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Especially when tubes are used in amplifiers that do not employ any feedback
it is important to use selected pairs. Differences in the gain of the tubes could
lead to audible differences in loudness between the two channels of a stereo set.
List of PHILIPS factory codes. I have corrected this list
but it is still open for any corrections / additions
OpenOffice-Draw format.
Picking Capacitors
Article from "AUDIO" 1980 by Walter Jung and Richard Mersh
ZIP containing 16 pages, scanned from photocopies