C H A P T E R 3
Operating the Amplifier
Powering your system on
After you have properly connected your loudspeakers to your power amplifiers and all your source
components and the power amplifiers to the preamplifier you are ready to power your system on.
1. If you haven’t already done so, visually (by looking through the cage vent holes) ensure that all the tubes
inside the VTL amplifier are properly seated all the way into their sockets. Make sure that the power
amplifier is not powered on at this stage by either disconnecting it from the AC source or turn the power
on switch on the front panel of the amplifier to the “off” or “0” position.
2. Power on the source component(s) you intend to use for your listening session
3. Power on your preamplifier. Make sure that your preamplifier is either in the mute state or turn its volume
knob to the zero position.
4. Using the power cord which comes with your amplifier, connect the one end of the power cord to the
“AC POWER” connector on the bottom angle of the back of the amplifier. Connect the other end of the
power cord to an electrical outlet directly into a wall socket.
5. Turn on the power amplifier in your system one monoblock at a time so as not to trip a circuit breaker or
blow a fuse. The power-on switch is located on the right hand corner of the amplifier’s front panel. When
the unit is powered off, the switch points in the “0” position. Clicking the switch once turns on the unit
and the switch is in the “1”. There is a green power-on LED to the left of the front panel. The LED light
should be on when the system is properly powered on.
1. Repeat the above step for the other power amplifier in your system.
Do not turn on both amplifiers at
the same time. This might cause the circuit breaker in your house to trip or blow a fuse in your
fuse box.
Caution: When you turn on your amplifier for the first time, watch the tubes while they warm up
and observe if any of them goes into an exceptionally bright red glow on the plate of any of the
tubes. Turn the system off immediately and refer to your authorized VTL dealer or the VTL factory
service dept. if this happens. This glow may indicate a defective tube which needs to be
replaced.
Caution: If powering on the system using the above steps results in tripping a circuit breaker in
your house, or blowing a fuse on the amplifier, then turn off the power amplifier and the rest of the
system immediately. Find the fuse box and turn the circuit on again to restore power to your
house. Contact your VTL authorized dealer or the VTL factory customer support department
immediately so that they can help you resolve this problem.
MB-125 Owner’s Manual
VTL
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