Ampeg Jet J-12-D (7868 Version) - Normal preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Jet J-12-D with 7868 output tubes is a variant of the mid-1960s Jet series using the unusual 7868 octal tetrode. The Normal channel delivers warm, midrange-focused tone with the distinctive compression characteristics of 7868 tubes. A less common variant that collectors seek for its unique tonal character.

• Years produced: 1963–1967
• Made in: USA
• Wattage: 18W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 7868

Tags: guitar, american, vintage, low-wattage, 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.