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Old 30th August 2007, 12:40 AM   #1
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Default peavey transistors

i'm repairing an old peavey amp which has blown the pnp driver/output stage, the the four output transistors, mj15025 are easily obtainable, but the driver MJ15021 (70471180 1 amp.180 volt. PNP. TO3) seems to be obsolete,
at least in the uk.
can someone please suggest an equivilent

many thanks
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Old 30th August 2007, 04:23 AM   #2
jaycee is offline jaycee  United Kingdom
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Seems odd that they used a TO-3 cased device here! The MJ15020/1 are marked obsolete by OnSemi.

I'd be inclined to try replacing the driver transistors with MJE15034/5 instead. These are TO-220 devices but their spec closely matches the old MJE15020/1 pairs.
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Old 30th August 2007, 04:55 AM   #3
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Call or email Peavey service. It's really excellent and there is a wealth of actual knowledge from the people there. They may well have spares, it wouldn't surprise me. They don't gouge you on price either.
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Old 30th August 2007, 08:36 AM   #4
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many thanks for your pRompt response,1 amp in a TO 3 does seem a bit of an overkill,

ps found mcgregor people very helpful too.

thanks again
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Old 30th August 2007, 08:56 AM   #5
djk is offline djk
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ON Semiconductor suggests the MJ15025 to replace the MJ15021.

The MJ15021 looks like it was the die from a MJE15032/33 mounted in the TO-3 package.

If after checking with Peavey and I found I still needed a part, I would look at the MJW1302, the lead spacing is correct too.
Candidates for the Darwin Award should not read this author.
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