What tubes does the Ampeg V9Preamp use?

The Ampeg V9Preamp uses 6× 12AX7 preamp tubes.

When was the Ampeg V9Preamp produced?

The Ampeg V9Preamp was produced 1971–1975.

Ampeg V9Preamp preset

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

The Ampeg V-9 preamplifier schematic covers the guitar-voiced preamp section of the flagship V-9 guitar head. The V-9 preamp used multiple 12AX7 gain stages tuned for guitar frequency content, with a tone stack and channel structure adapted from the V-4 design and scaled for the 300-watt output stage. As the preamp of one of the most powerful guitar amplifiers ever built, the V-9 preamp provides clean gain staging that only begins to distort at extreme drive levels.

Years produced: 1971–1975
Made in: USA
Channels: 2
Preamp tubes: 6× 12AX7

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.