Ampeg Duette / Dolphin II - Triode Channel preset

Close · 68/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

This early Ampeg preamp, used in the Duette and Dolphin II, feeds a separate main amplifier. The triode channel is a 6SN7 with Bass, Treble and Volume. An optional pentode channel uses a 6SJ7 with Treble, Bass and Volume on the Duette and Volume only on the Dolphin II. Tremolo comes from a 6SL7 phase-shift oscillator with Speed and a 6SN7 modulator with Intensity, wired into the triode channel. An Ultra-High control was optional.

• Made in: USA
• Channels: 2
• Preamp tubes: 2× 6SN7, 1× 6SJ7, 1× 6SL7

Tags: american, vintage, preamp, tremolo, two-channel.

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.