Ampeg M-15 (6L6 Version) - Accordion preset

Close · 74/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The M-15 with 6L6 output tubes is an alternate schematic for Ampeg's 15-inch accordion and instrument amplifier. The Instrument channel provides clean, transparent amplification. This version confirms the 6L6 power stage specification as used in the M-15 during its production.

• Years produced: 1961–1966
• Made in: USA
• Wattage: 25W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 6L6

Tags: american, vintage, low-wattage, clean, accordion.

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.