Fender Reverb Unit 6G15 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Fender Reverb Unit 6G15 is a standalone spring reverb unit, not an amplifier but a signal processor — the original outboard reverb device that Fender sold separately for use with amplifiers lacking built-in reverb. Featuring a tube-driven long-spring reverb tank, the 6G15 produces the deep, splashy spring reverb sound that became synonymous with surf music and classic American rock and roll. Many players still prefer the 6G15 to built-in amp reverb for its distinctive character.

• Years produced: 1961–1966
• Made in: USA
• Channels: 1
• Preamp tubes: 3× 12AX7, 1× 12AT7
• Power tubes: 1× 6K6

Known for: Dick Dale, The Ventures.

Tags: american, 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.