What tubes does the Marshall Rackmount Preamp 9001 use?

The Marshall Rackmount Preamp 9001 uses 5× ECC83 (12AX7) preamp tubes and N/A (preamp only) power tubes.

When was the Marshall Rackmount Preamp 9001 produced?

The Marshall Rackmount Preamp 9001 was produced 1988–2000.

Marshall Rackmount Preamp 9001 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall 9001 is a two-channel rack-mounted valve preamp that brings the JCM800's preamp architecture into a 2U rackmount format. Five ECC83 preamp valves drive clean and overdrive channels with independent EQ sections, designed to feed the 9005 valve power amp or the 8004/8008 solid-state power amps. A built-in programmable MIDI switching system allows channel and effect loop switching from a MIDI controller or pedalboard, making it one of the first widely-used programmable Marshall preamps and a defining piece of the elaborate rack rigs that dominated professional touring in the late 1980s and 1990s.

Years produced: 1988–2000
Made in: UK
Channels: 2
Preamp tubes: 5× ECC83 (12AX7)
Power tubes: N/A (preamp only)

Tags: british, crunch.

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.