SVT-VR Bass Guitar Amplifier
7
The Rear Panel
17. IEC POWER INPUT CONNECTOR: This
is where you connect the supplied AC
power cord. Plug the male end of the
cord into a grounded AC outlet.
DO NOT DEFEAT THE GROUND PRONG
OF THE AC PLUG!
18. FUSE: This protects the unit from
damage due to overload conditions or
power line surges. If the fuse blows,
replace it only with the same size and
type.
19. POLARITY: Place this switch in the
position that provides the least electrical
buzz from the unit.
20. BIAS / BALANCE SECTION: These
controls and sets of LEDs allow the user
to properly bias the power amp. See
“Setting Tube Bias and Balance” on page
15 for a complete description of how to
use this section.
21. SLAVE OUT: The slave out is for
slaving two amps together: it connects
both their power amps and their
preamps.
22. POWER AMP IN: This jack connects
directly to the internal power amp for
use with an external preamp. When
using an external source, connect the
OUTPUT of the source to this jack using
a shielded instrument cable to feed the
signal into the power amp section. The
internal signal is disconnected when a
plug is inserted into this jack.
23. PREAMP OUT: This jack is a direct
post master preamp output for use with
an external power amp. Connect the
external amp’s input to this jack using a
shielded instrument cable.
24. TRANSFORMER BAL OUT: This signal
may be used to feed an external power
amplifier, mixing console or house PA
system.
The signal level at this jack is controlled
by the level control [25] and may be
pre– or post–EQ depending on the
setting of the pre/post switch [26].
Additionally, the lift/gnd switch [27] is
available to reduce any noise that may
occur at the transformer bal out.
25. LEVEL: Use this control to adjust
the signal level at the transformer
bal out jack [24]. This control works
independently from the front panel
volume controls [3, 10].
26. PRE (CH. 1) / POST: The signal at
the transformer bal out jack [24] can
be set to either Pre-EQ or Post-EQ with
this switch. With the switch in the OUT
position, the signal at the jacks is
Pre-EQ. This is a direct output not
affected by any volume or tone
controls. With the switch in the IN
position, the signal is Post-EQ and is
controlled and modified by the volume
and tone controls.
27. LIFT / GND: When this switch is
engaged, it connects the ground
connection at the transformer bal
out jack [24]. This may help reduce
residual hum and buzz sometimes
picked up in line out signal cables.
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