LOUD TECHNOLOGIES, INC.
5
The Rear Panel
17. AC LINE IN: Firmly insert the supplied AC power cord into this socket
until it is fully seated. This grounded power cord is to be plugged into a
grounded power outlet, wired to current electric codes and compatible with
voltage, power, and frequency requirements stated on the rear panel. Do
not attempt to defeat the safety ground connection.
18. (FUSE): The fuse helps protect the unit from damage due to overload
conditions. If the fuse fails, replace it only with the same size and type. If
the fuse fails repeatedly, check the line voltage or contact an Ampeg
Service Center.
19. POLARITY SWITCH: Use this switch to select the AC line voltage
polarity which yields the least electrical noise from the amplifier.
20. BIAS CONTROLS / BALANCE: Use these controls and their LEDs to
properly bias and balance the power amp. Refer to “Setting Tube Bias and
Balance” on page 7 for complete details.
21.SLAVE OUT: Use this jack to send a preamp output signal to an auxil-
iary power amplifier. The signal at this jack is post-EQ.
22. POWER AMP IN: This jack connects an external preamp directly to
the power amp. When using an external source, connect its output to this
jack by means of a shielded signal cable to feed the signal into the power
amp section. The internal preamp is disconnected when a plug is inserted
into this jack.
23. PREAMP OUT: Use this jack to send a signal from the internal preamp
to an auxiliary power amplifier, mixing console, monitor system, or house
PA system. The signal at this jack is post-EQ.
24. LEVEL: Use this control to adjust the signal level at the Transformer
Bal. Out jack (#27). This control works independently from the front panel
Volume controls (#3,10).
25. PRE (CH 1)/POST: This switch, when depressed, sends a Post-EQ
signal from Channel One to the Transformer Bal. Out jack (#27). The Post-
EQ signal is modified by the settings of the tone controls. With the switch
in the out position, the Channel One signal sent to the Transformer Bal.
Out jack is Pre-EQ. The Pre-EQ signal is a direct output and is not affect-
ed by any of the preamp settings.
30. LIFT/GND: This switch, when depressed, connects the ground con-
nection at the Transformer Bal. Out jack (#27). This may help reduce resid-
ual hum and buzz sometimes picked up in line out signal cables.
27. TRANSFORMER BAL. OUT: Use this XLR jack to send a balanced
line level signal to a house mixing board, recording console, or external
amplifier. The signal level at this jack is controlled by the Level control (#24)
and may be Pre or Post-EQ depending on the setting of the Pre/Post
switch (#25).
28. IMPEDANCE SELECTOR: Use this switch to match the output imped-
ance of the amplifier to the overall impedance rating of your cabinet(s). The
following chart shows total impedance for speaker cabinets used in parallel.
29. SPEAKER OUTPUTS: Use these jacks to connect the amplifier to
your speaker cabinet(s). The 1/4” jacks offer a convenient method of con-
necting to speaker cabinets using cables terminated with 1/4” plugs.
However, when using the amplifier at or near its full output power, using the
Speakon
®
jacks is recommended. (Pin 1+ = hot, pin 1- = return.)
SVT-VR Bass Amplifier
Cabinet Number of Total
Impedance
Cabinets Impedance
2 ohms 1 2 ohms
4 ohms 1 4 ohms
4 ohms 2 2 ohms
8 ohms 2 4 ohms
8 ohms 4 2 ohms
(12 pages)
(8 pages)
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