Radial makes three types of ABY switchers to suit various price points and feature sets. The most cost effective is the BigShot ABY as this is a passive true-bypass switcher with extra features that you do not find on others including an isolation transformer and polarity reverse function. The Twin City adds electronic switching and buffers for greater signal control and less switching noise. The Switchbone further advances the functionality with photocell switching, power booster and tuner out.

Feature BigShot ABY™

BigShot ABY
Twin City™


Circuit type Passive True-bypass Class-A buffered Class-A buffered
Switching type Mechanical switch Electronic switch Photocell switch
Transformer isolation Yes - passive Yes - active Yes - active
Polarity reverse Yes Yes Yes
LED indicators No Yes Yes w/smart function
Tuner out Yes - passive No Yes - active
Power booster No No Yes, variable
Mid boost No No Yes, 3 position
Tuner mute function No No Yes
Power requirement None 9V supply 15VDC supply (included)

BigShot ABY

The BigShot ABY is a simple passive, true-bypass switcher. This is used by artists such as Buddy Guy and Luther Dickenson of the Black Crows for their amp switching. It features standard ABY connectivity with a tuner out and the added option of inserting an isolation transformer into the signal path. This can be used to eliminate ground loops. Once engaged, this also enables you to reverse the polarity on output-B to phase-align the two amps. It features heavy duty 14 gauge steel construction for added durability.

Twin City

The Twin City is an ultra compact active switcher that is equipped with Drag Control load correction for optimal tone. The buffered circuit is designed to drive long cables without noise. Transformer isolation on output-b eliminates ground loops that are common with most ABY switchers. Electronic switching is employed for quiet pop free switching, even when used with high gain amps. It employs standard Boss style 9V powering making it easy to integrate into pedalboards. It is used by Willie Alder of Lamb of God.


The Switchbone is likely the world's best ABY switcher. It features 100% discrete class-A circuitry with Drag Control load correction for optimal signal transfer. A built-in power booster adds greater flexibility while the mid range boost can add extra body to the tone for more sustain. Transformer isolation with polarity reverse and ground lift assures hum and buzz from ground loops are eliminated and photocell switching delivers the quietest performance, even when used with ultra high gain amps.