Synergy Marshall JCM800 Dual Channel Valve Preamp Module

The Synergy Marshall JCM800 Dual Channel Valve Preamp Module captures the snarling, mid-forward roar of the legendary JCM800 2203 and 2204 heads in a compact, modular format for your Synergy rig. With two fully independent channels, authentic all-valve circuitry and a built-in 0-watt power amp section for real amp feel, it delivers everything from tight classic rock crunch to searing lead tones at any volume.

Designed in collaboration with Marshall, this module faithfully recreates the response and character that made the original JCM800 the backbone of countless rock and metal records. Each channel has its own full set of controls, allowing you to dial in rhythm and lead sounds that feel like two perfectly matched heads sitting side by side. Drop it into your Synergy host and you have instant access to one of the most iconic British amp voices ever made.

At the heart of the module are three 12AX7 valves, with two dedicated to the preamp and one acting as a phase inverter for the integrated 0-watt power amp section. This clever design gives you the punch, sag and touch sensitivity of a cranked head, while letting your chosen Synergy power amp or host unit handle the actual output stage. The result is a rig that feels alive under your fingers, whether you are tracking in the studio or playing live.

Flexible switching options let you fine-tune the response to your guitar and playing style. A three-position bright switch, high/low input voicing and internal cathode select switch provide a wide range of gain and feel variations, from tight, percussive attack to a more open, vintage-style grind. If you want the unmistakable sound of a pushed JCM800 in a modern, modular system, the SYN-MJCM800 module is built for you.

Authentic JCM800 Voice

Voiced around the classic Marshall JCM800 2203 and 2204 circuits, this module delivers the biting upper mids, tight low end and aggressive crunch that defined 80s rock and metal. It responds beautifully to picking dynamics and guitar volume changes, cleaning up when you roll back and roaring when you dig in, just like the original heads.

Dual Identical Channels

With two identical channels, each with its own full control set, you can create complementary rhythm and lead sounds without compromise. Set one channel for a punchy crunch and the other for saturated solos, or keep both similar with different volume levels for effortless gain staging during a set.

Built-in 0-watt Power Amp Feel

The inclusion of a dedicated 12AX7 phase inverter and 0-watt power amp section gives the module a genuine amp-like response before it even hits your Synergy host. You get the feel of a driven output stage, with natural compression and bloom, while still relying on your chosen Synergy chassis for overall power and volume.

Fine-tuned Tone Shaping

A three-position bright switch, high/low input voicing and internal cathode select switch let you tailor the module to different guitars, pickups and playing styles. Whether you need extra cut for humbuckers, a slightly softer response for single coils or a tighter low end for modern riffing, the SYN-MJCM800 can be dialled in to suit.

• Classic JCM800 2203 / 2204 Voicing - Based on the legendary Marshall JCM800 2203 and 2204 circuits, this module nails the aggressive British crunch and singing lead tones that have powered countless rock and metal records, giving you studio and stage ready sounds straight out of the box.
• Two Fully Independent Channels - Each channel has its own gain, EQ, presence and volume controls, so you can set up distinct rhythm and lead sounds without compromise, effectively giving you two JCM800 style preamps in a single module.
• Three 12AX7 Valves with 0-watt Power Amp - With three 12AX7 valves on board, including one dedicated to a built-in 0-watt power amp / phase inverter, the module delivers genuine valve feel, touch sensitivity and dynamic response before it even reaches your Synergy power section.
• Flexible Voicing and Switching - A three-position bright switch, high/low input switch and internal three-position cathode select let you fine-tune the gain structure, attack and overall character, making it easy to adapt the JCM800 sound to different guitars, tunings and musical styles.

General

• Product: Synergy Marshall JCM800 Dual Channel Valve Preamp Module
• Model: SYN-MJCM800
• Type: Modular valve preamp module
• Format: Synergy module

Channels

• Number of Channels: 2
• Channel Configuration: 2 identical channels
• Channel Controls: Independent controls per channel

Controls (per Channel)

• Preamp (Gain)
• Bass
• Middle
• Treble
• Presence
• Volume
• Independent Master Volume

Valves

• Valve Types: 3 x 12AX7
• Preamp Valves: 2 x 12AX7
• Power Amp / Phase Inverter: 1 x 12AX7 (0-watt power amp section)

Voicing and Switching

• Voicing: Based on Marshall JCM800 2203 / 2204 circuits
• Bright Switch: 3-position
• High / Low Input Switch: Lead / Normal
• Cathode Select: 3-position internal switch

Power Section

• Built-in 0-watt power amp for amp-like feel and response

Effects and Routing

• Effects Handling: Depends on Synergy host unit
• Module Function: Preamp only

Compatibility

• Synergy SYN-1
• Synergy SYN-2
• Synergy SYN-20IR
• Synergy SYN-30
• Synergy SYN-50