I had acquired a pair of large, inefficient Acoustic Research (AR) 310 floor standing speakers. They required more driving power than my SET amplifier could supply. I recalled that UL amplifiers produced more power output than SET amplifiers while exhibiting low third-order harmonic distortion like their SET counterparts. I decided to construct a UL amplifier and see for myself. This article describes basic UL theory and gives construction details of the UL amplifier that I now use with my AR 310s.
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UL Theory Booklet