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1) Footswitch Assignment—This button selects which of the amp’s effects are
controlled by the “Effects” button on the footswitch. If the switch is IN, the foot-
switch will control the Reverb and the Tremolo will only be controlled by the Pull
Active Switch on the Speed control. If the Footswitch Assignment button is OUT,
then the Reverb will be active always, and the footswitch will remotely control
the Tremolo/Vibrato, overriding the setting of the Pull Active Switch on the Speed
control.
2) Footswitch—The Footswitch jack on the V100 is a stereo jack that connects the
V100 footswitch to the amplier. It uses a special circuit to decode the 3 switches
through a simple stereo cable. In an emergency, a mono instrument cable can be
used to allow footswitching of the channels only. In this setup, the LEDs will not be
visible, but at least the footswitch will select Rhythm or Lead channels.
3) Ground Lift—The Ground Lift switch disconnects pin 1 of the XLR Direct Out
jack to eliminate a “ground loop” hum. A ground loop can exist when the V100 and
the mixer it is plugged into are connected to grounded outlets that are in physically
different locations and/or on different circuits, and should only be used if there is an
audible hum. Pressing the ground lift does not disconnect the ground connection
from the V100’s chassis.
4) Direct Out—The XLR Direct Out jack is designed to connect the V100 ampli-
er to a recording or live mixer. The output is speaker-emulated, and mimics the
sound of the Celestion Vintage 30 loudspeaker. This output is very useful for direct
recording, and especially helpful for live applications since it eliminates a live mi-
crophone on stage and the resulting feedback potential. The V100 amplier should
never be operated without a speaker plugged into a speaker jack.
5) Direct Volume—Sets the level of the speaker-emulated direct out. This control
should be set as high as possible for the best signal-to-noise ratio.
6) Boost Volume—The Boost Volume knob controls the amount of footswitchable
boost, and is particularly useful for solos. It will provide up to 10dB of “Master
Volume” boost, and boosts both channels. The tone is optimized to increase the
volume without sacricing too much headroom in the power amp, so the resulting
solo cuts through. The boost is active if the footswitch is unplugged.
7) Effects Return—This 1⁄4” jack breaks the ow of amplier signal to allow an
external effects device to “return” to the amp. The Return jack can also be used
for a power amp input, when using an external preamp. This all-tube effects loop
is known as a “series” loop, since it breaks the path of the amplier and “inserts”
the effect in series.
8) Effects Send—This 1⁄4” jack delivers a tube-driven preamp signal to exter-
nal effects devices. It can be used to send the signal to another amplier to run
multiple amps. Connecting a 1⁄4” plug does NOT break the ow of the amplier
signal. To connect two Defender ampliers in stereo, a stereo effects device can
be driven from one Defender amp’s Send, and the device’s two stereo outputs can
be returned to both Defender amp Returns.
V100 Back Panel
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