Yes, the Phase 90 is a phase shifter. It's the one in the orange metal case that has been produced since the 70's, I believe. There are three orange models and an Eddie Van Halen model in a differently painted case . The basic one is about $70.00. Then there's the $100.00 retro one I got and a $120.00 hand wired retro model.
Fun Stuff!
R.