The Usher R-1.5 stereo amplifier is built like a tank. Its utilitarian industrial design bears a striking resemblance to the Threshold 300 Stasis designed by audio guru Nelson Pass, which should come as no surprise. In 1972 Usher Audio's owner and head engineer Lien-Shui Tsai built the first Usher R-1.5 amplifier as a copy of … Continue reading The Bargain Class A Usher R-1.5 Stereo Amplifier - A High Performer at Any Price!