What tubes does the Carvin Quad-X FX Mod use?

The Carvin Quad-X FX Mod uses 12AX7 preamp tubes.

When was the Carvin Quad-X FX Mod produced?

The Carvin Quad-X FX Mod was produced 1990s.

Carvin Quad-X FX Mod preset

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

The Carvin Quad-X FX Mod documents an effects loop modification for the Quad X-Amp rack preamplifier, converting the effects routing from pre-EQ to post-EQ positioning.

Years produced: 1990s
Made in: USA
Channels: 4
Preamp tubes: 12AX7

Tags: american, high-gain, vintage.

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.