The MK IIc+ was his main tone,then he would double
with the Marshall,and the ADA preamp,and let's not
forget the triaxis preamps,I think they were nodded
by boogie.I really think his tone came from his fingers
though.His style of down picking seems odd,with his
thumb and index finger,like he's holding his hand away
from the strings.
He's still my favorite though.