During the s and s, the company produced high-quality amplifiersradio tuners, loudspeakers the LEAK Sandwichpickups, arms and a turntable. In September the company released the first of the "Point One" series of amplifiers, so named because the total harmonic distortion was 0. During the latter part of the Second World Warthe company started developing amplifiers that made extensive use of negative feedback to achieve very high performance. This article does not cite any sources. Please help to improve this article by introducing more precise citations. This Japanese amatuer leaked includes a list of referencesrelated reading or external linksbut its sources remain unclear because it Japanese amatuer leaked inline citations.