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1) Footswitch—The Footswitch jack on the V50 is a stereo jack that con-
nects the V50 footswitch to the amplier. It uses a special circuit to decode
the three 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.
2) 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
V50 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 V50’s chassis.
3) Direct Out—The XLR Direct Out jack is designed to connect the V50 ampli-
er to a recording or live mixer. The output is speaker-emulated, and mim-
ics 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 microphone on stage and the resulting feedback potential.
The V50 amplier should never be operated without a speaker plugged into
a speaker jack.
4) 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.
5) Boost Volume—The Boost Volume knob controls the amount of footswit-
chable 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.
6) 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 ef-
fects loop is known as a “series” loop, since it breaks the path of the amplier
and “inserts” the effect in series.
7) Effects Send—This 1⁄4” jack delivers a tube-driven preamp signal to ex-
ternal 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 amps’ Returns.
V50 Back Panel
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