Audio Research VSi-55

Excellent condition integrated amplifier.
The push-pull VSi55 delivers 50Wpc via output taps for both 4- and 8-ohm speaker loads. Audio Research calls the VSi55's design "enriched" class-AB1. This class-AB operation keeps a significant amount of current flowing through the tubes even when idle. This idle current is higher than average for a class-AB design, hence the "enriched" qualifier and a factory-set bias level of 65mA per 6550 tube.
The VSi55 accepts five input sources including CD, tuner, and video, plus two additional single-ended RCA connectors. The unit has a 1V summed-output subwoofer connector. One set of gold-plated five-way hex-net binding posts for each channel features thick lugs that are easy to grip and clamp down onto fat spades. Also included is a 14-gauge IEC-style detachable power cord. The VSi55 measures 14"W x 16"D x 8"H and weighs 34 pounds.