Ray Massie El Basso Model 363 - Channel 2 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Model 363 El Basso is a small tube amp from Ray Massie's St. George/Massie Electronics, sold through George's Music in Hollywood. Two inputs each get a 7025 triode with its own volume and treble-cut tone. The mixed signal goes to a 7025 cathodyne inverter and a cathode-biased pair of 6V6s, with an EZ81 rectifier and no negative feedback.

• Made in: USA
• Channels: 2
• Preamp tubes: 2× 7025
• Power tubes: 2× 6V6

Tags: american, vintage, bass, 6v6, low-wattage, two-channel.

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.