Pro Tube IX
23
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 GROUND LIFT to eliminate the
current hum.
DI PRE/POST
switches the signal lying at the DI
OUT sockets.
PRE
the unmodified bass signal is retained on
both DI OUT sockets,
POST the tone control and effects loops are
inserted into the signal path in stereo.
REAR PANEL
1.
INPUT
socket to plug in a bass guitar.
2.
GAIN
c 3 LEDs to adjust the input
level:
CLIP
too high,
OK
optimum,
LOW
too low.
3.
CH. SELECT
+ 2-colored LED to switch from
channel 1 (red) to channel 2 (green).
4.
LIMITER
2-colored LED to
compress the signal (channel 2 only):
green Limiter on,
red
the signal level is actually
bein reduced.
5. For features of
CHANNEL 1
, please refer to
the chapter CHANNEL 1-TUBE.
6. For features of
CHANNEL 2
, please refer to
the chapter CHANNEL 2-SOLID STATE.
7.
OUTPUT
control for each c
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).
8.
EFF. MIX
controls determine the degree to
which the effects within the parallel stereo loop
(rear panel) affect the signal of each channel.
9.
PHONES
socket for connecting a headphone
(min 200
Ω
).
10.
MUTE
red LED cuts the signal from
all outputs, except from the
PHONES
socket,
and activates the
TUNER
output (rear panel).
11.
MASTER
control determines the mains level.
12.
POWER
switch for turning the amplifier on
and off.
FRONT PANEL CONTROLS
