Front_Panel; Instrument_Input; Passive/Active_Switch; Tuner - Mesa/Boogie Big-Block 750 Owner's Manual

FrONT PANeL CONTrOLS:
INPUT:
This jack is the instrument INPUT which feeds the first tube in the all-tube preamp of the BIG BLOCK. It is set up with
enough headroom to handle both passive and active style instruments. For active instruments you may find yourself running the
S I M U L S T A T E TM B A S S A M P L I F I E R
INPUT

TUNER

OVERDRIVE

ACTIVE
MUTE
PASSIVE
PASSIVE_/_ACTIVE: S I M U L S T A T E TM B A S S A M P L I F I E R
This mini toggle switch controls the input headroom and impedance of the INPUT. As you might have
INPUT TUNER
guessed, the switch selects either the full strength PASSIVE input impedance circuit or a "padded" higher headroom ACTIVE cir-
OVERDRIVE
ACTIVE
MUTE
PASSIVE
TUNER:
This jack provides a convenient Front Panel output for connection of a TUNER. It is wired in parallel with the Rear Panel
TUNER output. There is an optimum padded signal present at all times on both Front and Rear jacks. There is a MUTE function and
S I M U L S T A T E TM B A S S A M P L I F I E R
INPUT TUNER
ACTIVE
PASSIVE MUTE
OVERDRIVE:
This control determines the amount of all-tube OVERDRIVE that can be blended with the regular "clean" preamp
signal. This circuit creates a whole new realm of sounds that range from a soft-clip purr, to fully saturated grind. The OVERDRIVE
S I M U L S T A T E TM B A S S A M P L I F I E R
INPUT TUNER
OVERDRIVE
ACTIVE
MUTE
PASSIVE
GAIN control somewhere between 10:00 and 2:00 for optimum headroom. If you do hear a soft
clip creeping in at higher settings, don't worry, this is the beauty of a tube front end. You may feel
free to drive the preamp for a more furry character when hyper-clean is just too clean.
NOTE: When driving the preamp with higher settings of the GAIN control it is wise to reduce the
BASS control and any low frequencies dialed up on the ACTIVE MID control. This will protect ac-
cidental damage to speakers and help avoid tubbiness or lack of tightness in the low end.
cuit. Standard passive basses that don't incorporate an onboard preamp should be used in the PASSIVE
setting, while more modern instruments that utilize active pickups and/or an onboard preamp should be
used in the ACTIVE setting.
LED indication, which is only controllable from the Footswitch. There is no mute function avail-
able when the Footswitch is disconnected.
OVERDRIVE
has been tailored specifically for bass applications and does not disturb the blend dialed up on
the tone controls.
The OVERDRIVE circuit is activated via the included Footswitch and the combination of the Front
Panel OVERDRIVE control (which determines the amount) and the O.D. MASTER (which gives
you control over the volume of the OVERDRIVE), means that this feature creates a channel
switching option that can be used for a wide range of choices.
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TUBE DRIVEN-MOSFET POWER
EFFECTS
RETURN SEND
OUTPUT
FOOT
VEL
TUNER
SWITCH
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