The World’s FIRST Digital Reverb: EMT 250 Part 1 Demo with a Sequential Circuits Prophet-5

video upload by foleytronics fx repair

"This is a 1976 EMT 250 digital reverb, one of not very many ever made. It came to the shop screaming white noise in my ear as soon as you turn it on, which ended up being a RAM issue. 12 bit (quasi 15 bit according to the manual as it converts the signal to floating point while it processes the signal, though I think they meant 16 bit as the RAM array is 8k x 16), 24 khz sample rate, probably around a 10 kHz roll off.

Part I discusses how to use it and you can hear some sound demos, part II will explore the circuitry of the unit a little more.

Shot and edited by Michael Shular"

EMT 251 Digital Reverberation System

Note: Auction links are affiliate links for which the site may be compensated.

This one was spotted and sent my way via Soviet Space Child.

Not a synth, but it should be. Look at it! Someone needs to make a synth with massive levers.

via this auction

"EMT 251 Digital Reverberation System from Sunset Sound Studios.

SPECS:

serial #: 45477
16-bit
"REV" = main reverb
"NON LIN" = non-linear
"250 REV" = reverb sounds like the 250 unit (Some 251 units have this as "SPC REV" = space verb.)
"DEL" = delay
"CHOR" = chorus
"ECHO" = echo
"D REV" = doppler reverb"

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EMT 251 Replacement Display - Hi Res Color TFT Graphics

via this auction
Not a synth, but it should be.
This one in via Joel.

auction details (note this is not this Studio Electronics from what I can tell): "The EMT 251 Digital Reverbs are great units but nearly every model now suffers a burned out display. Finally, after many inquiries from frustrated 251 owners, we now offer the DJRS 251 Color display, designed by Doug Jane. With its bright, high contrast color graphics, the DJRS 251 is a big improvement over the old dim, monochrome display. If you've got a 251 with a dead or dying display, this nice upgrade will make the EMT 251 a real pleasure to use and will substantially increase the value of your machine.

Installation is fairly simple and can be done by anyone with with basic tech skills in about 3 hours. Your original black housing, front panel (with EMT logo), and side mount pieces will be re-used. The illustrated 12 page manual gives clear, step by step instructions. You take off the top assembly, remove the old display, and unsolder two wires. The PCB is removed and the new PCB and display are installed, using a cable adapter. Now four DIP switches are set –– three select the display time out mode and the fourth selects “250 or non 250” software. Reinstall the top assembly, and you're done! Includes new PC board with display, adapter cable, and installation manual.

If you're an 251 owner in Southern California and you'd rather that we do the upgrade, it's not a problem. The install, including a general check out and calibration, is about $275. For more information about this product, please contact us.

We also sell upgrade kits that add the EMT 250 reverb program to 251's. For info and pricing, please contact us.

Studio Electronics, Inc. has served the pro audio industry since 1981. We run one of the best equipped service repair shops in North America, with a vast parts inventory and an extensive library of documentation on all types of audio gear -- from the 1950’s to present day. We are an authorized service center for several manufacturers, and offer expert service on all kinds of vintage pro audio gear including EMT, AMS, UREI, Pultec, Eventide, API, Neve, and many others. We’ve installed over 250 studios -- everything from small project studios to large scale projects for firms like Warner Brothers and Disney. We’re proud of our reputation in the pro audio community. You can get more info about us by searching for Studio Electronics Burbank on the web."

Sold For: not sold