SWR SM-900 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The SM-900 is SWR's flagship two-rack-space bass head: a 12AX7 tube preamp feeding a high-power solid-state stereo power amp rated at 900 watts bridged. A limiter, active EQ and built-in crossover for bi-amping made it a staple of large-stage bass rigs in the 1990s.

• Made in: USA
• Wattage: 900W
• Channels: 1
• Preamp tubes: 12AX7

Tags: american, bass, hybrid, high-wattage, stereo.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.