What tubes does the Marshall VBA400 Bass 400W use?

The Marshall VBA400 Bass 400W uses 4× ECC83 preamp tubes and 4× KT88 power tubes.

When was the Marshall VBA400 Bass 400W produced?

The Marshall VBA400 Bass 400W was produced 2006–2013.

Marshall VBA400 Bass 400W preset

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

The Marshall VBA400 is a 400W all-valve bass head featuring four KT88 power tubes, designed for extreme headroom and dynamic range in professional bass applications. Its massive power output and tube-driven warmth made it one of the most potent valve bass amplifiers ever built.

Years produced: 2006–2013
Made in: UK
Wattage: 400W
Channels: 1
Preamp tubes: 4× ECC83
Power tubes: 4× KT88

Tags: bass, high-power, british, valve.

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.