What tubes does the Masco MAP-18 - Input 3 use?

The Masco MAP-18 - Input 3 uses 2x 12AX7 preamp tubes and 2x 6V6 power tubes.

When was the Masco MAP-18 - Input 3 produced?

The Masco MAP-18 - Input 3 was produced 1950–1960.

Masco MAP-18 - Input 3 preset

Close · 65/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Masco MAP-18 is an 18-watt PA amplifier sitting between the MAP-15 and the larger MAP series in Masco's commercial lineup. Its circuit features a cathode-biased output stage that contributes a soft, slightly compressed character when driven. As a guitar conversion, the MAP-18 provides slightly more volume and headroom than the MAP-15 while retaining the same musical quality.

Years produced: 1950–1960
Made in: USA
Wattage: 18W
Channels: 1
Preamp tubes: 2x 12AX7
Power tubes: 2x 6V6

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.