Altec Lansing 1569A preset

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

The Altec Lansing 1569A is a professional tube power amplifier, the four-output-valve big brother of the 1568A. A line input with an optional plug-in matching transformer feeds a level control and two direct-coupled 6CG7 stages, then a 6CG7 cathode-coupled phase inverter driving four 6CA7/EL34s in parallel push-pull on fixed bias. Two 5U4GB rectifiers power it, and a multi-tap output runs from 4 ohms to a 70-volt line. There are no tone controls.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6CG7
• Power tubes: 4× 6CA7

Tags: american, vintage, power-amp, el34, 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.