SG SG100 Phase Shift - Clean preset

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

The SG-100 is a 1973 hybrid head from CMI Electronics, Gibson's parent company. Both channels are solid-state: Channel 1 has volume, bass and treble; Channel 2 adds a footswitchable 'waveform' distortion, bass/middle/treble and a four-position accent switch. An op-amp-driven spring reverb and a footswitchable four-speed phase shifter feed a mixer with master volume, and one 12AX7 drives a pair of 8417 output pentodes from a solid-state supply.

• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 1× 12AX7
• Power tubes: 2× 8417

Tags: american, hybrid, reverb, high-wattage, 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.