This Echoplex EP-4 Tape Echo is part of the private collection of Moby.

In the mid-1970s, Market created an upgrade to the EP-3, designated the EP-4, adding features such as an LED input meter and tone controls and dropping the sound-on-sound feature.

The EP-4 has an added output buffer to help improve impedance matching with other equipment. A compressor board based on the CA3080 transconductance amplifier was added to the record circuit of both the EP-3 and EP-4 models for a short while after the EP-4 model was introduced and then the compressor board was dropped from both the EP-3 and EP-4 models.

The EP-3 model was also offered for sale alongside the EP-4 model after the EP-4 was introduced. Battle's final consulting with Market yielded the EM-1 Groupmaster, which offered a four-channel input mixer section and a mono output section.

Dissatisfied with the transistor-minded direction Maestro was taking, Butts left the company.[2] In the mid-1970s Maestro also created the ES-1 Sireko (pronounced "Sir-Echo"), a simplified, echo-only unit with a bin-loop cartridge system.

Serial: 36119. A worn machine that will need some servicing to get back up to 100%. Currently in Fair condition.

All items in Moby's Collection ship fully insured with delivery confirmation and include a signed and embossed Certificate Of Authenticity from Moby