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BigShot ABY True-Bypass Amp Switcher

The BigShot ABY™ is a compact true-bypass ABY switcher that enables you to switch between two amplifiers or play through both amps at the same time, while eliminating buzz and hum from ground loops.

Designed for the purist, this true-bypass ABY switcher is completely passive meaning that there are no tone altering buffers in between the guitar and the amplifier. With the BigShot ABY, you get the pure tone from your guitar plugged direct into your amp! To add versatility, the BigShot ABY is also equipped with a separate tuner out. This 'always on' output feeds your tuner for constant monitoring while keeping it out of the signal chain. Should you experience hum and buzz problems due to ground loops, the BigShot ABY comes to the rescue with a built-in isolation transformer and ground lift switch. Once engaged, you can toggle the polarity of the second amplifier to ensure both amps play in absolute phase.

In use, the BigShot ABY is both simple to use and efficient on stage. When powered by an external 9V supply or pedalboard power brick, full size super-bright LEDs spring to life to provide instant on-stage amplifier status readout. When power is unavailable, the passive audio signal path still works, unaffected. The compact yet ultra-rugged design makes the BigShot ABY ideal for pedalboards where space is always at a premium.

The BigShot ABY... the most versatile true-bypass switcher made today!


  • Circuit Type: Passive, true bypass
  • Frequency response: 20Hz - 20KHz
  • Gain: -.3db
  • Phase response: < 1 degree
  • Switching: 100% passive


  • Output-A: Direct output
  • Output-B: Switchable transformer isolated or direct output
  • Tuner output: Always-on 1/4" jack
  • LED indicators: Large 3mm OD ultra-bright LED's
  • Ground Lift: Lifts ground at Output-B
  • Polarity reverse: 180 degree (phase) reverse at Output-B
  • ISO switch: Engages isolation transformer on Output-B


  • Power Supply: 9VDC, center pole negative
  • Construction: 14-gauge steel
  • Finish: Durable powder coat
  • Size: 3.6"w x 3.9"l x 2"h
  • Weight: 1.25 lb (0.56 kg)
  • Conditions: For use in dry locations only between 5 degC and 40 degC
  • Production: Made in Canada

Features Breakdown

  • True-bypass ABY amp selector with LED indicators
  • On-board transformer to eliminate hum & buzz
  • 180° polarity reverse to phase-match amps
  • 100% passive audio path, does not require power