What tubes does the Rivera Knucklehead use?

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

When was the Rivera Knucklehead produced?

The Rivera Knucklehead was produced 1994–2000s.

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-watt (or 100-watt in the Tres version) multi-channel tube amp head that brought Rivera's boutique sensibility to a more accessible price point. It features two footswitchable channels with extensive EQ options and delivers high-gain tones with clarity and note separation that stood out from competitors in the 1990s. The Knucklehead's combination of Fender-style clean tones and tight, articulate lead sounds made it a studio workhorse.

Years produced: 1994–2000s
Made in: US
Wattage: 55W
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.