Maestro Echoplex EP-3 (1970–?)
The EP-3 is the solid-state Echoplex. It took Mike Battle's tape-echo design off tubes and into transistors, debuting in 1970 as the next update in the line. That made the unit considerably more durable and affordable than its tube-driven ancestors, and the EP-3 went on to become the tape delay by which other delays are measured. Players fixate on the preamp section. It has a warm coloration that's been called the secret sauce of legions of players, and early-production EP-3s with the "holy grail" preamp circuit are the ones collectors chase.
The tape-transport layout is the classic Echoplex arrangement - a sliding playback head on a track sets the delay time, rather than a knob. Delay runs roughly 80 to 800 milliseconds, though the mechanical nature of the thing means it varies unit to unit. Controls are sustain and volume knobs, the delay slider, and a toggle for echo versus sound-on-sound. In sound-on-sound mode the erase and record heads can be switched off, so you can layer new playing over what's already on the tape. Around back there are input and output jacks plus footswitch jacks for echo on/off and playback. Early units came in a laminate pine cabinet with a black top.
The factory service manual covers the EP-3 alongside the EP-4 and the Sireko ES-1. The EP-3 shipped in at least two electrical generations. A service bulletin from October 1979 addresses a solid-state EP-3 variant for roughly serial numbers 23,700 through 24,000, and the same bulletin sets warranty handling at serial 35,900 (below that, Moog Music; above, Market Electronics). Serial numbers in the 34,000s turn up on 1975-dated examples. Documentation beyond that is thin: no original retail price, no dimensions or weight, no published frequency response or S/N figure, and no production end year are recorded here. Contemporary effects coverage in EQ Magazine (April 2002, p.98) noted that modern modeling processors emulate numerous sought-after vintage effects units like this one. The manual notes a signal-to-noise ratio better than 50 dB when levels are set properly. Jimmy Page is the name most associated with it, and working units are still serviced by a small circle of specialists.
- Type: solid-state analog tape delay (tape echo)
- Introduced: 1970
- Delay time: approx. 80–800 ms, unit-dependent
- Controls: sustain, volume, delay slider, echo/sound-on-sound toggle
- Jacks: input, output, echo on/off footswitch, playback footswitch
- Notable: erase/record heads defeatable for sound-on-sound; replaceable three-minute tape cartridge
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