What tubes does the Marshall Sv20H use?

The Marshall Sv20H uses 4× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Marshall Sv20H produced?

The Marshall Sv20H was produced 2019–present.

Marshall Sv20H preset

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

The Marshall SV20H is a 20W (switchable to 5W) studio vintage head, introduced in 2019 as a lower-power version of the 1959SLP plexi circuit. It captures the full plexi-era tone at studio-friendly volumes, making the iconic Super Lead sound accessible without a full-power stage.

Years produced: 2019–present
Made in: UK
Wattage: 20W
Channels: 2
Preamp tubes: 4× ECC83
Power tubes: 2× EL34

Tags: british, plexi, reissue, low-watt, studio-vintage.

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.