A HIGH-PRECISION TUBE PHONO PREAMP
by Fred Nachbaur, Dogstar Music ©1998, 2001

3: HOW IT WORKS

The sections that follow step through the principles of operation of this design. Since it is quite different from traditional designs, I suggest that you follow through this at least once. If the "fine points" are over your head, don't worry about it; hopefully enough of the information will stick to give you at least a working understanding of the circuit.

There are in-line illustrations of the schematic, repeated as necessary. (If you have caching turned on in your browser, you'll only have to actually download the images once.) These "Figures" (schematics) are shown here in reduced size. Click on the image to enlarge it, preferably by right-clicking and opening the image in a new window. Full-size, printable versions are also available in the Resources section. It is highly recommended that you print out these files and have the diagrams at hand as you study this document, especially if you plan on actually building yourself one of these units.

Note that in the schematic diagrams, only one channel is shown; the other channel is of course identical. Please note that part numbers refer to the various sections as follows: (We'll be assuming the left channel in this discussion.)

1-99Common parts (power supply, etc.) Also tube designations.
100-199Left phono preamp
200-299Right phono preamp


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