MXR Digital Time Delay

The MXR Digital Time Delay (Model 175) is a vintage 1U rackmount effects unit released in the early 1980s (circa 1982–1983). It was manufactured by MXR Innovations Inc. in Rochester, New York, prior to the company’s acquisition by Jim Dunlop. At its release, the unit was considered a high-end digital processor, retailing for approximately $1,000 to $1,100 USD According to Google.

Click on the photos to see full front and back.

Features:

• Variable Delay Range: Provides selectable delay times via pushbuttons for Flanger (1.25–2.5ms), Chorus (5–20ms), Doubler (20–80ms), and Echo (80–320ms).
• Multiplier Control: A continuous rotary knob allows you to sweep the delay time from 0.25x to 1x the selected range.
• Onboard VCO: Includes dedicated Speed and Width controls for modulation, enabling pitch-shifting effects like lush chorus and deep flanging.
• Phase Inversion: Features an "Invert Delay" switch to flip the phase of the delayed signal, which is critical for creating specialized flange and phase-cancellation effects.
• Dual Outputs: Offers a pseudo-stereo output where one side is phase-inverted, creating a wider spatial field.
• Instrument/Line Switching: The back panel includes a level switch to accommodate both guitar-level signals and studio line-level gear. YouTube +7

Additional Benefits:

• "Analog" Digital Tone: Despite being digital, its early conversion technology and aggressive filtering result in a warm, rich sound often compared to analog bucket-brigade delays.
• Legendary Pedigree: Highly regarded for its creative potential, it has been used on iconic recordings like Heart’s "Barracuda" and is a staple on the pedalboards of tone purists like Eric Johnson.
• Ease of Use: Unlike modern processors with deep menus, its "one-knob-per-function" interface allows for intuitive, real-time sound manipulation.
• Rugged Construction: Built with a hardwired AC cord and no external "wall-wart" power supplies, reducing noise and increasing reliability for stage use.