VAC Phi 2.0 Master Control Preamplifier - Manual (Page 9)

8
OPERATION
Turn the "Volume" control fully counterclockwise.
Mute is automatically engaged when switching on the unit.
Allow the preamplifier to warm up for a minute before you un-mute the unit; failure to wait
can cause a transient to be sent through your power amplifier that might cause damage to
your loudspeakers.
As with all high fidelity products, the sound characteristic of the VAC changes somewhat as
it warms up. Best sound will be achieved after about 15 minutes of operation.
Any time that the Phi Preamplifier has not been used for a few weeks the sound may be
different. This is also normal for high resolution audio equipment. Optimum sound should
return after a few hours of operation, preferably with an audio signal.
Note that although your VAC System has been run for 48 hours at the factory, it will continue
to "break in" for approximately 150 hours. Also be aware that many components display the
need for a new break in period after being transported in unheated cargo aircraft.
FUSES
Please note that there are two fuses on the power supply.
One is located behind the clear plastic window of the power connector. For 220 or 240
volt operation, please use a 2.0 ampere fuse. For 100 or 120 volt operation, the fuse should
be 4.0 amperes.
The other is in a conventional fuse holder. It should be a 0.3 ampere fuse.
If the unit is converted for operation at a voltage other than 220 volt, the fuse values must
be changed. Please consult the factory for more information.
See the INSTALLATION section for information on changing the operating voltage.