FRONT PANEL CONTROLS (Left to Right)
BOOST SWITCH: Increases the amount of output up to 20 dBV, depending on the setting of
the "Boost" control preset. The switch is overridden when a footswitch line is connected to the
"Boost" jack on the rear panel. Very useful when you want to switch between a rhythm crunch
and a lead gain level.
BYPASS SWITCH: Switches the unit in and out of the effects chain. The Red LED is when the
unit is active in the chain. This switch is overridden when a footswitch line is connected to the
"Bypass" jack on the rear panel.
INPUT JACK: Accepts normal inputs from instrument to line levels.
DRIVE CONTROL: Sets the amount of signal drive to the first stage of the tube. Increasing the
setting of this control results in more sensitivity and sustain of the tube overdrive section. This
is the most important control. You should experiment with setting it and your instrument's out-
put level to a combined setting to give you the desired amount of crunch and sustain.
BOOST CONTROL: A preset output level boost, this control works in conjunction with the
"Boost" front panel switch or "Boost" footswitch jack. This control adds as much as 20 dBV to
any "Master" volume setting, giving you the ability to switch in a volume boost for leads when-
ever you want. This control is particularly useful it you happen to be using an all-tube amp or
an amp with a built-in distortion sound you like. Try experimenting with your amp using the fol-
lowing steps:
(a) With the TUBE DRIVER in bypass, set your amp at just the point of break-up with its
internal distortion.
(b) Switch in the TUBE DRIVER, without the "Boost" switched on, and adjust for a good
overdrive sound.
(c) Adjust the "Master" volume on the TUBE DRIVER to equal the level of the bypassed
signal. This becomes your rhythm distortion.
(d) Switch in the "Boost", and adjust the overall volume to your liking for your lead sound.
Now your amp is being overdriven in addition to the TUBE DRIVER's internal tube distor-
tion generator.
MASTER CONTROL: Sets the overall output level of the rack.
HI CONTROL: Adjusts high end. Set at 1500 Hz and higher.
MID CONTROL: Adjusts mid-range frequencies. Center is 500-800 Hz.
LOW CONTROL: Shelves off lower frequencies from 1 00 Hz down.
POWER SWITCH: Supplies main AC power to the unit. The Green LED is lit when the power
is on.
