Rob Robinette RR2104 Master Volume Micro preset

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

The RR2104 Micro (drawn as RR800M JCM800 Micro) keeps Rob Robinette’s full JCM800 2204 preamp on three 12AX7s: high and low inputs, preamp volume with bright cap, 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 both halves of a 12AU7 as a true push-pull output stage for about 1 watt, with negative feedback and elevated heaters.

• Made in: USA
• Wattage: 1W
• Channels: 1
• Preamp tubes: 3× 12AX7
• Power tubes: 1× 12AU7

Tags: american, diy, crunch, high-gain, low-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.