Marshall JTM45 Reissue - Normal preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 2245 is Marshall's reissue of the JTM45 head, in production since 1989. It follows the original layout: High Treble and Normal channels with four inputs, a shared Treble/Middle/Bass stack with Presence, three ECC83s and a GZ34 valve rectifier. Unlike the hand-wired originals it is built on a circuit board and runs a pair of 5881s, for about 30 watts of warm, sagging early-Marshall tone.

• Years produced: 1989–present
• Made in: UK
• Wattage: 30W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× 5881

Known for: Gary Moore.

Heard on: Still Got The Blues — Gary Moore (1990).

Tags: british, vintage, reissue, crunch, kt66, mid-wattage, two-channel.

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.