What tubes does the Marshall Jmp Tremolo 50W 1987Tu use?

The Marshall Jmp Tremolo 50W 1987Tu uses 3× ECC83 (12AX7) preamp tubes and 2× EL34 power tubes.

When was the Marshall Jmp Tremolo 50W 1987Tu produced?

The Marshall Jmp Tremolo 50W 1987Tu was produced 1966–1975.

Marshall Jmp Tremolo 50W 1987Tu preset

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

The Marshall 1987T Super Lead Tremolo 50W adds a tube-driven tremolo circuit to the standard 1987 Super Lead platform, offering onboard amplitude modulation without altering the amp's core plexi character. The tremolo is controlled by a dedicated footswitch and a front-panel speed/intensity control, making it suitable for surf, blues, and psychedelic rock styles that dominated the late 1960s. The tremolo circuit was implemented carefully enough that it does not compromise the 1987's fundamental tone when disengaged, and examples with functioning tremolo circuits are prized by collectors and period-correct tone chasers.

Years produced: 1966–1975
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 3× ECC83 (12AX7)
Power tubes: 2× EL34

Tags: british, vintage, crunch.

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.