Marshall JTM100 Super Tremolo 1959T - Tremolo preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This is an early 100-watt Marshall Super Tremolo head, type 1959T, from the mid-1960s, with the Bassman-derived circuit that preceded the EL34 plexi Super Leads. Four inputs feed two channels with their own volumes into a gain stage and cathode follower driving Treble, Middle and Bass. A separate valve oscillator with speed and intensity adds footswitchable tremolo, and a long-tail inverter with Presence drives four KT66 output valves.

Tags: british, vintage, tremolo, kt66, high-wattage, two-channel.

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.