Marshall 1959T 66 Jtm100T With Tremelo preset

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

The Marshall 1959T is a tremolo-equipped variant of the 100W Super Lead, produced in the mid-to-late 1960s, adding an onboard optical or bias tremolo circuit to the standard plexi architecture. Tremolo-equipped plexi heads are among the rarest and most sought-after Marshalls.

• Years produced: 1966–1969
• Made in: UK
• Wattage: 100W
• Channels: 2
• Preamp tubes: 4× ECC83
• Power tubes: 4× EL34

Tags: british, vintage, plexi, tremolo.

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.