Marshall JH-1 Jackhammer guitar effect box

Marshall JH-1 Jackhammer guitar effect box

Marshall JH-1 Jackhammer is a dual-mode, high-gain overdrive and distortion pedal originally released in 1998. Built with a rugged, solid metal casing, it was designed to deliver classic, aggressive Marshall valve amp saturation in a compact stompbox format.

Core Controls & Features

The pedal offers deep tonal flexibility by packing seven parameters into space-saving dual-concentric pots:

Mode Switch: Toggles between "OD" (dynamic overdrive/crunch) and "Dist" (high-gain, modern super distortion).

Gain & Volume: Stacked pot controlling the overall output and signal saturation.

Bass & Treble: Stacked pot for standard dual-band EQ shaping.

Contour & Frequency: A parametric mid-section that shifts frequencies and adjusts mid-scooping.

Power: Operates on a standard 9V DC center-negative power supply or a 9V battery.