What tubes does the Marshall Powerbrake use?

The Marshall Powerbrake uses — preamp tubes and — power tubes.

When was the Marshall Powerbrake produced?

The Marshall Powerbrake was produced 1990s.

Marshall Powerbrake preset

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

The Marshall Powerbrake is a reactive power attenuator designed to be inserted between an amplifier head and speaker cabinet, allowing the amp to run at full power while reducing the volume reaching the speakers. It is not an amplifier — it is an attenuation device.

Years produced: 1990s
Made in: UK
Preamp tubes: —
Power tubes: —

Tags: attenuator, power-brake.

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.