Ampeg B-15T / SVT-70T / SVT-100T preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg B-15T is a late-1980s solid-state bass amp from Ampeg's St. Louis Music era, sharing its preamp with the SVT-70T and SVT-100T. 0 dB and -15 dB inputs feed an op-amp stage with Gain, Ultra Hi and Ultra Low switches and a four-band active EQ built from op-amp gyrator sections. An optical limiter with LED, a Master, preamp out/power amp in jacks and a balanced XLR line out precede a discrete bipolar push-pull power amp.

• Made in: USA
• Channels: 1

Tags: american, bass, solid-state.

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.