Masco MAP-105 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The MAP-105 is a small valve amplifier built into a 1947 Masco (Mark Simpson Manufacturing Co., New York) phonograph. Its two inputs feed both triodes of a single 7F7 as two cascaded gain stages, with one volume control and no tone control. A single-ended, cathode-biased 6V6GT drives the built-in speaker, and a 6X5GT rectifies the supply. With only three valves it is a simple, low-power circuit that hobbyists sometimes convert for guitar.

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

Tags: american, vintage, 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.