Marshall Studio Vintage SV20H - High Treble preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The SV20H Studio Vintage is a 20-watt plexi head introduced in 2019, based on the 1959 Super Lead circuit. Four inputs feed two channels (Loudness 1 and 2) on a bright-capped ECC83, then a second ECC83 into a Treble, Middle and Bass stack with Presence. An ECC83 long-tail phase inverter drives two fixed-bias EL34s, with a 20/5-watt power switch, a bypassable series effects loop and an emulated DI output for plexi crunch at studio volumes.

• Years produced: 2019–present
• Made in: UK
• Wattage: 20W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Known for: Joe Hottinger.

Tags: british, plexi, crunch, el34, low-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.