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Engineering Brief

Harmonic Distortion Analysis in a Class-AB Tube Amplifier: The McIntosh MC-240

Authors: Minnick, Phillip

AES Convention 131 · Paper 28 · October 2011

Abstract

Some Class-AB tube amplifiers remain in demand for audiophiles due to their linear gain stages, low feedback, and minimal high-order harmonic distortion. The McIntosh MC240 Class-AB tube amplifier is a benchmark, high-quality stereo amplifier from the 1960s. This presentation gives an overview of the restoration of the amplifier to achieve a satisfactory level of performance, examination of the electrical topology in relation to the output signal’s distortion characteristics, and detailed analysis of the distortions produced by the amplifier using psychoacoustic-based listening tests as well as standard benchmark tests.

Details

Published in
AES Convention 131
AES Convention
131
Paper number
28
Publication date
October 6, 2011
Affiliation
University of Miami (See document for exact affiliation information.)
Type
Engineering Brief

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