Maxon VOP-9 Vintage Overdrive Pro Effect
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Made in Japan
The VOP circuit is basically a hot-rodded 808 with a few special tricks. After a JFET input buffer, the signal is sent a dual-gang Drive pot where it is split between a clean gain stage and the overdrive stage. As the Drive knob is turned up, more signal is sent to the overdrive stage while the drive of this stage is also turned up. If the Drive knob is turned down, more signal is sent to the clean gain stage and the drive of the overdrive stage is turned down. At 12 o’clock on the Drive knob, signal is split 50/50 clean/overdriven.
The VOP-9 features a standard 808-style tone control. However, the entire pedal is running at 18 volts via an internal voltage doubler that bumps up the clean headroom and provides greater output and a fuller frequency response than the typical 808 circuit – in other words, no midrange spike!
Even though the VOP circuit is running at 18 volts, it powers up off standard 9 VDC via battery or a standard external power adaptor.
The VOP-9 features Mechanical True Bypass switching via a Fujisoku 4PDT switch.
NOTE ON POWERING THE VOP-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.
Input Impedance: 500K Ohms
Output Impedance: 10K Ohms or less
Maximum Gain: 46dB 1.5kHz
Equivalent Input Noise: 112dB or less (IHF-A)
DRIVE, TONE, LEVEL
18V (+-9V) /9V (+-4.5V) switch
Operating Voltage: 18V (+-9V)/ 9V (+-4.5V)
30mA/9V, 28mA/10V at operating voltage 18V (+-9V)
23mA/9V, 24mA/10V at operating voltage 9V (+-4.5V)
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
Manganese dry battery +-9V 3.5 hours 25deg C / 77deg F (Panasonic 6F22NB)
Manganese dry battery +-4.5V 8 hours 25deg C / 77deg F (Panasonic 6F22NB)
Alkaline dry battery +-9V 10 hours 25deg C / 77deg F (Panasonic 6LR61G)
Alkaline dry battery +-4.5V 20 hours 25deg C / 77deg F (Panasonic 6LR61G)Option: Maxon AC adaptor (AC210N for North America)