Oliver G150R / G200R - Full EQ preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Oliver G150R and G200R are 1970 tube guitar combos from Oliver Sound of Westbury, New York. Channel 1 is a simple 6EU7 path with volume and treble; Channel 2 adds its own treble, bass and mid-range stack with an ultra-high switch. Both mix into a 6EU7 phase inverter driving two fixed-bias 6L6GCs. Spring reverb (6DR7 driver, 6EU7 recovery) and a 6EU7 tremolo with speed control are each footswitchable, on a solid-state rectified supply.

• Made in: USA
• Channels: 2
• Preamp tubes: 4× 6EU7, 1× 6DR7
• Power tubes: 2× 6L6GC

Tags: american, vintage, reverb, tremolo, 6l6, two-channel.

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.