VAC Phi 220 User Manual
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6
INSTALLATION
01)
Attach the cord from the power supply to the amplifier and screw the connector collar
down fully; this takes many turns.
02)
Connect the speaker cables; the black lead goes to “-“ or “Ground”. The red lead goes to
“+” or “Positive”. The speaker impedance selector switch should be set to match your
loudspeakers.
03)
Set the input type switch to XLR (and RCA isolated) or RCA direct. Note: the RCA-isolated
setting often produces less noise and better sound than the RCA-direct input by quelling
hum and/or buzz due to system ground loops.
04)
For traditional stand alone operation, set the 12 volt trigger switch
to “manual”. To use a 12 volt trigger to control power on/power
off, set the switch to “automatic”. Also select “automatic” when
connecting to the iVAC data buss of the Phi 2.0 Master Control
Preamplifier.
05)
Provide adequate ventilation - allow at least 3 inches above and to each side.
06)
Do not place in a completely enclosed cabinet. Do not stack other equipment on top of
the VAC unit.
07)
Do not operate on carpet or any other surface that might block air flow.
08)
The chassis and glass will become hot in normal use.
09)
Do not allow the chassis to touch any metal parts, such as the frame of an equipment rack.
This might create a parallel ground path that could degrade the sound of your system.
10)
Connect the power supply to the power source indicated on the voltage selector card
(visible by the main fuse), either 100, 120, 220, or 240 volts AC. The voltage may be select
by means of the removable selector card located behind the fuse in the power connectors.
Remove the cards and reinstall so that the desired voltage may be read; be certain to
change the fuse to the correct value.
11)
Avoid power conditioners that float the ground pin.
12)
Power requirements are approximately 500 watts per channel. Pay close attention to power
quality, and be aware that different power cords can alter the sound.
13)
Check the bias settings of the output tubes when the unit is first installed
and whenever
a tube is changed. It is also a good idea to verify the settings periodically, such as once a
week.