Marshall 100W PA Amplifier Model 1968 - Channel 2 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Marshall Model 1968 and 1966 are 100W and 200W PA amplifier heads from the late 1960s and early 1970s, designed for vocal and instrument PA use in large venues. Their clean, high-headroom circuit has made them interesting platforms for guitarists who repurpose PA heads.

• Years produced: 1966–1974
• Made in: UK
• Wattage: 100W
• Channels: 4
• Preamp tubes: 4× ECC83
• Power tubes: 4× EL34

Tags: british, vintage, pa, 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.