Marshall 20W PA 1917 - Bright preset

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

The Marshall 1917 is a 20-watt valve PA amplifier from Marshall's small-box 20 W range of the late 1960s, sharing its circuit with the 2019 Bass and 2022 Lead. Two input pairs feed the two halves of one ECC83, each with its own volume and tone control, mixed into an ECC83 phase inverter driving two cathode-biased EL84s off a silicon-diode supply into 4, 8 or 16 ohms. There is no master volume or presence.

• Made in: UK
• Wattage: 20W
• Channels: 2
• Preamp tubes: 2× ECC83
• Power tubes: 2× EL84

Tags: british, vintage, el84, low-wattage, clean, 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.