Traynor Bass Master YBA-1 (Late Version) - Bright preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This is the mid-1970s revision of Traynor's YBA-1 Bass Master, drawn for both the YBA-1 head and YBA-4 combo. Two channels, each with two inputs, a 12AX7A stage and its own volume, mix into a 12AX7A gain stage, a presence control and a shared treble/bass stack with a Low Range Expander; a High Range Expander sits in the feedback loop. A 12AX7A long-tail inverter drives two fixed-bias 6CA7s from a silicon bridge supply with a standby switch.

• Years produced: 1976–1980
• Made in: Canada
• Wattage: 45W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6CA7

Tags: canadian, vintage, bass.

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.