Ground Loop Hum - VTL TL6.5 Owner's Manual

5. Check to ensure that the inputs are correctly configured for the preferred mode of
connection for each of the sources in either balanced or single-ended mode. Inputs 1
to 3 are set to balanced by default. If you wish to set the selected input to single-
ended, hold down the button for that input for three seconds. The LED for this input
will now change from blue to green to indicate that the input has been changed to
single-ended. Note that only the first three inputs can be configured for either
balanced or single ended use, and all others are single ended only.
6. Press the Input Selector to the input source you would like to use.
7. If not connected to the triggers, turn on the power amplifier(s) in your system.
8. Set the source component to play mode.
9. Turn the volume control up to the desired playing level, by either turning the Volume
Control knob clockwise or the volume up button on the remote control. If the
preamplifier is in mute, (i.e. the Mute LED is flashing), either push the mute button to
reset the system out of mute and into operating mode, or raise the volume control,
either via the front panel knob or the remote control, to release the mute.
A slight clicking noise may be heard through the speakers as the volume
control is rotated, with a 3 step clicking noise sometimes heard between
volume steps 19 - 20, 38 - 39, 57 - 58 and 76 – 77. This clicking noise is a
normal function of the relay steps used for the volume control, and has no
effect on sonic performance. The clicking noise may be louder while music is
playing, due to the stepped nature of the volume control. This louder clicking
sound is also normal and has no effect on sonic performance, nor will it cause
any damage to your system.
10. The LEDs on the unit's front panel indicate the operating mode of the preamplifier.
For more details on the different operating modes indicated by the LEDs, please refer
to the section below on "Operating modes and LED Indications":

Ground Loop Hum

If you get a ground loop hum from your stereo system after installation and power up
you should immediately turn off the TL 6.5 and consult your VTL dealer or the VTL
factory.
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
TL6.5 Preamplifier Owner's Manual
VTL
Caution: 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
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