What tubes does the Orange GRO100 use?

The Orange GRO100 uses 2× ECC83 preamp tubes and 4× EL34 power tubes.

When was the Orange GRO100 produced?

The Orange GRO100 was produced 1972–1975.

Orange GRO100 preset

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

The GRO100 is the 100-watt Pics Only Graphic head launched in 1972, the amp that set the Orange sound. A single channel with Hi and Lo inputs runs two ECC83 gain stages with Gain, Bass and Treble controls and the six-position FAC midrange switch, then an H.F. Drive control and a cathodyne phase inverter push four EL34s hard into thick, crunchy overdrive. Reverb send and return and a slave output sit on the back.

Years produced: 1972–1975
Made in: UK
Wattage: 100W
Channels: 1
Preamp tubes: 2× ECC83
Power tubes: 4× EL34

Tags: british, vintage, crunch, el34, high-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.