Radio amp
 

I posted on here a while back regarding poor radio sound (bery tinny) in my saab 93 52 plate.
After lots of investigation by a car radio specalisthe thinks, but not 100% sure the amp under passenger seat is the problem, and the speakers in front doors are not working proper (just slight hiss), he thinks cos of the amp...
Anyoneany ideashow much to relace the amp, and where do you get them from apart from saab.