Sound City 100B preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Sound City 100B is a classic British 100-watt head sharing significant design heritage with early Marshall amplifiers through Jim Marshall's transformer involvement. It produces a bold, harmonically rich overdrive with a focused midrange and excellent note separation even at high gain. Players who discover these amps rarely let them go, citing a unique character that sits somewhere between a Marshall Plexi and a Hiwatt.

• Years produced: 1966–1973
• Made in: UK
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 4× EL34

Known for: Pete Townshend, David Gilmour.

Tags: british, vintage, crunch.

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.