What tubes does the Sound City Sound City L B Plus 50 use?

The Sound City Sound City L B Plus 50 uses 3× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Sound City Sound City L B Plus 50 produced?

The Sound City Sound City L B Plus 50 was produced 1968–1973.

Sound City Sound City L B Plus 50 preset

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

The Sound City L/B Plus 50 offered a balanced combination of power and tonal flexibility, suitable for recording and smaller venues as well as medium-sized stages. The dual lead/bass configuration gave players flexible routing options, and the 50-watt output from two EL34s provided the classic British crunch at more achievable volume levels than the larger models. This remains one of the more attainable Sound City models for collectors today.

Years produced: 1968–1973
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 3× ECC83
Power tubes: 2× 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.