Catalinbread Epoch Bias Boost, Overdrive, and Preamp Pedal

Sale price$179.99



The Maestro EP-3 Echoplex has been responsible for some of the most iconic tones in rock history. In 2020, we delivered a pared-down version of that preamp with the Epoch Boost. The all-new Epoch Bias expands on that circuit with a couple of crucial differences. The Bias control simulates out-of-spec parts on the original, adjusting the base gain and body of the EP-3, which adds only a trivial amount of gain on its own. The new Filter control brings you the best of the early and late model EP-3, with a tasteful treble cut that lets you adapt the pedal to your rig and tone. Join us and experience the most refined version of the effect that launched a thousand discographies.


  • Preamp: This essentially acts as the “Volume” knob from the EP-3, which is to say it’s not a volume knob at all. That control was named such because it was the mix knob for the tape echo output, mixed with some of the “loading-down” of that echo side. At its core, it is a wet-dry mix control. But because there’s no echo here, the knob pans between “nothing” and the preamp. And when this knob is down, that’s exactly what you hear: nothing. It sounds like a volume control until noon, and beyond that, it imparts some subtle frequency enhancement, on account of the loading simulation circuit. The loudest point on this knob is at about 2 o’clock.
  • Boost: Adds extra gain and volume to the circuit. When this control is set down, it simulates the stock EP-3 circuit.
  • Bias: The original EP-3 pre-circuit had a fixed gain and volume, dependent on one resistor value in the circuit. But because part tolerances were all over the place at the time of the EP-3’s release, there was quite a bit of variance in the overall gain in the preamp. This knob lets you dial that value in, to run the circuit hot or cold. Think of it as a gain control and a body enhancer. This control also makes light crackling noises as it is being turned, this is normal.
  • Filter: The first few hundred EP-3 units that came off the assembly line featured a slightly different preamp circuit than the rest, a little brighter than stock. And when we say “a little”, we mean it. The Filter control adds a tastefully-designed and gentle hi-cut filter that purposefully exaggerates the differences a little more than either mode, for a more refined, bluesier tone that sounds great regardless of knob position.


  • Type: Preamp/Bias
  • Weight: .4 lbs.
  • Product dimensions: 1.96" X 2.36" X 4.33"
  • Inputs:1 x 1/4"
  • Outputs:1 x 1/4"
  • Power Source: 9V DC

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