Amp repair Qs for late C4 Bose

Z-07 freak · 08-09-2007, 01:23 PM

Re: `91 coupe

One of the rear amps blew (sounded like a gunshot) a few months ago, and now one of the fronts is going out.

On the rear amp, I can clearly see where, I believe it's a transister, is scorched.
It's "Q1" on this sites diagram. http://www.zr1netregistry.com/Bose2.pdf
I was able to remove it, and I want to see if a replacement will fix it. However I'm having trouble finding the correct replacement transister.
I can't find a match on the original manufactures site. http://www.st.com/stonline/
I think I found a matching one on this site, http://www.digikey.com/
But I don't know if it's the 55v or 60 volt version.

As for the front one, since I can't see any damage, I'm thinking of putting it back in and letting it die completely to find out what part needs replacing.

Any help is appreciated.

-=Jeff=- · 08-09-2007, 03:53 PM

I have some at home.. I would need to check the #, I might even have the receipt from when i ordered them.. Not sure i will get a chance tonight but I don't think it should matter on the 55 or 60v part

Vis Croceus · 08-09-2007, 04:34 PM

Between the 55v and 60v parts just get the higher one.

Didn't look at the links so I'm not saying either one is actually correct...

Z-07 freak · 08-10-2007, 11:15 AM

I guess I'll try the 60v and see if it works.
http://www.digikey.com/scripts/DkSea...IRFIZ24EPBF-ND