AUDIO RESEARCH LS28 TRIODE STEREO PREAMPLIFIER $8,500 REVIEW

September 1, 2019 § Leave a comment

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“THD+N vs. Frequency yields the following graph. It always stays below 0.08%. The two channels are slightly different, but that is just the way tubes behave. Because the tube is electro-mechanical (filament, grid, plate), and because the tube gets hot during use, performance is slightly variable from tube to tube. These small differences are only measurable on a spectrum analyzer. They are not audible.

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