Overdrive and Output Level controls adjust the intensity of overdrive and output volume, while the Hi Boost/Hi Cut Tone control adjusts the brightness from warm and smooth to sizzling hot. From subtle boosts to outrageous roars, the Maxon OD-9 provides the artist with the widest range of usable, distinctly tube sounds available.
The Maxon OD-9 uses a signal-distorting diode (Panasonic #MA150) that is located in the amplifier stage’s negative feedback loop (this stage also contains the JRC4558 IC chip). Therefore, the OD-9 distorts signal in the amplifier section itself which yields a smoother, milder, more natural sounding distortion than a separate clipping stage. This is also the reason that the IC type used in the circuit has such a large impact on the unit’s tone. Maxon developed this unique design more than 20 years ago, an industry first that is commonplace today.
The OD-9’s new circuit uses different output resistors than its predecessor. After the unit’s initial release it was discovered to have a high susceptibility to noise due to static electricity buildup. To improve performance, the values of the output resistors on the Maxon OD-9 were increased, but their positions kept the same as the original. This circuit change has no audible affect on the sound of the unit, save for reducing unwanted noise levels. In addition, the Maxon OD-9 features True Bypass Switching for natural, uncompromised tone in bypass.
Like the OD808, the OD-9 provides the natural, mild overdrive of a tube amp without sacrificing the guitar’s original tone. It can also be used as a clean booster to provide increased gain from an amplifier.