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Published in:
2011 | OriginalPaper | Chapter
24. The Hum Figure of Linear Amps
Author : Dipl.-Ing. Burkhard Vogel
Published in: The Sound of Silence
Publisher: Springer Berlin Heidelberg
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Abstract
The frustration that immediately follows hum and noise (H&N) that may come out of the loudspeaker-amplifier chain in the gap between music titles begs the question of “how to measure or calculate the hum artefact content of the output noise of a power (or any other linear) amplifier with input shorted and output loaded with the rated load?”.
Gaps between CD music titles or from other low-noise sources should be hum- and noise-free. There could be one exception: vinyl records plus phono-amp. In most cases, their H&N level “marches” 1:1 through the whole amp chain, thus, producing the Signal-to-Noise ratio at the phono-amp’s output without major increase at the output of the power amplifier (PA) as well.