What tubes does the Sound City Sound City 120 Mkiv use?

The Sound City Sound City 120 Mkiv uses 3× ECC83 preamp tubes and 4× EL34 power tubes.

When was the Sound City Sound City 120 Mkiv produced?

The Sound City Sound City 120 Mkiv was produced 1970–1975.

Sound City Sound City 120 Mkiv preset

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

The Sound City 120 Mark IV was the final and most refined iteration of the company's 120-watt amplifier design, incorporating circuit improvements gathered through years of player feedback and field use. The Mark IV revision brought tighter low-end response and improved channel separation compared to earlier versions. It stands as one of the definitive high-power British amp designs of 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.