Extreme Scream Machine Drill Template
PedalPCB · 125B
Template details
- Circuit
- Extreme Scream Machine
- Vendor
- PedalPCB
- Enclosure
- Hammond 125B
- Dimensions
- 63.6 × 119.3 × 35.8 mm
- Layout
- 125B 3-Knob (Type 1)
- Category
- Guitar effect
Export formats
- PDF: print at 1:1 scale
- SVG: vector graphic
About this drill template
Drill template for the PedalPCB Extreme Scream Machine, sized for a Hammond 125B enclosure (63.6 × 119.3 × 35.8 mm). The pre-positioned holes match the PCB's pot footprint exactly, with the footswitch centred below the 3-knob layout. Print at 1:1 scale, tape to the enclosure face, centre-punch, and drill. PCB and parts not included.
PedalPCB description: “Compare to Maxon Overdrive Extreme OD808X”
Compared to the Maxon OD808X, a hotter, higher-gain version of the classic OD808 Tube Screamer. Level, Tone and Drive keep the Screamer layout while offering more gain and output for heavier styles.
Tube Screamer voicing with extra gain and volume: still mid-focused, but harder-hitting.
Build notes
Three-knob layouts are the most common pedal format (gain, tone, level) with the pots centred above the footswitch.
The Hammond 125B is one of the most common DIY pedal enclosures: a touch larger than a 1590B, slightly smaller than a 1590BB, with room for almost any single-effect PCB plus 9V supply.
Vendor specs: Designed for a 125B enclosure with top-mounted jacks
Controls
- Level
- Tone
- Drive
Drill measurements
Hole centres for the 125B 3-Knob (Type 1) layout. X runs left to right from the centre of the face being drilled. On the enclosure face, Y is measured from the centre, positive towards the top. For holes on a side, Y is the distance down the wall, measured from the face edge. Export the PDF for a 1:1 printable version with a scale check.
| Hole | Face | X (mm) | Y (mm) | Diameter |
|---|---|---|---|---|
| LED | Enclosure face | 0 | 38.1 | 6.4 mm (0.25 in) |
| Pot | Enclosure face | -16.5 | 38.1 | 7 mm (0.28 in) |
| Pot | Enclosure face | 16.5 | 38.1 | 7 mm (0.28 in) |
| Pot | Enclosure face | 0 | 12.7 | 7 mm (0.28 in) |
| Footswitch | Enclosure face | 0 | -45 | 12 mm (0.47 in) |
| DC Jack | Top side | 0 | 14.2 | 8 mm (0.31 in) |
| Jack | Top side | -15.2 | 24.3 | 9.5 mm (0.37 in) |
| Jack | Top side | 15.3 | 24.3 | 9.5 mm (0.37 in) |
Jig A covers 125B 3-Knob (Type 1)
Drop it over the enclosure, punch a mark through the holes this build uses, then lift it off and drill. It wraps onto the sides too, so the jacks and DC socket are covered.
Both jigs, $12 →