I discovered Robin Trower a few years ago from a book of guitar licks. Bridge of Sighs is an awesome album and the title song is awesome. His later stuff from the 80's onward didn't really do it for me.
As far as his sound goes, I recall finding a youtube video where he discusses his rig. Getting his sound (equipment-wise) should be relatively easy since he doesn't change it up much, if at all. From the way he talked, he wasn't much of a gearhead. He came about a sound that he liked and stuck with it.