Ampeg 435S / 635S (Rhapsody / Zephyr) - Main preset

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

The 435S Rhapsody and 635S Zephyr are model names used in Ampeg's upscale early-1960s guitar combo lineup. These names indicated premium cosmetic packages over standard circuit configurations. The Main channel delivers clean 6L6-based American tone in the classic Ampeg tradition.

• Years produced: 1961–1965
• Made in: USA
• Wattage: 35W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6L6

Tags: guitar, american, vintage, mid-wattage, 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.