Sound City L/B 200 Plus - Brilliant preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Sound City's 200-watt L/B 200 Plus valve head, built for bass and lead. It has normal, brilliant and slave inputs, an active bass/mid/treble tone stack and a reverb send and return. ECC83 preamps drive an ECC81 long-tailed pair and four KT88s. It is huge, clean and tight-bottomed, with the firm British KT88 voice.

• Made in: UK
• Wattage: 200W
• Channels: 2
• Preamp tubes: ECC83, ECC81
• Power tubes: 4× KT88

Tags: british, vintage, kt88, high-wattage, bass, two-channel.

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.