Selmer Stereomaster preset

verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Selmer Stereomaster is two complete 50-watt valve amplifiers on one chassis. Each channel has two inputs into an ECC83 triode, a six-position rotary tone selector (Standard, High Treble, Treble, Medium, Bass, Contra Bass), volume and a second ECC83 stage, then an ECC83 long-tail inverter driving its own pair of EL34s, output transformer (7.5/15 ohm), GZ34 and choke. An S/M switch sets stereo or mono use.

• Made in: UK
• Wattage: 100W
• Channels: 1
• Preamp tubes: 4× ECC83
• Power tubes: 4× EL34

Tags: british, vintage.

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.