What tubes does the Rivera R Series use?

The Rivera R Series uses 12AX7 preamp tubes and 6L6 power tubes.

When was the Rivera R Series produced?

The Rivera R Series was produced early 1980s.

Rivera R Series preset

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

The Rivera R Series represents Paul Rivera's work during his tenure at Fender in the early 1980s, where he redesigned several Fender amplifiers before founding Rivera Research and Design. These amplifiers carry forward the American clean tone tradition — glassy, responsive, and dynamically expressive — while adding improved gain staging and channel-switching capabilities that were advanced for their time. The R Series is historically significant as a bridge between classic Fender design and the modern boutique amp era.

Years produced: early 1980s
Made in: US
Channels: 2
Preamp tubes: 12AX7
Power tubes: 6L6

Tags: american.

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.