The Pettyjohn Electronics CoreX ODI is an overdrive pedal in the company's CoreX series. Pettyjohn describes it as based on Stephen Pettyjohn's first overdrive pedal, the famous 1979 OD-1, the circuit that started the overdrive category.1
What it does
Pettyjohn says the CoreX ODI includes "the essential JRC4558 and NOS Toshiba diodes and classic voicing with extended range and CoreX feature set." In plain terms, it follows the chip-and-diode recipe of the original OD-1 style circuit, then extends the range of that voicing with the features shared across the CoreX pedals.1
The CoreX ODI sits alongside the earlier ODI. Pettyjohn describes it as built around the essential JRC4558 and NOS Toshiba diodes, with classic voicing, extended range and the CoreX feature set.1
Pettyjohn states that the CoreX ODI includes the essential JRC4558 and NOS Toshiba diodes, and that its voicing is classic but with extended range and the CoreX feature set.1
Videos
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Questions
Is the Pettyjohn CoreX ODI still in production?
No. Pettyjohn Electronics discontinued the CoreX series as of October 2026. The company explained that the power supply the series is designed around is being discontinued, so the CoreX pedals are off the market until a suitable replacement is found.
What pedal is the CoreX ODI based on?
Pettyjohn describes the CoreX ODI as based on Stephen Pettyjohn's first overdrive pedal, the famous 1979 OD-1. The company's version uses the essential JRC4558 chip and NOS Toshiba diodes, with classic voicing extended by the CoreX feature set.
Sources (1)
- CoreX | Pettyjohn Elec, Pettyjohn Electronics
