{"product_id":"gm-bk-butler-911-tube-driver-reissue-with-bias-knob-bk-butler-tube-driver-f3d9e992","title":"BK Butler Tube Driver w\/ Bias Knob - 2018","description":"\u003cp\u003eThe BK Butler Tube Driver is a hand-built analog overdrive\/boost pedal that runs the guitar signal through a 12AX7 vacuum tube in a starved-plate configuration. This unit is the five-knob \"Bias\" version, which adds a fifth control that adjusts the current applied to the tube's cathode, letting the player vary gain, texture and dynamics without swapping tubes. The standard controls are Output Level, a two-band EQ (Hi and Low) and Tube Drive, plus a footswitch and two LED indicators for power and engagement. It is powered directly from 120V AC mains through an attached three-prong power cord rather than a standard pedalboard power supply.\u003c\/p\u003e","brand":"BK Butler","offers":[{"title":"Default Title","offer_id":50199485481206,"sku":"GM-F3D9E992","price":321.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/2882\/7894\/files\/05395ff9-97a6-4522-972e-10a7fdce2ac4.jpg?v=1775071295","url":"https:\/\/envoy-music.myshopify.com\/products\/gm-bk-butler-911-tube-driver-reissue-with-bias-knob-bk-butler-tube-driver-f3d9e992","provider":"Envoy Music","version":"1.0","type":"link"}