can someone tell me of a place to start searching for a Nirvana type tone through my current rig? If so, here it is.

Washburn Def Leppard Sig (H/H) > Johnson DEQ-2 > Boss DS-1 > Realistic 10-band Equalizer > Fender Frontman 25R

Oh yes, and would this work with some 7M3 stuff as well?