Altec Lansing 353A (Sams Photofact) - Ch B preset

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

The Altec Lansing 353A is a professional-grade tube power amplifier from Altec Lansing, the storied American loudspeaker and audio electronics company. Altec Lansing was a major supplier to broadcast studios, cinemas, and live sound installations throughout the postwar decades. This model was documented in Sam's Photofact, indicating it was a widely serviced professional unit.

• Years produced: 1950–1965
• Made in: USA
• Channels: 1

Tags: american, vintage.

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.