Ampeg B-50R Rocket Bass preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg B-50R Rocket Bass is a late-1990s solid-state bass combo. A TL074 op-amp input stage with Gain feeds an optocoupler compressor/limiter and a four-band EQ of Bass, Low Mid, High Mid and Treble. The power stage is a pair of TDA2050 chip amplifiers running in bridge into an 8-ohm speaker, with a headphone jack that mutes the speaker and a line out. There is no effects loop on the drawing.

• Wattage: 50W
• Channels: 1

Tags: american, bass, solid-state, mid-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.