Arguably the first digital reverb, the EMT 250 Electronic Reverborator was developed by German company Elektro-Mess-Technik (EMT) in 1976. In addition to reverb, it offered digital delay, echo, chorus, phaser, and “space” effects. By modern standards, the device is a relic, fitted with only 16KB of RAM, using odd-looking levers to set parameters, and containing three internal fans and a giant heat sink. Nevertheless, it is still prized today for its warm, modulated sound, and many current hardware and plug-in reverbs offer some sort of take on the EMT 250 sound. Only 250 EMT 250s were made, so they are rare and expensive if you can find one.
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