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The sunn Discussion Page > Sunn Musical Equipment > Q & A > Power transistor inside the Concert Lead (1976 version)
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Author Topic: Power transistor inside the Concert Lead (1976 version)  (Read 162 times)
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Athena Music Studio
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« on: February 07, 2010, 12:34:05 pm »
Hi !

I'm repairing my Concert Lead, and i have doubt about what the previous owner did with it. The schematics says it would be 2N3055 transistor for the power amp, but on my transistor i read "22-3155 7613" with the motorola logo. I think these are 2n3155 instead of 2n3055, but i'm not sure, i don't really know much in electronics yet.

If someone has more infos, i will appreciate Smiley

Thanks
Cédric
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george
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« Reply #1 on: February 08, 2010, 08:59:51 am »
The 2N3055 can be used in all locations of the power amplifier section. I believe Sunn used a selected part in one of the sockets but I have never had problems replacing it with a "standard" type numbered part.
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