MU-TRON 1173

Brand: Musitronics

MU-TRON 1173 DIGITAL DELAY by ARP Vintage Rack Effect Guitar/Synth/Studio/Pedal Musitronics...Read more

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The Mu-Tron 1173 - a very cool early digital rack delay unit made by Mu-tron (ARP) - the last of the Mu-tron line of effects.

It's in good condition, sounds great and has just been serviced and calibrated: the original mains transformer has windings for 240v, so it's been adjusted for UK/EU use without an external transformer.

Overall it's in very good condition, but it inevitably has a few bumps, dings and scratches; there's some oxidation here and there, and one of the delay time selector buttons is damaged, but still working fine (see detailed photos below).

These early delays are highly-regarding for their great sound and features: the freeze function is especially fun and inspiring to use, simply freezing and repeating whatever sounds playing at the time like a primitive sampler.

The five Delay Select buttons switch between delay times ranging from 2.5 to 160 m/sec and the Delay Variation knob allows more precise fine-tuning. In addition to straight delay, there's great thick doubling effects to be had; with modulation you can create crunchy flanging effects, and then head into sci-fi space funk territory by tweaking the Feedback, Modulation Frequency and Modulation Depth knobs for all manner of crazy sound design ideas. You can control modulation via CV input, and there's also balanced XLR input on offer.

Tax (VAT)

Some of our gear will have VAT at 20% added in the UK/EU, but a lot of it won't. This should hopefully clarify the situation but if you have any questions then please get in touch.


  • These items will have two prices visible: with and without the tax.
  • If you are buying in the UK/EU you will receive an invoice showing the tax component.
  • If you are buying these items outside the EU when you get to the check out and enter your shipping location you will be charged the ex-VAT price.
  • VAT-free sales are also possible to businesses within the EU with a valid VAT number. You will need to contact us in order to buy via this means.


    • Much of what we sell is classified as "Second Hand Goods" and so while we still pay some tax, there is no recoverable/deductible component for sales to any part of the world.
    • So, the price you see is the price you pay wherever you are.


    • Shipping charges are also subject to VAT at 20% within the UK/EU - this is included within the prices you see for shipping to those areas - it is not shown separately in the cart but will be shown on the VAT invoice you receive with your goods.

    We are very experienced at packing and shipping valuable and sensitive gear worldwide. Binson Echorecs, large valve amps, vintage synths, rare racks, and even a CS-80 or two - you name it, we've sent it and it has arrived in one piece and ready to play.


    We keep it simple: if you buy more than one item you only pay the shipping on the item that has the highest shipping cost. This is the same no matter how many items you buy together (so the more you buy together, the bigger your shipping discount). If you check all the items out all together this will be calculated automatically at checkout. However, if you make an order and then wish to add to it before it ships please get in touch and we will refund the shipping on the item(s) that are cheaper to ship.

    Note that this also allows you to purchase add on items such as transformers and other accessories, and also t-shirts and other merch, without paying any extra shipping on them.


    CAN I COLLECT MY GEAR (and save on shipping?)

    Yes! If you want to use this option either get in touch before you purchase, or contact us afterwards and we will just refund you the shipping. Note that collection is by appointment only and only during weekday office hours.



    The shipping prices for our gear vary considerably depending on the type of gear, value and destination. To see shipping costs put the item you are interested in the cart and then either use the shipping estimator or go into the check out process. Or just contact us and we'll tell you what you need to know.

    It is a fact that, with vintage items, there are going to be times when gear arrives in need of some adjustment or calibration, and some times a piece of gear that was working 100% just chooses the day after arriving for a new fault to develop. However, having been working with sensitive vintage gear for many years, we are very experienced at dealing with these occurrences and will always work with you and get the problem solved as quickly and painlessly as possible.

    Note that we have have not entered automatic shipping for every country. The countries we ship to most often will have shipping rates and we are in the process of adding more shipping fees to the check out process. But if you are looking at an item that doesn't have the fee information you need then please use the contact page or call on +44 1773 856475.

    Which carriers do we use?

    We usually use Royal Mail, UPS and DPD/Interlink - it depends on the item and destination as to which is the most economical. If you have a preference then we should be able to accommodate it (but we may need to pass on any additional costs) - just let us know what you need.

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