Here for sale we have a Maxon OD-9 Overdrive effect pedal. While the OD808 may have been the first overdrive circuit of its kind, it was the OD-9 that cemented this sound in the history of Rock & Roll guitar.
 
Here is what Maxon have to say about the OD-9;
 
“Looking at the OD-9’s circuit, you’ll realize that this is not some redesign being cleverly marketed as a reissue – this is THE original OD-9 (TS-9) circuit, yet with the addition of true bypass switching.  Even the PC board is the same one that Maxon’s been using for the past 30+ years, complete with empty slots where parts for the FET switching circuit have been left out!
Like the original, the current production OD-9 features the NJM (JRC) 4558D Op Amp – an essential component for authentic “TS” tone.
The NJM is smoother sounding and less compressed than other Op Amps, offering superior sound quality with low noise.
The absence of the FET switching circuit gives the OD-9 some added output and a slightly more open sound than the OD808, making it perfect for the classic rock tones that it helped to define.
If your future plans include a meteoric rise to rock & roll stardom, then rely on the legendary tones of the OD-9 to fuel your ascent.
 
Specifications
Maxon’s version of classic TS-9 Tube Screamer
More Drive and Output than OD808
NJM (JRC) 4558 Op Amp
True Bypass Switching
The tone that made Stevie Ray Vaughan famous
Input Impedance: 500K Ohms
Input Jack: 1/4 inch standard phone jack
Output Impedance: 10K Ohms or less
Output Jack: 1/4 inch standard phone jack
Outputs: 1
Equivalent Input Noise: -114 dB or less (input shorted IHF-A weighted)
Maximum Output Level: 0 dBm
Maximum Gain: +40 dB (at 1.5 KHz)
Controls: Drive, Tone, Level
Switch: Normal/Effect (true bypass configuration)
Power Supply: 9V Manganese dry cell battery (6F22) or special AC adaptor
Power Voltage: DC9 V (Battery) / DC10 V (AC-adaptor)”