Selmer Rotary Selectortone - Normal preset

Close · 70/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

A two-channel Selmer valve amp built around the rotary Selectortone switch, which gives preset tone voicings at the turn of a knob. ECC83 and EF86 preamp stages and a valve tremolo oscillator make up the preamp. The surviving drawing covers only the preamp, so the output stage is not documented here.

• Made in: UK
• Wattage: 15W
• Channels: 2
• Preamp tubes: ECC83, EF86

Tags: british, vintage, tremolo, two-channel, low-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.