Instant Phaser


Main Details
Maker Eventide Company
Additional Model ID PS-101
  • 1 × Channel (Main input)
  • 1 × Channel (Main output)
  • 1 × Channel (Aux output)
Form Factor 19" Rackmount
Signal Path Analog Hardware
Made In USA
Date Produced 1971
Dimensions 480 x 89 x 260 mm (W x H x D) + 20 mm knobs
Weight 10 lb
Power Source USA 115 V AC / Europe 220 V AC, 50-60 Hz, 20 W, captive mains lead
Frequency Response 20 Hz to 15 kHz, +1 dB, -0 dB (phasing out)
Notes Input & output signals are unbalanced to ground unless option O4 (transformer) is installed.

One can use either an Envelope Follower, an Oscillator, or Remote control to vary the phasing effect, or set a fixed Manual level.

Pseudo-stereo (Main+Aux) output, with phasing still present even when mixed to mono. Main output uses four Fixed Phase Shift sections, Aux output uses two.

Units used by Isao Tomita, Yes, The Grateful Dead, Chicago, Led Zeppelin, Todd Rungren, Hot Tuna, The Edgar Winter Group, and over 100 major Studios, including CBS, EMI, Media Sound, The Record Plant, and Electric Lady.

The beautiful old lamps on this unit are larger than LEDs and a joy to behold!
Additional Specifications
Frequency Response (Max Depth) 50 Hz to 20 kHz (+1/2 dB)
Frequency Response (Min Depth) (-20 to +6 dB, depending on input frequency and phasing control setting)
Distortion <1% (at +4 or +8 dBm)
Signal to noise ratio >64 dB
Phase shift >1200 degrees (at 1 kHz)
Envelope Follower Threshold -6 dB peaks required for full phasing with threshold control fully clockwise
Remote control input 0 to +10 V for full control range. Internally strappable for 0 to +5 V Voltage available at front panel connector for driving remote control potentiometer.
Bypass Green lamp In/Out
Remote Green lamp On/Off
Oscillator, Internal Yellow lamp On/Off
Phase shift Red lamp Pulses on/off indicating phasing speed
Manual Red lamp On/Off
Envelope Follower Cyan lamp On/Off
Power White lamp On/Off
Remote (front panel) 1/4" Phone Jack (6.35mm)
Remote Terminal Block 3 Way
Input Terminal Block 3 Way
Aux output Terminal Block 3 Way
Main output Terminal Block 3 Way
Parameter: Bypass
Control Type: Toggle Switch
Range: In/Out
Parameter: Depth
Control Type: Rotary Pot
Parameter: Oscillator speed
Control Type: Rotary Pot
Range: 0.1 to 10 Hz
Parameter: Manual phase shift
Control Type: Rotary Pot
Parameter: Envelope Follower Threshold
Control Type: Rotary Pot
Parameter: Envelope Follower Release Time
Control Type: Rotary Pot
Range: 0.1 to 5 seconds
Parameter: Control mode
Control Type: Rotary Switch
Range: Manual / Oscillator / Envelope / Remote
Parameter: Power switch
Control Type: Toggle Switch
Range: On/Off


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