Western Electric 143A preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Western Electric 143A is a vintage high-power tube amplifier with 6SN7 driver stages and four 350B beam tetrodes in parallel push-pull, rated about 75 watts (about 50 watts with 6L6s). Two 5R4GY rectifiers and an OC3 voltage regulator round out a heavily built, clean-headroom design.

• Made in: USA
• Wattage: 75W
• Channels: 1
• Preamp tubes: 6SN7
• Power tubes: 4× 350B

Tags: american, vintage, high-wattage, clean, power-amp.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.