What tubes does the Randall RT100H / RT503H - OD 1 use?

The Randall RT100H / RT503H - OD 1 uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Randall RT100H / RT503H - OD 1 produced?

The Randall RT100H / RT503H - OD 1 was produced 2000s–2010s.

Randall RT100H / RT503H - OD 1 preset

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

The Randall RT100H and RT503H are all-tube, high-output heads from Randall's tube series, offering powerful clean and distorted tones with the brand's characteristic American punch and tight low end. These amps bridge Randall's solid-state legacy with the warmth and dynamic response that tube players demand. The RT series established Randall as a credible all-tube amp maker alongside its famous solid-state designs.

Years produced: 2000s–2010s
Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 4× 6L6

Tags: american, crunch, modern.

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.