Kustom 400 (PC704B Power Amp) - Main preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

Kustom Electronics was an American amplifier company famous for their distinctive tuck-and-roll Naugahyde-covered solid-state amps of the late 1960s and 1970s. The 400 with PC704B power amp represents the company's high-powered solid-state offerings aimed at the bass and PA market. Kustom gear is immediately recognizable and collected for its unique aesthetic and historical place in American rock and roll.

• Years produced: 1970s
• Made in: USA
• Channels: 1

Tags: american, solid-state, modern.

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.