MPSU95 sub?

[Gtr_tech]

I need to track down a replacement for the MPSU95...which is apparently rare as frog hairs. MCM lists it but I *will not* pay 35$ for it. Its out of the EQ section of a Messy Booger Mark II....a leg broke off it right at the pkg. Takers?

[Enzo]

AH geez.

That is the only PNP darlington in that case 152 package, from Moto anyway.

Look up D40K4. That is a TO202, sort of a big brother to the 152. Same pinout I think.2

At small currents - which I believe the boogie circuit to be - it has a gain of 10,000, which is remotely in the ballpark. I think the MPSU95 is about twice that.

And you might be the only guy here to get this - I THINK the D40K was the transistor on the little board on the side of the Deltronics ticket dispenser. Got any of those?

And the pinout is wrong, but a TO220 TIP105/106/107 might even work. They have gain as high as 20,000.

[Gtr_tech]

I get it I know them well. Don't have any or access to them anymore. I was thinking the WG color X-Y monitor deflection boards might have them but it was in appearance only. OK then.....off to search the parts boards.......

[tim]

Did you try Mesa and ask what they use? Best thing to do is ask for the tech that works on those amps. They are very friendly people there and I have found them to extremely helpful...in fact there's a guy named George there that will literally talk your ear off for hours if you let him. Fortunately he's also a fountain of knowledge when it comes to MB products.

Don't try and call on a Friday though. I think they still work a 4 day work week.

BTW This place has them for $20

http://store.americanmicrosemiconductor.com/mpsu95.html

[gbono]

Try Central Semiconductor - http://www.centralsemi.com/. They make many obsolete solidstate devices and their catalog has a PNP darlington part # CEN-U95. I can not find a PIN out but you could call them and get a few samples.

[lowell]

I'm working on a Mark IIC. It has no output. I've narrowed it down to the EQ section. It is in fact the MPS U95 - has a broken lead. Mesa says to replace these with MPSA63.

[J M Fahey]

Or you could kludge a Darlington out of 2 regular 10 cent transistors.

[jrfrond]

American Semi has been very good for obsolete and oddball stuff. So have Futurlec and B & D Enterprises.

$20 bucks might seem like a heavy hit for a single transistor and some people might rig it. I have a penchant for being as close to original as possible in special cases like these. But hey, if the more common MPSA63 is is the suggested replacement (albeit in a TO-92 case), then go for it.