least 10 inches away from your preamplifier to prevent possible noise introduction into your system. Tiptoes
or other isolation accessories may prove useful in reducing mechanical vibrations. Do not place amplifiers
directly on high pile carpets, as this will block the ventilation vents. Do not place the amplifier next to
heat sources such as radiators, stoves or other appliances. Do not place amplifier on the floor where small
children can tamper with the equipment. If it is not possible to place amplifier out of the reach of small
children it is recommended that you remove power cables when the equipment is not in use.
Servicing
Do not attempt to service the amplifier beyond the procedures described in this manual. For all other service
and questions, please contact your authorized VTL dealer or the factory.
Operational Warnings
Î Do not touch the tubes after the amplifier is turned on. Tubes can get very hot while the
amplifiers are operating. Turn off the amplifier and allow the tubes to cool down before attempting to work
with the tubes.
Î Do not attempt to disassemble the amplifier chassis or remove any covers from the amplifier.
Always consult with your VTL authorized dealer or the VTL factory support department before attempting
any service work on any VTL unit.
Î Always connect your loudspeaker to the amplifier before powering the unit on. Operating any VTL
power amplifiers without a speaker load connected can damage the output transformer, and will not be
covered under the warranty. Also, ensure that no speaker cables can become loose during use and that there
are no intermittent faults with the cables.
Î Tube amplifiers can be heavy and awkward to lift, with the weight unevenly distributed, and you
should not attempt to move the unit without help. Each unit of the ST-150 Stereo weighs approximately 58
lbs. (26.4 Kg).
Î Do not attempt to make or break any connections to the amplifier while the unit is powered on as
this can damage the amplifier and/or the rest of the system, and this damage is not covered by warranty.
Î If this unit has tetrode/triode switch, do not flip the triode tetrode switches while the unit is powered
on, as this can damage the switch and is not covered under warranty.
Î Do not exceed fuse ratings or attempt to bypass any fuses, as this can cause an extremely hazardous
condition and will void any warrantees. Use only the same type and rating of fuses as specified in the owner’s
manual and marked on the unit.
ST-150 Owner’s Manual
VTL
2
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