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not operate, and ST9Pro+ operates with battery or AC adaptor directly. There is no power
consumption for DC to DC converter, which makes battery life last longer.
●ST9Pro+ has increased dynamic headroom with internal operating voltage set at 18V. Stable
high-quality sound is available as unintentionally-generated distortion is significantly reduced.
●TBS (True Bypass Switching) using 4PDT mechanical switch lets your instrument's signal
pass through a non-electronic bypass line when the effect is disengaged, feeding your amplifier
with direct, unaltered signal from your instrument. No tone changes when the effect is engaged
as signal does not pass through electronic switching circuitry. This TBS gains enormous
popularity among artists.
●Easy-access, tool-free battery compartment.
⑦MODE SWITCH
The lower switch position, labeled “CLASSIC” se-
lects the original ST9's diode clip circuitry. The up-
per switch position, labeled “LOW BOOST” selects
an alternate paired-diode clip circuitry and low-end
boost circuitry. This alternate paired-diode clip cir-
cuitry adds more distortion in entire frequency
range. The low-end boost circuitry provides boost
by approx. 10dB around 100Hz.
⑧FOOTSWITCH
Switch for effect/bypass. Stepping on this switch
alternately turns effects on and off.
* Effect turns on when you depress the switch and
effect turns off when you depress and release the
switch.
⑨BYPASS/EFFECT INDICATOR
This indicates the effect/bypass status and battery
condition. At battery operation, it lights when plug
is inserted into input jack and effect is on. At the
external power supply (AC adaptor) operation, it
lights when effect is on. No LED light indicates the
battery is low or not installed. In this case replace
the battery.
⑩9V INDICATOR
This indicates the operating voltage status. It
lights when 9V is selected.
⑪18V INDICATOR
This indicates the operating voltage status. It lights
when 18V is selected.
⑫DC INPUT (power input jack)
Jack for connection of external power supply to
effect. Be sure to use the correct Maxon AC
adaptor.
* Turn down amplifier's volume to the min-
imum before connecting AC adaptor or
DC plug to the product in order not to damage
other connected equipment.
⑬OPERATING VOLTAGE SWITCH
Slide it to right side for 9V and left side for 18V.
* Turn down amplifier's volume to the min-
imum before switching.
ENGLISH
ST9Pro+
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