Maxon OSD-9 Overdrive Soft Distortion Effect

Maxon OSD-9 Overdrive Soft Distortion Effect

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Made in Japan

The OSD-9 signal path starts with a 2SK246 jFET buffer which provides high input impedance and low output impedance into the 1st Op Amp – a UA741CP. The UA741CP is a vintage style 741 single Op Amp with superior resistance to latching up (distorting in a non-musical way) – it is not as ”precise” as modern IC’s, giving it a more vintage, warmer, “analog-ish” response. This 1st Op Amp is set up to provide a 20 to 120x gain in signal.

After the 1st Op Amp we have a pair of diodes to ground, just like classic boxes such as the MXR Distortion+, Pro Co Rat and Boss DS-1. From here it’s into another UA741CP with an amplification factor of 10 to boost the signal back to a high enough level to drive the input of an amplifier if necessary – a feature that the Distortion+ and DS-1 do not offer.

From here the signal is routed to a 4558 Op Amp unity gain amplifier, a volume control voltage divider, and then another unity gain 4558 to provide a low impedance output.

The OSD-9 uses a NJM2374A Voltage converter to stabilize the operating voltage at 9 VDC regardless of the voltage level coming off the battery, providing a smoother, more consistent operation and tonality.

The OSD-9 features Mechanical True Bypass switching via a Fujisoku 4PDT switch – the input of circuit is switched to ground when bypassed.

NOTE ON POWERING THE OSD-9 – this pedal’s voltage regulator IC requires a high inrush current of approximately 2000 mA upon startup. When using with a Power Brick such as the Voodoo Labs Pedal Power 2+, this pedal should be connected to a high current power jack when possible.

If it is not possible to connect to a high current jack, you can power the OSD-9 by leaving a battery in the pedal. Upon initial start-up, unplug the external DC power input cable, engage the pedal, and then plug the DC power input cable back in – the pedal will now power up normally off the external power supply until you power down your pedalboard.

Input Impedance: 500K Ohms
Output Impedance: 10K Ohms or less
Maximum Gain: 41.5dB (700Hz)
Equivalent Input Noise: -107dB or less (IHF-A)
Control: DRIVE, LEVEL
Operating Voltage: 9V
Power Consumption: 14mA/DC 9V, 14mA/DC 10V
Dimensions: 74 (W) x 124 (D) x 54 (H) mm
Weight: 580g (including battery)
Battery: 9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor
Battery life: Manganese dry battery 17 hours 25deg C / 77deg F (Panasonic 6F22NB)
Alkaline dry battery 34 hours 25deg C / 77deg F (Panasonic 6LR61G)
Option: Maxon AC adaptor (Maxon AC210N for North America)* All specifications are subject to change
for improvement without notice or obligation.

• Reissue of Maxon’s first Overdrive – OD880 – circa 1977
• Low gain, natural overdrive like a tube amp
• Works great as an amp booster
• Stack with other OD’s for increased tonal options
• NOS UA741 Op Amps for authentic vintage tone
• Regulated 9 VDC power
• True Bypass Switching