Radial Engineering Twin-City
Bones Active AB/Y Buffered Switcher Pedal

OUR PART #  TWIN-CITY-BONES

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Radial Engineering's Tonebone Bones Twin-City is an active AB/Y switcher and buffer that enables you to connect any two amps and drive them simultaneously without noise, loss of gain and without degrading your natural guitar tone. This is accomplished with Radial's highly acclaimed buffering technology and the same Drag™ control load correction circuitry as used in the award-winning Radial JD7 Injector. The 'set and forget' Drag control lets you compensate for cable signal loss and introduce the perfect amount of loading to replicate the way your guitar and amp interact.

To eliminate hum and buzz from ground loops, the Twin-City is equipped with an isolation transformer on output B. This is augmented with a ground lift switch and 180º polarity reverse switch that ensures both amplifiers play in phase while noise is reduced to an absolute minimum even when using older vintage amps that are generally more prone to noise. As a buffer, the Twin-City lowers the impedance and susceptibility to noise, making it the ideal signal driver for large stages when using long cable runs.

Like all Radial products, the Bones is constructed from heavy 14 gauge steel for greater durability and added 'stay put' when kicked around on a busy stage. For even greater durability, the Twin-City employs our latest EIS – Electronic Impulse Switching – for unmatched performance without the challenges posed by mechanical switches. Bright, easy to see LEDs deliver on-stage switching cues so you know exactly where you are at all times.

As most players employ pedalboards, the Twin-City features standard 'Boss style' 9V powering that will adapt to most multi-pedal power supplies. The ultra compact design with top mounted output and DC connections allow pedals to be placed close together for those wishing maximum pedalboard density.

The Twin-City is a powerful AB/Y switcher that delivers all of the natural tone, punch and clarity of a true-bypass device without the popping noise of mechanical switches or the induced hum and buzz caused by ground loops.

NOTE: Instruments and amplifiers shown in diagrams above are sold separately

Radial Engineering Bones Twin-City Features:

  • Buffered AB/Y with Drag™ load correction
  • Isolated output eliminates hum and buzz
  • 180º polarity sets both amps in phase
  • Compact; fits on any pedalboard
  • Standard 9-volt power supply operation

Radial Engineering Bones Twin-City Functions:

  • IN: 1/4" input jack for your guitar
  • DRAG™: Reintroduces the natural loading that occurs between your amplifier and the guitars pickups. Start with DRAG set to 12 o’clock. Use your guitar pick like a screwdriver to move the control until it sounds right to you
  • OUT-A: 1/4” jack connects to amp-A. For safe operation always connect to a properly grounded guitar amp equipped with a 3-prong A/C power cord. See the warning on the other side of this manual
  • OUT-B: 1/4” jack connects to amp-B. This output is transformer isolated to eliminate hum and buzz caused by ground loops
  • PSU: Connection for 9-12 volt DC (center pin negative)
  • A/B STATUS LED: Two (2) LED status indicators display the active amp while in single output mode
  • TOGGLE: Footswitch selects between amp-A or amp-B while operating in single-amp mode
  • BOTH: Footswitch activates both amps. An LED status indicator illuminates when dual-amp mode is active
  • LIFT: Disconnects ground at OUT-B to further reduce noise
  • 180°: Polarity reverse switch inverts the signal phase of OUT-B to ensure amps are in-phase and their speakers are moving in the same direction.

Radial Engineering Twin-City
Bones Active AB/Y Buffered Switcher Pedal

OUR PART #  TWIN-CITY-BONES

Product Information:

Radial Engineering's Tonebone Bones Twin-City is an active AB/Y switcher and buffer that enables you to connect any two amps and drive them simultaneously without noise, loss of gain and without degrading your natural guitar tone. This is accomplished with Radial's highly acclaimed buffering technology and the same Drag™ control load correction circuitry as used in the award-winning Radial JD7 Injector. The 'set and forget' Drag control lets you compensate for cable signal loss and introduce the perfect amount of loading to replicate the way your guitar and amp interact.

To eliminate hum and buzz from ground loops, the Twin-City is equipped with an isolation transformer on output B. This is augmented with a ground lift switch and 180º polarity reverse switch that ensures both amplifiers play in phase while noise is reduced to an absolute minimum even when using older vintage amps that are generally more prone to noise. As a buffer, the Twin-City lowers the impedance and susceptibility to noise, making it the ideal signal driver for large stages when using long cable runs.

Like all Radial products, the Bones is constructed from heavy 14 gauge steel for greater durability and added 'stay put' when kicked around on a busy stage. For even greater durability, the Twin-City employs our latest EIS – Electronic Impulse Switching – for unmatched performance without the challenges posed by mechanical switches. Bright, easy to see LEDs deliver on-stage switching cues so you know exactly where you are at all times.

As most players employ pedalboards, the Twin-City features standard 'Boss style' 9V powering that will adapt to most multi-pedal power supplies. The ultra compact design with top mounted output and DC connections allow pedals to be placed close together for those wishing maximum pedalboard density.

The Twin-City is a powerful AB/Y switcher that delivers all of the natural tone, punch and clarity of a true-bypass device without the popping noise of mechanical switches or the induced hum and buzz caused by ground loops.

NOTE: Instruments and amplifiers shown in diagrams above are sold separately

Radial Engineering Bones Twin-City Features:

  • Buffered AB/Y with Drag™ load correction
  • Isolated output eliminates hum and buzz
  • 180º polarity sets both amps in phase
  • Compact; fits on any pedalboard
  • Standard 9-volt power supply operation

Radial Engineering Bones Twin-City Functions:

  • IN: 1/4" input jack for your guitar
  • DRAG™: Reintroduces the natural loading that occurs between your amplifier and the guitars pickups. Start with DRAG set to 12 o’clock. Use your guitar pick like a screwdriver to move the control until it sounds right to you
  • OUT-A: 1/4” jack connects to amp-A. For safe operation always connect to a properly grounded guitar amp equipped with a 3-prong A/C power cord. See the warning on the other side of this manual
  • OUT-B: 1/4” jack connects to amp-B. This output is transformer isolated to eliminate hum and buzz caused by ground loops
  • PSU: Connection for 9-12 volt DC (center pin negative)
  • A/B STATUS LED: Two (2) LED status indicators display the active amp while in single output mode
  • TOGGLE: Footswitch selects between amp-A or amp-B while operating in single-amp mode
  • BOTH: Footswitch activates both amps. An LED status indicator illuminates when dual-amp mode is active
  • LIFT: Disconnects ground at OUT-B to further reduce noise
  • 180°: Polarity reverse switch inverts the signal phase of OUT-B to ensure amps are in-phase and their speakers are moving in the same direction.
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