Red Bear MK120 preset

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

The Red Bear MK120 is a single-channel tube head from the Russian-valve Red Bear line. High and low inputs feed 6N2P-EB dual triodes (a 12AX7-type equivalent) with two footswitchable Sensitivity switches and a Gain control, then a treble, bass and mid stack with Volume and Presence. A long-tail inverter drives four fixed-bias 5881s into 4, 8 and 16 ohm taps, with a silicon bridge rectifier, standby switch and adjustable bias supply.

• Made in: Russia
• Wattage: 120W
• Channels: 1
• Preamp tubes: 3× 6N2P-EB
• Power tubes: 4× 5881

Tags: crunch, high-gain, plexi, el84.

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.