peavey transistors

dougal1111 · 30th August 2007, 12:40 AM

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
doug

jaycee · 30th August 2007, 04:23 AM

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.

Brett · 30th August 2007, 04:55 AM

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.

dougal1111 · 30th August 2007, 08:36 AM

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

djk · 30th August 2007, 08:56 AM

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.

30th August 2007, 12:40 AM	#1
dougal1111 diyAudio Member Join Date: Aug 2007	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 doug

30th August 2007, 08:56 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	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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30th August 2007, 04:23 AM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

30th August 2007, 04:55 AM	#3
Brett diyAudio Member Join Date: Jan 2002	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.

30th August 2007, 08:36 AM	#4
dougal1111 diyAudio Member Join Date: Aug 2007	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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