Sound Studio Studio 20 (BIG 15) preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sound BIG 15 / Studio 20 is a small Italian valve combo. Two inputs feed an ECC83 stage, then Bass and Treble controls and a Volume. The output stage uses two ECL82 triode-pentodes: their triode halves give a gain stage and a paraphase phase inverter, and their pentodes run push-pull with a shared cathode resistor and negative feedback from the output. An ECC83 phase-shift tremolo has Speed and Intensity, and the 15RT version adds an ECC82-driven spring reverb with its own Intensity. Two BY127 diodes rectify at about 295 V.

• Made in: Italy
• Wattage: 20W
• Channels: 1
• Power tubes: 2× ECL82

Tags: italian, vintage, clean.

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.