Some enthusiasts, such as Nelson Pass, have built amplifiers using transistors and MOSFETs that operate in class A, including single ended, and these often have the "tube sound".
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But there are exceptions, for example designs such as the Zen series by Nelson Pass.
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In 1982, Tom Scholz, a graduate of MIT and a member of Boston, introduced the Rockman, which used JFET/BJT-based operational amplifiers and diode-based clipping circuits, but achieved a distorted sound adopted by many well known musicians.
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Some individual characteristics of the tube sound, such as the waveshaping on overdrive, are straightforward to produce in a transistor circuit or digital filter.
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