here’s what I have settled on as being a comprehensive list of his stuff from back then:
GUITARS:
60’s Fender Jazzmaster w/ Tune-O-Matic style bridge
Gibson Les Paul Jr Double Cut (SG style) [on BUG]
EFFECTS:
Triangle or Ram’s Head Big Muff
Crybaby
Deluxe Big Muff (built in Soul Preacher Compressor)
Deluxe Electric Mistress
The Clone Theory
Stereo Memory Man
AMPS:
"For those of you with a technical bent, J. uses two fifty-watt Marshall heads going into a Marshall one hundred-watt head, which in turn goes into two 4Xl2 cabs." – 1987 SST press release