What tubes does the Rivera Rivera Knucklehead use?

The Rivera Rivera Knucklehead uses 5× ECC83 preamp tubes and 4× 6L6 power tubes.

When was the Rivera Rivera Knucklehead produced?

The Rivera Rivera Knucklehead was produced 1994–present.

Rivera Rivera Knucklehead preset

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

The Rivera Knucklehead is a 55-100W two-channel American amp designed by Paul Rivera. Running on 6L6 output tubes, it delivers warm, punchy American clean tones and high-gain overdrive with Rivera's characteristic articulation and build quality.

Years produced: 1994–present
Made in: USA
Wattage: 55W
Channels: 2
Preamp tubes: 5× ECC83
Power tubes: 4× 6L6

Tags: american, boutique, 6l6, two-channel.

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.