Impact Studio PA preset

Verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Studio P.A. was a small Impact PA amplifier from Pan Musical Instrument Co, London, drawn in August 1968. Four identical ECC83 preamps with bass, treble and volume mix into a master volume, then an EF86 gain stage and an ECC83 phase inverter. Two cathode-biased EL84s handle the output. With its EF86 stage and EL84 output, it sounds much like British EL84 guitar amps of the period.

• Made in: UK
• Channels: 1
• Preamp tubes: 5× ECC83, 1× EF86
• Power tubes: 2× EL84

Tags: british, vintage, el84.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.