ST20H

The unrivalled number one is here, just smaller. Reproducing the legendary, warm and smooth tones of the original Marshall JTM, the Studio JTM packs a punch. Swap between 20W and 5W at the flick of a switch and let the era-defining sound of the JTM steal the show, whether it’s playing at home, or on stage. Make sure to pair the ST20H with one of our Studio cabinets for a small but perfectly formed Marshall rig.

First look

Hear the ST20H

Clean 1 Presence 6, Bass 5, Mid 4, Treble 6, High Treble 6, Normal 5 (Singlecoil strat)

Clean 2 Presence 8, Bass 3, Mid 3, Treble 8, High Treble 4, Normal 4 (Singlecoil strat)

Clean 3 Presence 6, Bass 3, Mid 3, Treble 5, High Treble 10, Normal 0 (Singlecoil strat)

Crunch 1 Presence 7, Bass 3, Mid 6, Treble 7, High Treble 10, Normal 4 (HSS strat style)

Crunch 2 Presence 6, Bass 3, Mid 6, Treble 6, High Treble 10, Normal 4 (Les Paul)

Key features

Outstanding Marshall Sound

An unmistakable sound that is recognised all over the world, the ST20H is a loving homage to the amp that responded to the rock’n’roll revolution. From its legendary warm and smooth tone to blending the voices for a combination of crunch and clean, the ST20H brings the outstanding sound that Marshall is so well known for.

Power Reduction

Whether you're playing at home or an intimate gig, swap between 20W and 5W at the flick of a switch thanks to built-in power reduction technology. The 5W mode allows playing at a lower wattage without compromising on tone.

Compact Without Compromise

Accurately recreating the iconic look seen across thousands of stages over the years, the ST20H has the power of a classic Marshall amp in a new, more compact design. Packed with the same vintage tones you know and love, just in a smaller package. Features such as a DI out and FX loop have been added, bringing the JTM into the present day.

UK-Made and All-Valve

Handmade in the same UK factory that has been manufacturing Marshall amps since the late 60s, the ST20H is built on decades of experience with expert craftsmanship at the very heart. Loaded with two ECC83 preamp valves, two 5881 power amp valves and one ECC83 phase splitter, the ST20H takes you right back to the renaissance of rock’n’roll.

Technical specification

General

Model

ST20H

Range

Studio

Technology

Valve

Channels

1 with 2 voicings

Electronics

Output wattage

20W (with power reduction option to 5W)

Outputs

5 x 1/4” jack sockets (16Ω load / 8Ω load / 4Ω load)

Inputs

4 x 1/4" jack instrument inputs (high/low sensitivity)

Controls

Treble, Middle, Bass and Presence

Effects

None

Effects loop

Yes, send/return

Valves

Preamp valves

2 x ECC83, 1 x ECC83 (phase splitter)

Power amp valves

2 x 5881

Accessories

Cable

Detachable power cable included

Cable

Speaker cable included

Dimensions (including feet and handle)

Weight

9.25kg / 20.4lbs

Width

500mm / 19.7"

Height

240mm / 9.4"

Depth

230mm / 9.1"

The Art of Amp Making

Shrinking down an iconic amp requires clever design and engineering but luckily there’s no shortage of that in our UK headquarters.

Why mess with a winning formula? We know exactly what it takes to make a legendary amp and we’ve applied those same hand-assembly techniques to the Studio Series. Every Studio amp is designed, engineered and constructed at our UK headquarters, where it gets our seal of approval before it hits the shelves.

ST20H

First look

Hear the ST20H

Key features

Outstanding Marshall Sound

Power Reduction

Compact Without Compromise

UK-Made and All-Valve

Official demo

Technical specification

General

Electronics

Valves

Accessories

Dimensions (including feet and handle)

The Art of Amp Making

Where next?

ST20H

First look

Hear the ST20H

Key features

Outstanding Marshall Sound

Power Reduction

Compact Without Compromise

UK-Made and All-Valve

Official demo

Technical specification

General

Electronics

Valves

Accessories

Dimensions (including feet and handle)

Studio JTM in action

The Art of Amp Making

Recommended products

Where next?