What tubes does the Marshall JTM1 use?

The Marshall JTM1 uses 2× 12AX7 preamp tubes and 1× 12AU7 power tubes.

When was the Marshall JTM1 produced?

The Marshall JTM1 was produced 2012.

Marshall JTM1 preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A 1-watt head from Marshall's 2012 50th Anniversary series, built as a small-scale take on the JTM45 era. Two 12AX7s form the preamp and a single 12AU7 works as a push-pull output stage, with a 1W/0.1W switch and simple loudness and tone controls. It aims to get vintage Marshall crunch at home volume.

Years produced: 2012
Wattage: 1W
Channels: 1
Preamp tubes: 2× 12AX7
Power tubes: 1× 12AU7

Tags: british, reissue, low-wattage, crunch, practice.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.