Traynor Bass Master YBA-5 - Normal preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The YBA-5 Bass Master Mark 5 is a Traynor all-valve bass head from around 1970. Four inputs feed two 12AX7 halves, each pair with its own volume, which mix into a 12AX7 gain stage and a shared treble/bass stack with a Low Range Expander; a High Range Expander sits in the feedback loop. A 12AX7 long-tail inverter drives two fixed-bias 6CA7s from a silicon supply at over 500 V, voiced for wide-range bass response.

• Made in: Canada
• Wattage: 50W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6CA7

Tags: canadian, vintage, bass, 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.