Epiphone EA-71 preset

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

The EA-71 is a 1960s Epiphone tube bass amp driving a 16-ohm 15-inch speaker. Two inputs feed a 6EU7 stage with a passive bass network, then a volume control, a second 6EU7 triode and a treble control. A 6C4 gain stage and a 6EU7 phase inverter drive a push-pull pair of 6L6s on about 465 V with negative feedback. Power comes from a silicon diode rectifier with a filter choke, and there are power, polarity and standby switches.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6EU7, 1× 6C4
• Power tubes: 2× 6L6

Tags: american, vintage, bass, 6l6.

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.