What tubes does the Marshall Jtm45Tr use?

The Marshall Jtm45Tr uses 4× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Marshall Jtm45Tr produced?

The Marshall Jtm45Tr was produced 1966–1973.

Marshall Jtm45Tr preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall JMP 1987TU is a 50W version of the plexi Lead head fitted with an onboard tremolo circuit, offering the classic 1987 tone with added modulation. Tremolo-equipped Marshalls from this era are uncommon and prized for their combination of rare features.

Years produced: 1966–1973
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 4× ECC83
Power tubes: 2× EL34

Tags: british, vintage, tremolo, plexi.

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.