Guitars Pedals Amps & Stuff

  • Marshall SC20H Studio Classic JCM800 20W Valve Amp Head
Marshall SC20H Studio Classic JCM800 20W Valve Amp Head - Image 1


Marshall SC20H Studio Classic JCM800 20W Valve Amp Head

View more in ,
Tags: , , ,
View more by

As an affiliate partner, we may earn a small commission when you buy through our links — at no extra cost to you.

£799.00

This is the Marshall SC20H Studio Classic JCM800 20W Valve Amp Head from Marshall, now available in the Amps category on Guitars Pedals Amps and Stuff.. Read More below.

Description

The Marshall SC20H Studio Classic is a mini head version of one of the most popular valve amps in history – the iconic JCM800 2203!

Now available in a portable 'Studio Classic' format, the all-valve SC20H head stays true to the legendary JCM800 formula with its single-channel design and High/Low sensitivity inputs.

Authentic JCM800 Tones

Marshall's original JCM800 was used by countless rockstars throughout the '80s and '90s, including Billy Corgan, Jeff Beck and Tom Morello; spanning many different genres and proving just how versatile the amp circuit is.

The SC20H Studio Classic delivers the full spectrum of JCM800 2203 tone, from rich and full cleans to heavier driven aggressive sounds – all in a compact enclosure. Driven by a pair of EL34 power tubes for that unmistakable British sound, the SC20H also closely adheres to the JCM800's simple control layout with a master volume, 4-band EQ and preamp volume knob.

Power Reduction

One of the Studio Classic's coolest features is its power reduction switch. Letting you power down from the full 20W to 5W, the lower wattage allows you to drive the tubes harder at quieter volumes so that you can still attain those gnarly, saturated cranked valve amp sounds at bedroom levels!

DI Output & Effects Loop

The Marshall SC20H Studio Classic is equipped with a DI output, which allows you to plug the amp directly into your recording interface and capture its tones with an emulated mic'd up cab sound. This is what makes the SC20H so versatile and studio-friendly – hence the name!

If you're a stompbox fanatic, the SC20H can serve as an excellent pedal platform with its dedicated effects loop. Just plug your favourite modulation and time-based pedals in via the loop and enjoy seamless sonic bliss!

Specifications

General

  • Model: SC20H
  • Range: Studio
  • Technology: Valve
  • Channels: 1

Electronics

  • Output Wattage: 20W (with power reduction option to 5W)
  • Outputs: 5 x 1/4” jack sockets, selectable 16Ω / 8Ω / 4Ω load
  • Inputs: 2 x 1/4" jack instrument inputs (high/low sensitivity)
  • Controls: Presence, bass, middle, treble, master volume, preamp volume
  • Effects: None
  • Effects Loop: Yes, series, send/return

Valves

  • Preamp Valves: 2 x ECC83, 1 x ECC83 (phase splitter)
  • Power Amp Valves: 2 x EL34

Accessories

  • Cable: Detachable power cable included, speaker cable included

Dimensions

  • Weight: 9.4 kg / 20.7 lbs
  • Width: 510mm / 20.1"
  • Height: 240mm / 9.4"
  • Depth: 240mm / 9.4"

Related videos

About the manufacturer

Marshall

Marshall is a legendary British amplifier brand that defined the sound of rock music with its unmistakable power, grit, and presence. Founded by Jim Marshall in London in 1962, the company quickly became synonymous with the roaring tones of the 1960s and 70s, used by icons like Jimi Hendrix, Pete Townshend, and Slash. Known for their iconic “stack” design and warm overdrive, Marshall amps deliver the punchy, dynamic sound that has powered countless stages and recordings. From classic valve amplifiers to modern digital models, Marshall continues to embody the spirit of rock’n’roll—loud, bold, and timeless.

More info about this Product

Amp Heads

An amp head contains the core tone and power of a guitar amplifier without the built-in speakers, allowing you to pair it with the cabinet of your choice. This setup offers greater flexibility over sound and volume, as different speaker cabinets can dramatically change the feel and character of the amp. Amp heads are available in valve, solid-state, and hybrid designs, ranging from low-wattage studio models to high-powered touring rigs. They’re ideal for players who want a modular setup, precise control over their tone, and the ability to adapt their rig to different venues, cabinets, or recording situations.

Amps

Guitar amps cover everything needed to amplify, shape, and project your guitar sound, from small practice setups to full stage and studio rigs. In this category you’ll find combo amps, separate amp heads and speaker cabinets, covering valve, solid-state, and hybrid designs, each offering a different feel and response. You’ll also see modelling and digital amps, built-in effects, footswitches, attenuation solutions, replacement speakers, valves, and essential accessories to keep an amp performing at its best. Whether you’re chasing pristine cleans, classic crunch, or modern high-gain tones, guitar amps and related gear are all about finding the right balance of power, tone, and control for the way you play.

More Gear like this

20W

Products with the 20W tag have an amplifier or power stage whose stated output is 20 watts. Wattage alone does not determine perceived loudness, clean headroom or suitability for a room: speaker efficiency, impedance, cabinet design, amplifier type and how the power is measured also matter. Compare the complete specification and intended practice, recording or performance use.

Amp

An amp is an amplifier used to boost the signal from a guitar and shape its overall tone and volume. It plays a major role in how a guitar sounds, influencing everything from clean clarity to natural overdrive and distortion, and is a core part of any guitar setup for both practice and live performance.

Amp Head

Guitar amp heads contain the main tone-shaping and power section of an amplifier, designed to be paired with a separate speaker cabinet. They let you choose different cabinets to suit your sound and setup, offering flexibility for home, studio or live use. If you want control over volume, tone and character without being tied to a single combo format, amp heads give you a modular way to build the rig that works best for you.

Valve Amp

Related gear