Bryston?
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Old 9th February 2004, 01:18 PM   #2
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Sorry this is not the answer your looking for, but why wouldn't your friend just send the amp back to Bryston? They absolutely stand behind their 20 year, fully transferable warranty, and if I'm mistaken, the ST modelscame out in the 90's. That should give him 10 years or more left on his warranty.
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Old 9th February 2004, 03:06 PM   #3
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Have you looked at this thread??
Building Bryston amps from the service manuals
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Old 10th February 2004, 05:04 AM   #4
tubenut is offline tubenut  South Africa
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Default I and my friend are in SA.

My friend and I stay far from the US, he is an independant technician. He does repairs for several distributors and dealers down here.
Exactly why the Bryston has come to him we are not sure of but he is not likely to turn away his daily bread.......


Rgds
G
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Old 10th February 2004, 06:15 AM   #5
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As I understand it, your fiend is doing this for money - Right???

If his costumer of some reason don't want to return his Bryston amp back to the factory for repair, your friend could ask him if he may use other parts for the repair.....

It should be easy to find substitute transistors just by looking at the voltage operation area and the Bryston frequency range.
If he's afraid of mismatch sound between the channels, he can change both channels.
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Old 10th February 2004, 07:46 AM   #6
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Default Yip...

That may well be what ends up happening I guess. The real thing would have just been nice for consistency.

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Old 10th February 2004, 08:06 AM   #7
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As you can see, others have found substitutes from Motorola etc.
It's quite normal to use substitutes when components are either impossible to get or obsolete
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Old 10th February 2004, 09:21 AM   #8
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Default MJ15024/25 and MJE15030/31

My friend went through the substitute process and knowing that they are made by Motorola arrived at the above types. I also got a reply on audio asylum confirming that these are the business.
Krell also uses the same output trannies btw.

Thanks all

Will post just to let you all know when the amp is up and running.
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Old 11th February 2004, 09:42 AM   #9
tubenut is offline tubenut  South Africa
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Default fixed, soaked for 20 hrs now. Thanks all

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Old 11th February 2004, 10:19 AM   #10
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Glad to help
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