CHAPTER 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. 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 down turns on the unit and the switch is in the “1” position. There is a power-on LED to the
left of the front panel. The LED light should be on when the system is properly powered on.
ÎCaution: 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 that needs to be replaced.
ÎCaution: 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.
Ground Loop Hum
If you get a ground loop hum from your stereo system after installation and turn on, you should immediately
turn off the amplifiers and consult your VTL dealer or the VTL factory. Under no circumstances should you
attempt to lift or defeat any grounds on electrical equipment plugged into the AC, as these grounds are installed
for your and the equipment’s safety, and an ungrounded component can present an extremely hazardous
condition and is illegal under most electrical safety codes. For your own safety please refer all questions of this
nature to a properly trained service technician.
ST-150 Owner’s Manual
VTL
7
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