18
Pro Tube IV
FRONT PANEL CONTROLS
REAR PANEL
GROUND LIFT switch isolates the earth
connection from the ground of signal. Should
several devices be simultaneously connected to
earth by the same conductor as well as via line
connections, a so called hum loop might appear. In
this case operate the GROUND LIFT switch to
eliminate the current hum (when pressed).
DI PRE/POST switches the signal lying at the DI
OUT sockets.
PRE unmodified bass signal (it is retained on
both DI OUT sockets),
POST the tone control and effects loops are
inserted into the signal path in stereo.
DI OUT LEFT and DI OUT RIGHT sockets for
supplying a stage or studio mixing console.
TUNER OUT socket for the connection of a tuner.
When MUTE mode is activated,
the unmodified bass signal is retained here.
LINE OUT L + R sockets allow to connect
additional power amplifiers.
EFF. LOOP for the insertion of effects units.
Connect SEND with the input and RETURN L.
and RETURN R. with the outputs of the effects
device.
CHANNEL 1/2 FOOTSWITCH allows to
connect a footswitch for selecting between both
channels. To do so use a switch (latch) and not a
key (unlatch).
SPEAKER OUT sockets designed to supply
loudspeaker cabinets. One XLR and one Speakon
socket are provided. Both are connected in
parallel. The signal from the Speakon output is
leaded by 1+ and 1-.
INPUT socket to plug in a bass guitar.
GAIN control + 3 LEDs to adjust the input level:
CLIP too high,
OK optimum,
LOW too low.
LIMITER switch + 2-colored LED to compress
the signal (channel 2 only):
green Limiter on,
red the signal level is actually being
reduced.
For features of CHANNEL 1, please refer to the
chapter CHANNEL 1-TUBE.
For features of CHANNEL 2, please refer to the
chapter CHANNEL 2-SOLID STATE.
OUTPUT control for each channel + OL
(overload) LED to mutually balance both channel
levels. Should the OL LED light up, reduce
OUTPUT of the respective channel. The standard
setting, i.e. with neither attenuation nor
amplification, is position 8 (when tone controls are
set linearly).
CH. SELECT + two LEDs to switch from channel
1 (red) to channel 2 (green).
PHONES socket for connecting a headphone (min
200 Ω).
MUTE switch + red LED cuts the signal from all
outputs, except from the PHONES socket, and
activates the TUNER output (rear panel).
MASTER control determines the mains level.
POWER switch for turning the amplifier on and
off.
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