EMT 444 Time Delay Unit

Serious chunk of early digital technology - 12 bit delay. One of the great (literally) digital delays. Serviced by a tech experienced with EMT gear. Supplied with our warranty.

Select Currency

You missed it!


It’s big. Really big.

One of the greatest analogue delays ever made. Serviced by a tech experienced with EMT gear. Supplied with our standard warranty.


Astonishing early 80s German technology and build quality. This thing is a monster with 6 outputs and a total of 7 transformers inside.

Note that we need to complete final testing on this unit and it will ship within 10 working days of purchase.

There is speculation that one of these was employed by Bowie/Visconti during the recording of Heroes at Hansa: we’d welcome confirmation or otherwise of this mystery online ‘fact’.

Here’s some info from the manual:

EMT 444 Electronic Time Delay Unit provides delay of audio signals and enables additional effects to be generated.

DELAY PROGRAM: The processed audio signal is available at 2,4 or 6 outputs, each selectable for any delay time between 0 and 255 ms in steps of 1 ms.

SPECIAL EFFECTS: Are possible, for instance:

  • TIME DIVISION: The selected delay times can be multiplied by 0,5 / 0,25 or 0,125 , this allowing incrementing down to 125 µs.
  • CLOCK VARIATION: Continuously variable delay time, manual or voltage control, for fine adjustment of the delay time or for generating frequency or phase modulation. Useful for vibrato, chorus, and phasing effects. TIME DIVISION can be additionally employed.
  • ECHO FEEDBACK: Enables echo effects to be generated with repetition times between 0 and 255 ms, selectable in steps of 1 ms, and decay rates between 0,5 and 60 dB per repetition. TIME DIVISION and CLOCK VARIATION can be employed as well.
  • LOOP: Permanent repetition of an initially introduced audio signal with a cycle time of 255 ms. Useful for scientific analyses, e.g. of spectra or of initial transients, as well as for special effects. TIME DIVISION and CLOCK VARIATION can also be employed.

COUPLING OF TWO UNITS: Two EMT 444 units can be cascaded for longer delay times or coupled in parallel to increase the number of inputs and/or outputs.


* Delay time: 1 to 255 ms, selectable for each output separately in 1 ms increments; switchable factors of 0,5 / 0,25 and 0,125 for fractional incrementing.

* Digital coding:

– internal: 14 bits
– A/D converter: 12 bits
– resolution: quasi-15 bit through threefold switching of the quantizing range

* Sampling frequency: 32 kHz
* Storage capacity: 112 kbits
* Input: balanced and floating
* Input impedance: more than 10 kOhms
* Input level: +6 dB / 1,55 V nominal level, adjustable between -10 to 15 dB

* Outputs: 2,4 or 6; balanced and floating (1,2 or 3 OUTPUT plug-in units)
* Output impedance: less than 40 ohms
* Output level: +6 dB / 1,55 V nominal level, adjustable between -10 to 15 dB
* Clipping level: 6 dB above nominal level

* Signal-to-noise ratio:

– RMS, unweighted – more than 78 dB
– Peak weighted – more than 72 dB

* Frequency response: 20 Hz to 15 kHz (+1/-3 dB)
* Harmonic distortion: less than 0,3% at nominal level and 1 kHz

* Coupling:

– Digital loop operation (1 unit)
– Analog feedback (ECHO, 1 unit)
– Digital cascade coupling (2 units)
– Digital parallel coupling (2 or more units)

* Power connection:

– 100 to 120 V
– 220 to 240 V
– 50 to 60 Hz

* Power consumption: approx. 70 VA
* Dimensions for rack mounting: 483 x 221 x 456 mm (W x H x D)
* Dimensions in tabletop cabinet: 505 x 255 x 525 mm (W x H x D)
* Weight: approx. 29 kg or 64 lbs


Recently serviced by an EMT specialist. In excellent condition, the face is superb with only a couple of minor dings or signs of wear. The case is very clean with minimal signs of age or rack rash. See photos for more information on cosmetic condition.

Voltage Information

Switchable voltage for use anywhere in the world - it will be set up ready for you to use before we ship.


For sales in UK/EU, this item is on the margin scheme for second hand goods. VAT-free sales are not possible for this item.


"The packing job to get it over to the US was superb, and the sound and performance of my Space Echo exceeds all of my expectations. I hope to do business with Soundgas again in the future. Many thanks!”

Rhett Daily

“If not a new language, then at least a very challenging, old dialect that will take me some time to assimilate. I’ve been waiting a long time for the challenge. Thank you @soundgasltd, she’s a beaut...and nobody prepares and packs like you fine folks.”

Justin Meldal-Johnsen

"Still in shock! Can not believe how good the seller is. This product was inspected, and shipped from the UK to the USA quicker than orders from my home state. Highly recommend these guys."

Thomas Tedesco

"808 is up and running. It’s hard to stop playing it. Like even to eat. Extending testing is quality control and the quality of your stuff combined with customer service is one of the reasons Soundgas is so successful in my opinion."

Brett R

"Soundgas provided the absolutely top service in terms of item quality as well as service and communication. Shipping was fast, packing was top notch. These people deserve the best reputation they already have. Many many thanks, guys."

Dupille Luc

"DREAM. COME. TRUE. My music has taken me around the world a few times...and if you are like me and absolutely adore vintage gear...Soundgas is the stuff of LEGENDS. It's the shop that people like us search for our whole lives- fantastic and rare selections, and the technical know-how to repair and or mod these vintage items to get them into shape to flow with your modern setup."

Tom Gossin

As good as it gets. Tony, Dec and team have been incredible, prompt communication, great advice and outstanding service. It really felt like my Polysix came from a loving home.

Ben Parm

“The Space Echo made its way to me - it looks and sounds beyond dreams, thanks guys for your great service and communication.”

Julius Bonson

I have been buying vintage stuff for a long time from resellers/stores/techs. I've never been so surprised and pleased after opening! Just received a Roland RE-201 and VX55 mixer, they look and sound amazing! Thanks to Tony/Declan for the service and the Soundgas team will be back!

Dong Yun Seok

Purchased a Juno-60 and it works beautifully. Having gotten one teched before, I knew it was worth paying a premium to get it future proofed and Soundgas does just that. Shipped professionally from the UK to USA. Appreciate their expertise and professional demeanor!

Eric Cullen

"Soundgas offer a great service, sourcing esoteric gear that works great."

Tom Rowlands - Chemical Brothers

"When you are spending big money of vintage gear it's nice to have the confidence of impeccable service, sales and support... some of the best in the industry! Impeccable people, incredible equipment… my poor poor fiancé"

James DLR - Sofa Sound/Metalheadz

“If you are a vintage audio gear head then this is the place you have been looking for all your life. Pretty much any piece of classic or obscure kit that you are after is available here... But the clincher for me is that the gear they sell has been restored by their top techs (unless otherwise noted) which is really very important when dealing with, for example, synths from 30 years ago.”

Lincoln Barrett / High Contrast

“The perfect place to hear, learn about and then buy your most wanted piece of vintage music gear! I've not only managed to buy a rare piece of equipment I really wanted, but I have the guarantee it's been serviced, and I got it from people who are clearly passionate and knowledgeable about what they do, as well as super friendly and responsive by email. Thoroughly recommended!”

Colleen / Cécile Schott

"Yes, sure, you can find a Space Echo on eBay, but you won’t find one like this — that’s certain. I am so pleased with my decision to buy from Soundgas, and suggest you stop your search now and just send them a message. You will undoubtedly find yourself writing an ecstatic review about yours in short time."

Ben Evolo

“I’ve bought a number of items from Soundgas recently, and have been really impressed with their service. It takes the stress out of buying vintage gear to know it’s been properly (and faithfully) serviced or restored. Their after-sales service has also been exemplary. Highly recommended.”

David Wrench

Grabbed a Roland RE-201 (early edition killer pre-amp) and Roland DC-50. Absolutely STUNNING. These guys truly live up to the hype. They are meticulous in caring for the gear. Also, I have a few guitar pedal and plug-in emulations of tape-echo sounds and after plugging in the real unit I can't tell you how insane the difference is. It is incredible. Especially that tone from the early pre-amp! I am totally amazed. I am in heaven :) They made it safely to Nashville from the UK and were packed really really well! Thank you so much!! Worth every penny.

Chance Allen

"Soundgas has an unbelievable selection of the cool, old stuff that’s hard to find. Tony knows his stuff and goes out of his way to make sure the transaction is a smooth one. Thanks guys!"

Tucker Martine - Flora Recording

"Engaging with old gear can sometimes be filled with a lot of uncertainty, and I can't imagine what more could be done to reduce this aspect of it on top of the service you provide. Really phenomenal and I couldn't be happier."

Stephen Voinea

Just wanted to say thank you so much for your pinch roller and echo tape. I've had a space echo for years, been sent to a shop in NYC and it never worked quite right. After installing the roller and tape, my echo works like a dream. Really incredible expertise you all have! Thank you.

Andrew Potter

“I have bought two Moog synths from Soundgas over the past year, and I cannot say enough wonderful things about their selection of vintage products, the level of service, diligent responses to email, and expedient shipping with copious protective packaging. Soundgas is an impressive operation. My synths also sound amazing! These folks have made my vintage keyboard dreams come true in short order!”

J Yates

"Finally, a company that tracks down all those brilliant curiosities that bring so much character and personality to a studio."

Matthew Herbert

“Imagine the perfect eBay.... with everything you never knew you wanted… and you can rest assured that your vintage and rare wobbly sound device will turn up on time and in one piece and possibly in even better condition that when it left the workshop. Soundgas - literally amazing."

Josh Lloyd-Watson & Tom McFarland - Jungle

"Packed with love and care. A stampede couldn't have crushed this thing. Works great and sounds like a dream. I love you Soundgas."

Ben Van Vlissingen

"Just received my Roland RS 505 Paraphonic! Thanks so much - arrived very promptly, well packaged, in great condition and sounds amazing! Best seller."

Koko Hiras

"Excellent equipment, wonderful service. I fully recommend Soundgas to anyone in the vintage gear market and I will definitely be a return customer. The gear itself was exactly as advertised and in great condition."

Hallam Kite

Fantastic. From initial contact to the product landing at my door the service provided was outstanding. Safe and secure shipping, quality serviced product.

Tom Johnston

“I purchased a completely overhauled vintage valve Binson Echorec 2 T7E modified with varispeed, wet-only output, and a new paint job from Soundgas in early 2018. Tony and his team did an amazing job during every step of the purchase”

Matt Morton


The Weird and the Wonderful – An Auction Update

The Weird and the Wonderful – An Auction Update

We can't stop here, this is bat country! Our next auction (November 22nd) features some head-turning, show-stopping synths, however we also wanted to put the spotlight...

PUBLISHED: 21st Nov 2023

Teaching Machines Wellspring Reverb Review

Teaching Machines Wellspring Reverb Review

Tony takes a dive into the new Welsh-made Wellspring Stereo Reverb and comes up with a very big smile on his face.

PUBLISHED: 17th Oct 2023



We stand behind our gear with a guarantee of your satisfaction - see the FAQ section above for full details and buy with complete confidence.


When buying more than one item you only pay the shipping on the item with the highest shipping cost. Calculated automatically at checkout.


Get in touch via the contact page. We know & love our gear and we want to ensure you get something that matches your needs (that, and we just like talking gear).

Select your currency