The Echoplex hardware boxes employed an infinite tape loop combined with a sliding record head, allowing the user to set the desired delay length. The endless tape loop is housed in the white cartridge in the photo above. The tape is a special self-lubricated formula and is wound in the cartridge with the oxide facing out. This approximately seventy-five foot tape travels clockwise around both the cartridge and tape deck. It exits the inside of the loop through the diagonal slit in the cartridge and heads into the white plastic reversing idler wheel on the right. The Echoplex wasn't notable just for the delay, but also for the sound; it is still a classic today.
