![]() The Bias control also adds dynamics and allows you to custom match your Tube Driver for any particular pickup/amp combination.Technically it varies the electrical 'strength' of the tube and that affects gain, texture and dynamics. Just go up or down a few clicks and he nails what he wants. Eric Johnson used to spend a lot of time looking for perfect tubes to use in his standard Tube Drivers, but now he can just set the bias easily with the stock tube. Very versatile.The Bias control is very helpful as it adjusts the amount of current applied to the cathode of the tube. It has the special Bias knob modification done by Butler himself. It is autographed by BK Butler himself with an engraving on the back. This is an excellent pedal in great shape. Pedal Auction Description: Up for Auction is an authentic BK Butler Tube Driver Special 5 knob Bias Mod.
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