Traynor Bass Master YBA-1 - Bright preset

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

The YBA-1 Bass Master is the head that established Traynor in 1964, a Pete Traynor design. Two channels, each with two inputs, a 12AX7A stage and its own volume, mix into a second 12AX7A and a shared treble/bass stack with a Low Range Expander, while a High Range Expander sits in the negative-feedback loop. A 12AX7A long-tail inverter drives a pair of 7027As from a silicon supply with a choke. Built for bass, it has long been a guitarists' favourite too.

• Years produced: 1964–1980
• Made in: Canada
• Wattage: 45W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 7027A

Known for: Billy Zoom, Donna Grantis.

Heard on: The Have Nots — X (1982).

Tags: canadian, vintage, bass, el34, mid-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.