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A BK Butler Tube Driver guitar effects pedal in a rectangular steel enclosure, with a row of rotary knobs across the top panel, two small LED indicators, and a footswitch at the front.

BK Butler Tube Driver w/ Bias Knob - 2018

$321.95USD

Checkout with Envoy Music. This item may be dispatched by an approved fulfillment partner.

Best for

Players who want a real 12AX7 tube overdrive/boost with fine control over feel and gain. The 5-knob Bias version is best for tone-tweakers who like to dial in the tube's response without physically swapping tubes, and for anyone chasing the classic Tube Driver overdrive voicing. The two-band Hi/Low EQ suits players who want to shape the overdrive to a specific pickup and amp pairing.

Who should skip

Anyone building a compact, battery- or 9V-powered pedalboard: this pedal plugs into a 120V AC wall outlet via an attached mains cord and won't run from a pedalboard power supply or daisy chain. It is also large (about 7.25 x 4 x 3.5 in) and heavy (2.5 lb) for a single overdrive, so skip it if board space or weight is tight. Buyers who require true-bypass switching should confirm it with the seller, since it isn't specified.

Watchouts

Power is the main gotcha: it draws from 120V AC mains through a fixed three-prong cord and has no on/off switch, so it can't share a normal pedalboard power supply and needs its own wall outlet (or the 220-240V export build for other regions). Small knob movements produce large tonal changes, so it can be fiddly to set. The manufacturer's 3-year warranty is quoted for new units and may not apply to this used 2018 example, so confirm condition, tube life, and voltage configuration with the seller before buying.