Active ABY Amp Switcher
The Twin-City is an active amp selector that lets you connect any two guitar amps and switch between them or drive them both simultaneously without noise, loss of gain, or any degradation to your natural guitar tone.

Active ABY amp switcher & Class-A buffer
Isolated output eliminates hum and buzz
180 polarity reverse to phase-match amps
Drag Control load correction for natural tone

Active circuitry for noise-free switching
The Radial Twin-City uses a class-A input buffer to drive the amp outputs, which reduces susceptibility to noise and allows for completely silent switching on stage. To eliminate hum and buzz from ground loops, the Twin-City is equipped with an isolation transformer on output-B, along with a ground lift switch and 180 polarity reverse switch that ensures both amplifiers play back in phase with each other. At the input, Drag Control load correction allows you to recreate the natural load on the pickups as if you were connected directly to a tube amplifier, allowing the natural tone of your instrument to shine through.

Specifications
Audio Circuit Type: Class-A discrete FET buffer circuit
Frequency Response: Tailored for guitar
Clip Level: +9dBu (Input), +9dBu (Output)
Total Harmonic Distortion: <0.003% @ 1kHz
Intermodulation Distortion: 0.003%
Input Impedance: Varies with Drag Control, 22k to 1Meg Ohm
Output Impedance: 1000 Ohms
Noise Floor: -90dBu

Features
180 polarity reverse, Drag Control

General
Construction: 14-gauge steel
Size (L x W x D): 3.5" x 4.4" x 2.17" (89mm x 112mm x 55mm)
Weight: 0.9lb (0.42kg)
Shipping Size (L x W x D): 6.25" x 4.5" x 2.5" (158.75mm x 114mm x 63.5mm)
Shipping Weight: 3.4lb (1.55kg)
Power: 50mA, 9VDC (center pin negative)
Conditions: For use in dry locations only between 5C and 40C
Warranty: Radial 3-year, transferable