peavey transistors

[dougal1111]

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]

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]

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]

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]

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.