Impact 60 PA preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This Impact 60 is an English all-tube 60-watt bass and guitar head from around 1970 to 1971, a sibling of the Bright version with slightly different coupling values. Two channels, each with two inputs, run an ECC83 gain stage into their own treble and bass network and volume, then a second gain stage, into an ECC83 long-tailed-pair inverter with feedback. Two fixed-bias EL34s on a solid-state supply give a British clean-to-crunch character.

• Made in: UK
• Wattage: 60W
• Channels: 1
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Tags: british, vintage, el34, clean.

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.