Traynor Bass Master YBA-4 - Channel 2 preset

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

The YBA-4 is a two-channel Traynor Bass Master variant with a pair of 6CA7 (EL34) output tubes in fixed bias. Its channels mix into a Fender-style treble/bass stack with a 'low range expander', and a 'high range expander' in the phase-inverter feedback loop gives extra top-end control.

• Years produced: 1973–1980
• Made in: Canada
• Wattage: 45W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6CA7

Tags: canadian, vintage, bass, el34, two-channel, mid-wattage.

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.