Gretsch 6157 preset

Verified · 87/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Gretsch G6157 is a Valco-built bass amplifier with a single channel: three inputs into a 12AX7, a tone control, a three-position Range switch (High Bass, Low Bass, Guitar) that changes the voicing, and a volume control before the second gain stage. A 12AX7 long-tail inverter drives four 6L6s as two cathode-biased push-pull pairs, each into its own output transformer, from a silicon-diode bridge rectifier with standby switch.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 4× 6L6

Tags: american, vintage.

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.