Sound City L/B 100 (M3234) - Normal preset

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

The Sound City L/B 100 (type M3234, drawing 100/2/15) is a 100-watt valve head made in England by Dallas Arbiter. Brilliant and Normal inputs each have their own ECC83 half and volume, mixed into a Treble/Middle/Bass stack with factory presets, a Presence control and a further ECC83 gain stage. An ECC81 long-tail phase inverter drives four EL34s in fixed bias from a bias winding, with a silicon-bridge supply, standby switch and 4/8/16-ohm plus 100 V line outputs. The Middle control is omitted on bass units.

• Made in: UK
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× ECC83, 1× ECC81
• Power tubes: 4× EL34

Tags: british, vintage, el34, high-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.