The DOD Overdrive Preamp 250-X is an overdrive pedal from DOD, released on September 25, 2025 as the tenth generation of the long-running DOD 250 overdrive1. It keeps the two-knob format of the original, Gain and Level, but adds a three-position toggle that selects between three clipping modes: Silicon, Lift and Asym2. DigiTech describes it as combining three characters in one compact pedal without losing the DNA of the original, and it is a regular production model rather than a limited edition1.
The circuit continues to rely on the classic LM741 op-amp, which Gearnews notes significantly influenced the sound of the old models3. It is built in a robust aluminum housing and fully assembled in Indonesia23.
Three clipping modes: Silicon, Lift and Asym
The toggle switch selects from three different overdrive effects, each changing how the signal is clipped1.
| Mode | What it does |
|---|---|
| SILICON | Symmetrical clipping for the classic 250 sound2 |
| LIFT | Removes diode clipping for a clean boost at moderate settings or a dirty boost at higher levels, pushing the vintage-style LM741 op amp2 |
| ASYM | Asymmetrical clipping for rich, even-harmonic distortion2 |
Silicon mode is the traditional voice: Gearnews describes it as symmetrical silicon clipping producing a classic vintage sound3. Asym mode engages a rich, even-harmonic overdrive through its asymmetrical clipping circuit, and Guitar World notes this mode was changed from germanium to silicon diodes compared with earlier versions14. Lift mode is the most flexible of the three: with the diodes out of the circuit, the pedal works as a clean boost at lower Gain settings or a dirty boost when the op amp itself is pushed harder2.
The controls
The control layout stays close to the original 250: Gain for preamp drive and Level for output volume4.
| Control | What it does |
|---|---|
| Gain | Controls the amount of overdrive, from subtle grit to full distortion2 |
| Level | Match to your amp's volume, or crank it up to boost leads and solos2 |
| Toggle switch | Selects from three different overdrive effects1 |
Power: 9V, 12V or 18V
The 250-X runs on a 9V center-negative supply or a 9V battery, drawing 7mA4. It can also operate at 12V or 18V, which DOD says allows for more headroom as the voltage increases1. For a player wanting a cleaner, louder boost out of Lift mode, the higher voltage options give the op amp more room before it breaks up.
The 12V and 18V options require a suitable power supply. The battery option only applies at 9V.
History: the tenth version of the DOD 250
The original DOD 250 Overdrive Preamp came out in 1974, shortly after the MXR Distortion+4. Guitar World's Alex Lynham calls the original a near-clone of the Distortion+, with the key differences being component value changes and a switch to silicon diodes for the distortion block4. The 250-X is the 10th generation of the 250 overdrive, announced by DigiTech in September 20251.
DigiTech says the 250-X shares similarities with its counterpart, the DOD 250 50th Anniversary pedal, but the 250-X is not a limited edition1. Where the 50th Anniversary marks the anniversary of the original, the 250-X is the ongoing production version of the circuit.
What reviewers said
Guitar World's review found the 250-X to be a meaningful update to a fifty-year-old design, with clear limits4:
"All in all, the DOD 250-X is a big improvement over the stock 250. However, it is a fifty-year-old pedal, and this shows"4
Guitar World's reviewer found it less versatile than later pedals, but useful for stacking with other drives and fuzzes4. Gearnews summed up the appeal of the three-mode format:
"Thus, the 250-X combines three characters in one compact pedal without losing the DNA of the original3."
Gearnews, September 20253
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Elmo Karjalainen
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Questions
Is the DOD 250-X true bypass?
Yes. DigiTech's announcement for the 250-X confirms it uses true bypass switching, so the pedal's circuit is out of the signal path entirely when disengaged. That is a change from some earlier 250 versions, which used other bypass arrangements.
Does the DOD 250-X take a 9V battery?
Yes. Alongside its 9V center-negative DC input, the 250-X runs on a 9V battery, drawing about 7mA. It also accepts 12V or 18V from a suitable supply, which DOD says increases headroom as the voltage goes up.
Is the DOD 250 a clone of the MXR Distortion+?
Guitar World describes the original 1974 DOD 250 as a near-clone of the MXR Distortion+, which came out shortly before it. The key differences were component value changes and a switch to silicon diodes in the distortion block, so the two circuits are related but not identical.
What is the difference between the 250-X and the 250 50th Anniversary?
DigiTech says the 250-X shares similarities with its counterpart, the DOD 250 50th Anniversary pedal, including the same three clipping modes. The main practical difference is availability: the 50th Anniversary is a limited edition, while the 250-X is a regular production pedal.
Where is the DOD 250-X made?
DOD's product page lists the 250-X as fully assembled in Indonesia. It comes in a robust aluminum housing, which Gearnews notes provides stability on stage.
Does the 250-X still use germanium diodes?
No. Guitar World reports that the asymmetric clipping mode was changed from germanium to silicon diodes for the 250-X. The Silicon mode uses symmetrical clipping, and the Asym mode uses asymmetric silicon clipping for even-harmonic distortion.
Sources (4)
- NEW Product Spotlight: Overdrive Preamp 250-X, DigiTech, 2025-09-25
- Overdrive Preamp 250-X, DigiTech, 2026-01-02
- DOD Overdrive Preamp 250-X: The 10th Generation of a Legend, gearnews.com, 2025-09-26
- DOD Overdrive Preamp 250-X review, Guitar World, 2025-12-16
