Altec Lansing 1530A preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Altec Lansing 1530A is a tube push-pull power amplifier for line-level program signals, built for professional installed sound. A high or low line input with a level control feeds two direct-coupled 12AY7 stages and a 6SN7 cathode-coupled phase inverter, driving two 6146 beam tetrodes on adjustable fixed bias with OA3/OC3 regulators. Two 5R4GY rectifiers power it, and the output is tapped from 4 ohms to a 70-volt line.

• Made in: USA
• Wattage: 70W
• Channels: 1
• Preamp tubes: 1× 12AY7, 1× 6SN7
• Power tubes: 2× 6146

Tags: american, vintage, power-amp, 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.