Radial Bones Twin City A-B-Y Amp Switcher

Active ABY Amp Switcher Pedal with Load Correction, Polarity and Ground Lift Switches, Two Footswitches, and Isolated Output
5/5 16 Write review Item ID: TwinCityABY
Radial Bones Twin City A-B-Y Amp Switcher image 1
Radial Bones Twin City A-B-Y Amp Switcher image 1
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Radial Bones Twin City A-B-Y Amp Switcher
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Make Your 2-amp Setup Work Like a Charm!

The Radial Bones Twin-City ABY amp switcher lets you connect to two amps simultaneously — and run them both with no extra noise or signal loss! The Bones Twin-City includes both an ABY switcher and a buffer as well as Radial's Drag Control load correction circuitry, which lets you eliminate signal loss. This amazing box includes a pedal that lets you toggle between amps as well as a pedal to select both outputs. It also includes an isolation transformer, to eliminate hum and buzz from ground loops. Get the most out of your 2-amp setup, with the Bones Twin-City!

Radial Bones Twin-City Active ABY Amp Switcher Pedal at a a Glance:
  • Essential for your 2-amp setup
  • Eliminate hums and buzzes
  • Take it on the road

Essential for your 2-amp setup
The Twin-City 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 (TM) 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.

Eliminate hums and buzzes
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 180-degree polarity reverse switch that ensures both amplifiers play in phase while noise is reduced to an absolute minimum even when using older vintage amps, which 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.

Take it on the road
Like all Radial products, the Bones are constructed from heavy 14 gauge steel for road-ready reliability. For even greater durability, the Twin-City employs Radial's Electronic Impulse Switching. EIS gives Bones pedals 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.

Radial Bones Twin-City Active ABY Amp Switcher Pedal Features:
  • Buffered ABY with Drag load correction
  • Isolated output eliminates hum and buzz
  • 18-degree polarity sets both amps in phase
  • Compact design for an easy fit on any pedalboard
  • Toggle and Both footswitches
  • Requires PSA-120S power supply, not included
The Radial Bones Twin-City ABY amp switcher makes a perfect addition to your 2-amp setup!

Tech Specs

Type I/O Selector
Inputs 1 x 1/4"
Outputs 2 x 1/4"
Height 4.5"
Width 3.5"
Depth 2"
Manufacturer Part Number R800 7115 00

Customer Reviews

Based on 16 reviews
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Amazing Pedal

Amazing pedal. I bought this based on the reviews with scepticsm. No latency, no tone loss, no noise and built like a tank. I run this with original 1968 Fender Princeton Reverb and Orange Tiny Terror and 12" cab. Have combo of super clean chime and quack and crunchy gains. Knowing what I know now I wish I had bought this before dumping a grand into other pedals. Just two amps and this pedal will get you there. If you have a bunch of pedals put this in front of your chain with pedals dedicated to each amp. The two amps together are sick. Higher end brought out by Fender and lower end by Orange. The stereo sound will send send your head to another place. Get it, you won't regret it! My pedal chain includes: Xotic RC>AC>Electro Harmonics OD Glove>TE Vicious Vibe>HOF>Delay>Xotic Wah>Twin City. Powered by Voodoo Lab....Dead Quiet
Music background: Years of playing

Switching without the Noise

Pros: No bleed through between the channels. The phase and lift switch take the Twin-City over the top. Silent switching. This pedal is built like a tank - road worthy for sure. I'm a believer. Cons: It is pricey for an ABY pedal, but it is the last one you'll have to buy to switch between your amps.


I have looked for an A/B box for several years. All were too noisy and seemed to load the other amp. With this piece this is no hum or any noise at all. It does not take away signal. Your instrument will sound like straight to an amp or console.
Music background: Jack of all trades!

The best pro-rig ABY for the road and studio

I've had mine several years now and could not be happier with it. Very useful for my usual set-up. Does everything I need. I use mine at the end of my pedal board to either ABY between two amps, or to ABY between two channels (like on a Vox AC30 normal and/or top boost, or Hiwatt, etc.) and the 180 Degrees polarity switch eliminates speaker phase issues when using a very old tweed with a newer amp, also, the Lift switch eliminates ground loop hum issues between amps. The load correction feature eliminates "dead-dynamics" issues encountered with most cheap ABY switchers. It's heavy steel case and solid build is world tour ready. Radial does not make a bad anything. In fact, they are one of the best pro gear makers on the planet. They seem to specialize in building real-world solutions for real working musicians common gear issues. I would send them a Christmas card every year if I ever sent out cards.
Music background: Blues, rock, pop, live, studio

Radial Bones Twin City Rocks!

I have bought several AB-Y amp switchers now, looking for one that would work well, with very little or no noise or hum and no signal reduction or degradation. I also wanted one that wouldn't pop when the switch was pushed. All of the other AB-Y switchers that I own have these problems. Some are worse than others but they all exhibit some or all of the issues listed above. When I received this one I was hoping it would be better than the others. I was completely amazed at how quiet this switch is. I first tried it with my acoustic guitar going to two of my acoustic guitar amps. It was dead quiet with no popping when I switched between amps. I also couldn't hear any signal reduction of degradation. This switch rocks! It is exactly what I have been looking for.
Music background: Small recording studio, 30 years of guitar playing.
See also: Footswitches, Radial, Radial Footswitch / Selector Pedals