Servo 120a is a compact, 1U rackmount stereo power amplifier delivering 60 W per channel into 4 Ω and 50 W per channel into 8 Ω, with 120 W bridged at 8 Ω. It features independent left/right input level controls, 10-segment LED meters, a protection LED, and a headphone jack with speaker mute for private cueing. A bipolar design with a toroidal power supply and convection cooling provides quiet, reliable operation in studio or installation environments.