MASTER VOLUME CONTROL
Controls the overall volume level of the amplifier.
RESONANCE CONTROL
Adjusts the low-frequency damping factor of the power amplifier, which gives the amp a "tighter" sound
when fully dialed counter clockwise and an increasingly "looser" sound when adjusted clockwise.
PRESENCE CONTROL
Adjusts the high frequency damping factor of the power amplifier, which gives the amp a "mellow" char-
acter when fully counter-clockwise and more of "biting" or forward character when rotated clockwise.
STANDBy SwITCH
This switch turns on the high-voltage supply on or off, with up being the ON position. The preamp and DI
will still function when this switch is off.
TIP: Always allow at least 5 minutes of warm-up time before switching the STANDBY switch on. This will
improve performance and reliability of the power tubes.
POwER SwITCH
Turns the unit on or off, with up being the ON position.
Caution: The on/off switch in this unit does not break both sides of the primary mains. Hazardous energy
can be present inside the chassis even when the on/off switch is in the OFF position.
IEC POwER OUTLET
Your AC mains cord plugs in here. The VB-3 has a proprietary universal switch mode power supply that ac-
cepts AC line voltages from 100 VAC to 240 VAC, at 50-60 Hz for correct operation in ANY country with the
proper IEC mains cord/plug.
U.S. DOMESTIC AC MAINS CORD
The mains cord supplied with the unit is a heavy-duty, three-conductor type with a conventional 120 VAC
plug with ground pin. It should be connected to an independent circuit capable of continuously supporting
at least 15 amps. This is particularly critical for sustained high-power applications. If the outlet used does
not have a ground pin, a suitable adapter should be used and the third wire grounded properly. All appara-
tus with class 1 construction shall be connected to a mains socket with a protective earthing connection.
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