MXR M-175 Digital Time Delay 320mS Chorus / Flanger / Phaser #2 (serviced & power supply recapped)


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The power supply of this Digital Time Delay has been recapped, and the pots & switches cleaned & lubricated

These MXR Digital Time Delays are quirky devices with all the charm – and unpredictability – of vintage digital gear. This is a 110 Volt example in tidy vintage condition. It has all the original knobs & switches plus a few case scratches & rack rash from 35 years in a studio rack. Photos show a Digital Time Delay sold previously and wil be replaced with photos of the unit fopr sale

As well as stomp boxes, MXR once made a range of rackmount gear. From the late 70s through the 80s, MXR effects graced the outboard racks of major studios & touring racks of artists including Jaco Pastorius, Queen, Frank Zappa and Dimebag Darrell

Jim Dunlop restarted production of MXR stomp boxes but the rack gear is only available in vintage form. The range of rack equipment included equalisers, delay lines, pitch shifters and chorus units – all rare but now acquiring deserved vintage status

The Digital Time Delay was a 1U rackmount delay line built in a number of versions. This model has 320 mS (1/3rd second) of delay. With built-in modulation it can create chorus, flanging & phasing effects as well as straight delays

The Digital Time Delay has definite “early digital delay” vibe like an early Lexicon and, as with the PrimeTime, delay time can be varied via a multiplier control. In the MXR, delay is continuously variable from 1 x to 0.25 x. Delay time is modulated by the oscillator giving the up & down pitch shifting typical of early delays. Variable feedback and phase invert mean you can create killer chorus & flange effects

Delay times are settable using pushbutton switches and can be varied using the delay time control

• Flange: 1.25 0r 2.5 mS
• Chorus: 5 or 20 mS
• Double: 63 or 250 mS
• Delay: 80 or 320 mS

“Delay, modulation type flange, phase rotation… Rotary change the values of delay hyper intuitive! “

“A marvel of creativity!”

“MXR also released single-space processors, including the Digital Time Delay. The only thing that tone freaks need to know about this unit is that Eric Johnson, arguably the biggest tone chaser of all time, keeps one on his pedalboard (yes, his pedalboard) to this day.”

It’s easy to lose a couple of hours experimenting with a Digital Time Delay. It challenges you to time your inputs, to maintain a rhythm and create even weirder effects. These early devices are more tangible than later digital fx and are far more creative. They’re huge fun to work with

Digital delay line with set delays of 1.25, 2.5, 5, 20, 80 & 320 mS. Delay times are variable from 0.25 to 1 x the pushbutton setting. VCO with adjustable speed & width to produce modulation effects, delay inversion switch, feedback control and an effect / dry mix control. Inputs & outputs are via jack sockets. Two outputs are provided to produce a "stereo" output where one output is phase inverted with respect to the other. 220 Volt AC with a fixed power cable and standard UK power plug

1U device suitable for mounting in a standard 19" rack. 220 Volt AC with a fixed power cable and standard UK power plug

MXR Blog - The Rackmount Era

YouTube Review


Tested. Passes signal OK but there is no delay signal at the output. Otherwise tested & working well. In excellent cosmetic condition with all original knobs & buttons

Photos are of a Digital Time Delay sold previously

Serial 75-000103

B Stock items are sold as-seen with no returns. They have been tested, and a brief description of the faults or damage is given, but they may have other faults and may not test the same in future