The SLOW PHASE button also functions as the bypass switch. Interestingly, the three colorful plastic buttons were the same as those used on Lowery organs. CMI also owned Lowery at the time and suggested the use of the colorful Lowery buttons for speed selection. One unique and very cool aspect of the Maestro Phase Shifter is the fact that the phasing speed ramps up or down when changing from one speed to another, similar to a Leslie rotating speaker cabinet.This feature is not to be overlooked or underemphasized!!! The dynamic effect produced by the ramp-up/down feature sounds absolutely superb when used by an accomplished musician - no other phaser offers this feature and that alone makes the Maestro Phase Shifter worth the price of admission! The Maestro Phase Shifter is AC powered and uses a non-polarized AC cord. A switch on the top of the unit turns it on and off. A fuse is provided on the rear of the unit.
The classic Maestro emblem with its three colored "trumpets" is proudly displayed on the top of the unit. The PS-1 is a six-stage phase shifter. It utilizes Field Effect Transistors (FETs) as tuning elements for six cascaded all-pass filter networks with the input and output summed. An LFO modulates the FET control buss and includes a time constant so that when the LFO speed changes, it ramps up or down slowly, simulating the speed change of a Leslie speaker cabinet.Rare Original 70s Maestro PS-1A Phase Shifter Guitar Effect Pedal. General wear from vintage age. Thanks for looking and Good Luck! The item "Original Rare 70s Maestro PS-1A Phase Shifter Guitar Effect Pedal Bass Keyboard" is in sale since Monday, December 9, 2019. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Phasers & Shifters". The seller is "steviebgoode1" and is located in New Castle, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Barbados, Brunei darussalam, Bolivia, Egypt, Cambodia, Sri lanka, Martinique, Maldives, Uruguay.