Ampeg Jupiter 42 B-42X - Channel 2 preset

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

The Ampeg Jupiter 42 B-42-X is a two-channel guitar and instrument combo from Linden, New Jersey. Each channel has Bright and Normal inputs, two 12AX7 stages and its own Volume, Bass and Treble with Ultra Hi and Ultra Lo switches. A 6CG7 drives the echo (spring reverb) unit with a selector and footswitch, recovered by a 12AX7 with a Dimension control, and a 12AX7 vibrato adds After-Beat. A 7199 drives two fixed-bias 7027As.

• Made in: USA
• Channels: 2
• Preamp tubes: 4× 12AX7, 1× 6CG7, 1× 7199
• Power tubes: 2× 7027A

Tags: american, vintage, reverb, vibrato, tremolo, two-channel.

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.