Marshall JCM800 Synergy Preamp Module set against a dark gray background.
Close up of a Synergy guitar amplifier head with Marshall JCM800 Synergy Preamp Module.
Close-up of an electronic circuit board of Marshall JCM800 Synergy Preamp Module.
Close-up of a circuit board of the Marshall JCM800 Synergy Preamp Module.
Marshall JCM800 Synergy Preamp Module sits on a workbench, showing various control knobs and input jacks.
Aclose up of the Marshall JCM800 Synergy Preamp Module electronic components.
Front view of the Marshall JCM800 Synergy Preamp Module.
A close-up of a Marshall JCM800 Synergy Preamp Module on a wooden table in a recording studio.

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Marshall JCM800 Synergy Preamp Module

Dual-channel JCM800 three-tube preamp module with classic 80s crunch and soaring lead gain.
Details

Capture the legendary Marshall JCM800 sound with this dual-channel, three-tube Synergy module - authentic 1980s British crunch, soaring lead tones, and true 800 tone at any volume. Designed and engineered in USA. Made in USA.

Features
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Three-tube Modular Format: The Marshal JCM 800 module introduces Synergy’s revolutionary three-tube architecture - a first in modular preamp design.

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Iconic 80s British Crunch: Recreates the aggressive, harmonically rich tone of the legendary Marshall JCM800—solid lows, upper-mid punch, and searing gain.

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Dual Independent Channels: Separate rhythm and lead channels expand on the classic 800 single-channel design for modern flexibility.

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Classic/Hot Voicing Switches: Choose authentic stock JCM800 crunch or a hotter, higher-gain mode inspired by the modded 800 tones of the era.

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Onboard Phase Inverter (0-Watt Power Amp): Real tube sag, harmonics, and dynamics at any volume using Synergy’s unique mini power amp section.

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Synergy Modular Compatibility: Installs seamlessly into Synergy preamp docks for a versatile, expandable all-tube rig.

CONTROLS AND CONNECTIVITY
Wired connectivity
¼” Instrument cable
Controls
Gain, Bass, Middle, Treble, Master (per channel), Bright Switch (per channel), High / Low Input Switch (per channel), 0-Watt Power Amp/Phase Inverter circuitry
COMPATIBLE APPS
Apps
Synergy Editor Software if used with SYN20-IR
PHYSICAL UNIT
Width
177.8 mm / 7”
Height
38.1 mm / 1.5”
Depth
139.7 mm / 5.5”
Water Resistance
No
Country of origin
Designed and engineered in USA. Made in USA.
INCLUDED IN THE BOX
Box Contents
Preamp Module Warranty Card Quick start guide Legal and Safety Information
Support & more information

Colour

Black

Marshall JCM800 Synergy Preamp Module

£399.99

Regular Price: £399.99

Free Delivery

4-5 business days

Returns, warranty & payment

JCM800 Dual-Channel Three-Tube Preamp Module for 80s Crunch

Experience the unmistakable JCM800 tone. Classic 80s British crunch and searing leads recreated in a modular all-tube platform with Synergy Amps.

A Synergy guitar amplifier head with a Marshall JCM 800 preamp module installed, sitting on a blue surface in an indoor setting.

Three-Tube Modular Format

For the very first time, Synergy introduces its advanced three-tube module architecture. This design provides deeper saturation, greater clarity, and a more authentic modular take on the JCM800 tone.

For the very first time, Synergy introduces its advanced three-tube module architecture.

Iconic 80s British Crunch

Recreates the legendary Marshall JCM800 tone - aggressive midrange, tight punch, and classic 80s overdrive using genuine 12AX7 tubes.

A Synergy amplifier with Marshall JCM800 Synergy Preamp Module sits on a table with cables plugged in; a person in the background plays an electric guitar.

Dual Independent Channels

Two identical, separate channels expand the original JCM800 design—change between rhythm and lead tones instantly.

High / Low Input Switch

Switch between the classic low-input JCM800 crunch and the high-input mode for increased gain, sustain, and aggressive 80s-style harmonic intensity.

Close up of a Marshall JCM800 Synergy Preamp Module.

Onboard Phase Inverter with 0-Watt Power Amp

Built-in phase inverter and mini transformer deliver the feel of a cranked JCM800 at any volume.

Close-up view of a Marshall JCM800 Synergy Preamp Module circuit board.

Synergy Modular System Compatibility

Works with all Synergy preamp docks and modular amp setups for a flexible, expandable all-tube rig.

A Synergy guitar amplifier head is positioned in front of a Marshall amp cabinet, showing various control knobs and input jacks.

Product details

Dimensions

Height: 38.1 mm; width: 177.8 mm; depth: 139.7 mm

Height: 1.5”; width: 7”; depth: 5.5”

Water resistance

No

Wired connectivity

¼” Instrument cable

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