What tubes does the Fender 400PS use?

The Fender 400PS uses 4× 12AX7 preamp tubes and 8× 6L6GC power tubes.

When was the Fender 400PS produced?

The Fender 400PS was produced 1970–1975.

Fender 400PS preset

Close · 65/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Fender 400PS is one of the most powerful tube amplifiers Fender ever produced, delivering 400 watts through eight 6L6GC output tubes arranged in a pseudo-stereo piggyback configuration. Aimed squarely at the bass and steel-guitar market of the early 1970s, it provided thunderous clean headroom that guitar amps of the era simply could not match. Today it is a rare curiosity, valued by collectors and engineers studying the limits of CBS-era Fender engineering.

Years produced: 1970–1975
Made in: USA
Wattage: 400W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 8× 6L6GC

Tags: american, clean.

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.