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Maxon ST9Pro+

The legendary MAXON ST9 overdrive pedal, now featuring a new circuit!

■Features

●The legendary MAXON ST9 overdrive pedal, released in the 1980s, is still talked about today as a vintage effect pedal even though it is no longer in production. The ST9Pro+ (Super Tube) is a rebirth of the original ST9, equipped with a new circuit.

●The mid-range boost control reproduces a powerful, rich sound reminiscent of stacking tube amplifiers.

Additionally, the drive control allows for a wide range of settings, from booster-style configurations to tones ranging from blues to hard rock.

●Equipped with a new dual-pair diode clip and low-end boost circuit, you can now select even more powerful distortion and a pronounced low-end boost.

● You can choose between 9V and stabilized 18V for the internal operating voltage.

The new circuit uses an internal DC/DC converter to step up the voltage to 18V only when 18V is selected.

When 9V is selected, the internal DC/DC converter does not operate at all, and the unit runs on the voltage supplied directly from a battery or AC adapter.

When using batteries, the internal DC/DC converter does not operate, which improves battery life.

● By setting the internal operating voltage to 18V, sufficient dynamic headroom is ensured, unintentional distortion is significantly reduced, and a consistently stable, high-quality sound is achieved.

● True Bypass Switching (TBS) is implemented using a 4PDT mechanical switch.

When in bypass mode, the signal passes through a complete bypass state without passing through any electronic circuitry.

Even when the effect is active, the signal does not pass through any electronic switching circuits, so there is no degradation in sound quality.

This TBS is highly favored by many musicians and guitarists.

Battery replacement is a one-touch process. It can be easily replaced without the need for a screwdriver or coin.

● Made in Japan

*Note* The TBO9 does not operate on batteries. It operates using the included AC adapter.

■Specifications

Input Impedance: 500kΩ

Output Impedance: 10kΩ or less

Maximum Gain: 51dB (2.2kHz)

Equivalent Input Noise: -115dB or less (Input Shorted, IHF-A)

Controls: MID ENHANCE, DRIVE, TONE, LEVEL

Switches: BYPASS / EFFECT / Voltage Switch (9V/18V) / MODE Switch (CLASSIC / LOW BOOST)

Internal Circuit Supply Voltage: 9VDC / 18VDC (DC/DC Converter)

Power Supply: One 6F22 9V dry cell battery or dedicated AC adapter

Current Consumption: 12mA / 9VDC, 36mA / 18VDC

Battery Life:

9VDC

Manganese: 26 hours at 25°C (Panasonic 6F22NB)

Alkaline: 48 hours at 25°C (Panasonic 6LR61G)

18VDC

Manganese: 2 hours at 25°C (Panasonic 6F22NB)

Alkaline: 8 hours at 25°C (Panasonic 6LR61G)

Dimensions: 74 (W) × 124 (D) × 54 (H) mm

Weight: 610 g (including battery)

Included Items: Test battery × 1, Product Warranty × 1, Instruction Manual × 1

Item Specifics

Product Name	Maxon ST9Pro+
Voltage	9VDC   18VDC
Condition	New
Shipping origin	Japan

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