Sound City Bass 150 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sound City Bass 150 is a high-powered valve bass head made in England by Dallas Music Industries. High- and low-gain inputs feed an ECC83 with a Volume control, then two bass controls covering different bands (30–300 Hz and 250–600 Hz) and a Treble control, followed by a second ECC83 recovery stage. An ECC81 long-tail phase inverter, fed back from a dedicated feedback winding, drives four fixed-bias KT88s, with a silicon-bridge supply, standby and a 4/8/16-ohm selector.

Tags: british, vintage, bass, high-wattage.

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.