This is a discussion about what the terms of Linear and Ultra-Linear mean with respect to tube amplifiers. Once we understand the differences between the two, it should help with evaluating schematics and determine if they are truly ultra-linear. Transistor are discussed briefly and how they are not that dis-similar to design of tubes with regard to harmonics.

Original Work, Copyright 2019 James D. Whiteside, II all rights reserved, For consideration only, no reproduction without prior permission.

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