Yamaha G50 / G100 Series II (112, 115, 210, 212) - Lead preset

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

This page covers Yamaha's Series II G50 and G100 solid-state combos of 1979, rated 50 and 100 watts RMS in 1×12, 1×15, 2×10 and 2×12 versions. Channel A has Volume (pull Fat), Treble (pull Bright), Middle and Bass; Channel B adds Gain, JFET clipping and a Master with its own EQ. Relay A/B switching feeds a parametric EQ (Level, Q, Frequency) and an Accutronics spring reverb, both footswitchable.

• Made in: Japan
• Channels: 2

Tags: japanese, solid-state, 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.