Product Overview

Handcrafted in the UK and inspired by the first-ever Marshall amplifier, the Studio JTM ST20H delivers the legendary smooth, bluesy tones that launched a revolution. This 20W head captures the raw, organic heart of the original JTM45 in a compact, lunchbox-style format. Designed, engineered, and built in the UK, it is the ultimate tool for guitarists who want vintage British warmth without the immense volume of a full-sized vintage head.

Product Description

• The Sound of 1962: The ST20H accurately recreates the iconic JTM tone—renowned for its warm cleans and creamy, harmonic crunch. This is the amp that initially defined the "Marshall sound," now refined for the contemporary player.

• Dual Bridgeable Voices: Featuring the classic four-input layout, the ST20H offers two distinct voices: Normal and High Treble. For a truly unique and thick sound, you can "jump" the channels with a patch cable to blend the two voices together, creating a custom tonal balance.

• Authentic 5881 Power Section: To stay true to the original 60s DNA, the ST20H is powered by two 5881 power amp valves. These valves provide a specific "glassy" high end and rounded low end that differs from the later EL34-based models.

• Power Reduction Technology: Whether you are on a big stage or in a home studio, you can swap between 20W and 5W with ease. This built-in power scaling allows you to drive the valves into natural saturation at lower volumes without compromising on tone.

• Modern Studio Connectivity: While the soul is vintage, the features are modern. The ST20H includes a series FX loop for your favorite pedals and a DI output for seamless recording or direct-to-PA connection.

   

   

Key Features

• Built in the UK Factory: Precision-engineered in Bletchley, England, ensuring world-class build quality.

• All-Valve Circuitry: Driven by three ECC83 preamp valves and two 5881 power valves for authentic, touch-responsive dynamics.

• Classic 3-Band EQ: Familiar Treble, Middle, Bass, and Presence controls allow for precise sound sculpting.

• Portable and Lightweight: At only 9.25 kg, this head is easy to transport while still delivering professional stage volume.

   

Hear the ST20H

• Clean 1: Crystal clear with a woody, vintage chime; perfect for blues and jazz.

• Crunch 1: A touch of break-up that responds perfectly to your guitar's volume knob.

• Crunch 2: Rich, thick saturation—the definitive classic rock lead tone.

Technical Specifications

Included in the Box

• Marshall ST20H Amplifier Head

• Speaker Cable (to connect to your cabinet)

• Detachable Power Cable