Butler Audio

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  • Butler Audio Tube Driver
    This is my original TUBE DRIVER. I designed it in the early 1980s and Eric Johnson was one of my early customers. Thanks to his early endorsement as the creator of his famous "Violin Tone", my TUBE DRIVER has become a standard of many pro musicians the world over. I build a few of these per week ..
  • Butler Audio Tube Driver with Bias Knob
    Years ago, Eric Johnson requested that I install an extra pot in some of his Tube Drivers to help him match the tube response to his super critical hands and ears. My solution was to install a 5th control that controls the tube cathode current and enables him to ‘dial in’ the tube characteristics..