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ST9Pro+ Super Tube
FEATURES AND CONTROLS
●ST9Pro+ was developed based on the legendary overdrive Maxon ST9, which was released in
the 80s and still well-known even after it was discontinued. ST9 was reborn as ST9Pro+ with
new circuitry.
●ST9Pro+ creates powerful, heavy, fat sound like a stack amp with midrange boost control.
Wide range of setting, such as a booster, blues and hard rock, is available.
●With newly added selectable diode clip circuitry and low-end boost circuitry, more powerful
distortion and low-end boost are available.
●Operating voltage (9V or 18V mode) is switchable via an internal slide switch accessible
through the unit's battery compartment. In new power-saving circuitry for ST9Pro+, DC to DC
converter only operates at 18V mode. When 9V mode is selected, DC to DC converter does
①IN (input jack)
Input jack to connect to the output of guitar, other effects or re-
lated equipment. The product automatically turns on when a
plug is inserted into this jack without external power supply (AC
adaptor) operation. When not in use, disconnect plug from in-
put jack to preserve battery life.
②OUT (output jack)
Output jack to connect to input of amplifier or other effects.
③DRIVE
Controls distortion. Turn it CW for more distortion.
④MID ENHANCE
Controls midrange boost frequency. When turning it CW, boost
part moves to high-tone range. When turning it CCW, boost
part moves to low-tone range.
⑤LEVEL
This controls output level of effected signal. Typically output
levels of both normal signal and effected signal should be ad-
justed to equal levels.
⑥TONE
Controls high-tone range. Turn it CW to accentuate high-tone
range. Turn it CCW to cut high-tone range.
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