This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included). The Phase 90 was the first pedal sold by MXR and helped launch the company in 1974. Since my guitars are all active with low impedance outputs, (50 ohms), I didn't need the high input impedance stage. MXR’s contribution to phase-shift effects was the high-quality, small size and reliability of the stompbox, in contrast with previous models that tended to be dodgy, bulky and noisy. In 1977 MXR changed its logo to a block style. There was a transitional period in which some Phase 90s with script logos had box logo circuits, and vice versa. MXR Phase 90 Analysis. The Phase 90 takes you from subtle, spatial shimmer to all-out high velocity swooshing with the twist of a knob. The Phase 90 is a phaser guitar pedal designed by Keith Barr in 1974.It was the first product sold by MXR with great success. Re: phase 90 trimpot « Reply #8 on: December 23, 2010, 04:46:45 AM » This is kind of a crude way of doing it,but..put on Van Halen 1,and fast forward to the end of "Eruption".Set the speed knob to 9 O' Clock,and turn the trimpot until it matches the speed of the recording.Just a thought :icon_smile:I've actually done it myself,and it actually worked! The original model had a simple orange enclosure with a script style MXR logo. I do have a 1974 phase 90 but I removed the input fet and high input impedance and wired the input to the first opamp stage, all LT1351's. Honoring Van Halen’s history with the Phase 90, MXR gave Eddie a signature version of the effect.

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