Rob Robinette RR2104 Master Volume 6V6 preset

Verified · 95/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The RR2104 6V6 (drawn as RR800V) is Rob Robinette’s version of the Marshall JCM800 2204 master-volume circuit. It keeps the 2204 preamp: a 12AX7 input stage with bright cap and preamp volume, a cold-clipper stage, a third gain stage and a cathode follower into the treble/bass/mid stack and master volume. A 12AX7 long-tail inverter with presence drives a fixed-bias pair of 6V6GTs in place of the EL34s, with adjustable bias and elevated heaters.

• Made in: USA
• Wattage: 18W
• Channels: 1
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6V6GT

Tags: american, diy, crunch, high-gain, 6v6.

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.