The MXR Phase 90 is one of the most famous phase shifters ever created and found its way into the rigs of countless guitar legends over the last four decades. Aside from its classic orange casing, the Phase 90 is instantly recognizable thanks to the unmistakable script logo. The '74 Vintage Phase 90 is a re-creation of a Phase 90 purchased in 1974 by Dunlop Senior Engineer Bob Cedro and constructed from a hand-wired board and hand-matched FETs to match the tone of the original. Get classic tone from the '74 Vintage Phase 90. Note: 9V battery operation only. No input for external power supply.