VAC Phi Beta Preamplifier - Manual (Page 9)

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Phono: Selects between the MM and MC inputs. Overall phono function is selected
with the main Selector switch (phono is one click counterclockwise from “1”
or one click clockwise from “6”).
PH1 is the MC phono input. It has 64 dB of gain, making it suitable for most
low output cartridges.
PH2 is the MM input, which provides 44 dB of gain, suitable for use with MM
(moving magnet) and many high-output MC (moving coil) cartridges.
Optionally, PH2 may be a second MC input.
Both PH1 and PH2 may be connected in the same system, so that in essence
there are two phono inputs, selectable from the front panel.
Selector: This switch selects between IN1 through IN6 and the PHONO inputs. Rotate
counterclockwise to move down through the inputs, clockwise to move up
through the inputs.
Volume: Controls the output level for the PHONO input, and any line input set to the
“VAR” LEVEL mode. Note: it is possible that one or both channels may not
shut off completely in the fully counter-clockwise position, and that channel
balance may skew at whisper levels.
Meters: Indicate the operating voltages within the unit. This will vary somewhat due
to fluctuations in power line voltage.