Gibson EH-185 - Microphone preset

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

The EH-185 is a pre-war Gibson amplifier with separate microphone and instrument inputs, each with its own volume, and a field-coil speaker. Two 6SQ7 stages on the microphone side and a third for the instruments mix into a tone control, then a 6N7 paraphase inverter drives a cathode-biased push-pull pair of 6L6s on a 5U4 rectifier, with the speaker field coil as the filter choke. Some versions add bass and treble controls and an echo-speaker jack.

• Years produced: 1939–1942
• Made in: USA
• Wattage: 18W
• Channels: 2
• Preamp tubes: 3× 6SQ7, 1× 6N7
• Power tubes: 2× 6L6

Known for: Charlie Christian.

Tags: american, vintage, clean, 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.