PREAMP: Because the "Early" EP-3 models total less than 500 units, it's very likely that most people have never experienced the sweep of this control, but here goes. Instead of being a standard volume control, the Preamp control pans between two different signal paths: the combination of the preamp and the mixer circuit, and something similar but different. The result is a volume control on the first half, and a rudimentary frequency enhancement on the second half. Anything above noon on the Preamp control will gently push different frequency bands, with the most perceived loudness halfway between 2 and 3 o'clock. Think of it as a pickup selector control or or a very unique EQ control.

BOOST: While the Preamp knob and accompanying circuitry gives you the magic, the Boost control takes the versatility to the next level. When set all the way counterclockwise, the signal is at unity gain (plus wherever the Preamp knob is set); there is no boost happening. As you roll it up, the Boost control sets the gain level of the preamp, adding a ton of sparkle and volume which can shake hands with the most stubborn of amps. Set your amp right on the verge of breakup, set the Boost to taste and watch even the most sterile rig spring to life.

The Epoch Boost requires a 9VDC supply with 18mA of CURRENT. You can, of course, give the Epoch Boost more current than it needs. However, because of the charge pump circuit, do NOT run the Epoch Boost on anything higher than 9V. Bad things will happen, including and not limited to your warranty being voided.