Precision Electronics S-35 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A 35-watt tube public-address amplifier from Grommes-Precision, not a guitar amp. Two mic inputs plus phono and aux inputs feed a 6C4 cathodyne inverter and two 7868 output tubes, with 70-volt and 25-volt line taps for installed sound systems.

• Made in: USA
• Wattage: 35W
• Channels: 1
• Preamp tubes: 2× 6EU7, 1× 6C4
• Power tubes: 2× 7868

Tags: american, vintage, clean, mid-wattage.

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.