What tubes does the Orange OR120 GRO 100 use?

The Orange OR120 GRO 100 uses 4× ECC83 (12AX7) preamp tubes and 4× EL34 power tubes.

When was the Orange OR120 GRO 100 produced?

The Orange OR120 GRO 100 was produced 1973–1979.

Orange OR120 GRO 100 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Orange GRO-100 is a 100-watt amplifier from the mid-1970s Orange lineup, sharing the fundamental circuit architecture of the OR120 family while operating at a slightly reduced power level suited to a broader range of stage and studio applications. Its four EL34 output tubes are voiced to deliver the warm, thick harmonic density that characterises all Orange amplifiers of the period, with the GRO series placing a particular emphasis on controllable, musical saturation. The GRO-100 represents Orange at its most tonally focused — a single-channel instrument built around a consistent, characterful sound.

Years produced: 1973–1979
Made in: UK
Wattage: 100W
Channels: 1
Preamp tubes: 4× ECC83 (12AX7)
Power tubes: 4× EL34

Tags: british, crunch, vintage.

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.