Selmer Bassmaster 50 - Bass preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Selmer Bassmaster 50 is a 50-watt valve bass amplifier from Selmer London, drawn in 1963. It has two channels: a Bass input with its own volume, bass and treble on ECC83 stages, and a Normal input with its own volume, bass and treble. An ECC83 phase inverter drives a fixed-bias push-pull pair of EL34s, with a GZ34 rectifier and a neon pilot lamp.

Tags: british, vintage, bass, el34, mid-wattage, 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.