What tubes does the Sound City Sound City L B 120 Mark Iv use?

The Sound City Sound City L B 120 Mark Iv uses 3× ECC83 preamp tubes and 4× EL34 power tubes.

When was the Sound City Sound City L B 120 Mark Iv produced?

The Sound City Sound City L B 120 Mark Iv was produced 1970–1975.

Sound City Sound City L B 120 Mark Iv preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sound City L/B 120 Mark IV combined high output power with the British tonal character the brand was known for, working equally well for both lead and bass applications. The Mark IV revision was the most polished version of the 120-watt circuit, incorporating stability improvements and a refined tone stack. This amp's blend of power, versatility, and tone made it a favorite for working musicians in the early 1970s.

Years produced: 1970–1975
Made in: UK
Wattage: 120W
Channels: 2
Preamp tubes: 3× ECC83
Power tubes: 4× EL34

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.