Leak TL/12
The first commercially produced amplifier with distortion of 0.1% was the LEAK Type 15 "Point One" of 1945, using KT66 vacuum tubes (valves) connected as triodes, with 26dB feedback over 4 stages including the output transformer. In 1948 LEAK produced the TL/12 which was also rated at 0.1% but featured improved performance with 26dB over 3 stages and the output transformer (giving better gain-margin and phase-margin). The TL/12 sold in large quantities to professional users, radio stations, laboratories, as well as to the emerging market for hi-fi equipment. It is highly-prized even today by audio enthusiasts.
Read more about this topic: List Of Valve Amplifier Designs
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