What tubes does the Marshall 20W 2022 use?

The Marshall 20W 2022 uses 3× ECC83 (12AX7) preamp tubes and 2× EL34 power tubes.

When was the Marshall 20W 2022 produced?

The Marshall 20W 2022 was produced 1966–1973.

Marshall 20W 2022 preset

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

The Marshall 2022 is a 20-watt JMP-era bass combo, applying the Marshall circuit architecture to bass guitar amplification at a compact power level suitable for rehearsal and smaller venues. While Marshall's reputation centers on guitar amplification, these smaller JMP bass models served working bass players throughout the late 1960s and early 1970s. The EL34 output stage in bass mode produces a characteristically warm, slightly colored tone distinct from American-voiced bass amplifiers.

Years produced: 1966–1973
Made in: UK
Wattage: 20W
Channels: 1
Preamp tubes: 3× ECC83 (12AX7)
Power tubes: 2× EL34

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.