http://www.slashparadise.com/equipment/live-gear-slash-solo-tour.php
This is the rig he used for his solo albums. In this intro he used the MXR M101 Phase 90 into the MXR M159 Stereo Tremolo (in mono) into the amp. The phaser has to go in front the M159, otherwise you will have anoying phaser artifacts that are not on the record.