Masco MAP-105N preset

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

The MAP-105N (Sams Photofact 1948) is a small AC musical-instrument amplifier. Two inputs feed one 7F7 twin triode used as two cascaded gain stages, with a single volume control and no tone control, driving a single cathode-biased 6V6GT in single-ended class A with feedback from the speaker winding, from a 6X5GT rectifier. Masco (Mark Simpson Manufacturing Co.) built PA and instrument amplifiers in New York, and many are now converted for guitar.

• Made in: USA
• Wattage: 5W
• Channels: 1
• Preamp tubes: 1× 7F7
• Power tubes: 1× 6V6GT

Tags: american, vintage, 6v6, class-a, low-wattage.

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.