OD-9 Overdrive

The Maxon OD-9 Overdrive is a highly regarded pedal known for its classic tonality and tube-driven tone. Here are the technical specifications and features:

- Input Impedance: 500K Ohms
- Output Impedance: 10K Ohms or less
- Maximum Gain: 48.5 dB (1.6 KHz)
- Equivalent Input Noise: -106.8 dB or less (IHF-A)
- Controls: TUBE, DRIVE, TONE, LEVEL
- Switch: BYPASS/EFFECT (mechanical TBS)
- In/Out: INPUT, OUTPUT
- Indicator: BYPASS/EFFECT LED
- Internal Circuit Voltage: 30 VDC (DC-DC Converter)
- Current Consumption: 260 mA / 9 VDC
- Dimensions: 74 mm (W) x 124 mm (D) x 54 mm (H) / 2.9” (W) x 4.9” (D) x 2.13” (H)
- Weight: 560 g (excluding AC adaptor) / 19.75 Oz.
- Power Supply: Maxon AC2009 (no battery operation)

The OD-9 features a mil-spec 5703WB JAN Raytheon sub-miniature vacuum tube with a separate Gain control (Tube knob) at the front of the audio path, driving the OD-9 circuit. The tube stage adds warmth, dimension, and saturation to the tone, providing a big, FAT, natural-sounding bottom end and characteristic tube "sag."

The pedal also incorporates internal voltage doublers to stabilize tone with low distortion and increased headroom. Additionally, it includes Maxon’s In- Rush Current Control system to extend tube life and Mechanical True Bypass switching via a Fujisoku 4PDT switch.

The OD-9 is a true-to-spec reissue of the legendary 1980’s OD-9/TS-9 circuit, with the addition of true bypass switching for clean, uncolored tone when bypassed.