Sovtek MIG-500 preset

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

The Sovtek MIG-500 'Bassov Blue Midget' is a compact valve bass head. Low and High inputs feed a 12AX7WA gain stage, a Volume control and a second gain stage driving a treble/bass/middle tone stack, with a direct in/out jack after the EQ. A long-tail phase inverter drives two fixed-bias 5881s into 4/8/16-ohm jacks. The supply is a silicon bridge with standby, an adjustable bias supply and a regulated DC heater for the input valve.

• Made in: Russia
• Wattage: 50W
• Channels: 1
• Power tubes: 2× 5881

Tags: high-wattage.

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.