Altec Lansing 353A preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Altec Lansing 353A is an early-1960s stereo tube integrated amplifier for home hi-fi. A selector picks mic, tape head, magnetic or ceramic phono, radio, tape or multiplex, with two 12AX7 preamp stages per side and phono/tape equalisation. Balance, loudness and a rumble filter precede Bass and Treble, then a 12AX7 gain stage and 12AX7 phase inverter per side driving a push-pull pair of 6L6GCs, with stereo/mono and centre-speaker outputs.

• Made in: USA
• Channels: 1
• Preamp tubes: 5× 12AX7
• Power tubes: 4× 6L6GC

Tags: american, vintage, stereo, 6l6, clean.

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.