MARSHALL JCM 800
Few amplifiers have achieved the near mythic status of the Marshall JCM 800. When it first roared to life in the early 1980s, it did not just define an era it ignited it. Kicking off a new generation of tones, the JCM 800 became the definitive voice of hard rock and heavy metal. Big, aggressive, and unmistakably British. It took the foundational crunch of the Plexi and added the gain, punch, and focus that powered a generation of guitar heroes.
Marshall JCM 800 2203 100W and 2204 50W circuits, with their single channel, cascaded gain stages, and signature midrange roar, delivered a level of authority and articulation that set them apart from anything before or since. It was the perfect balance of power and precision. For countless players, the JCM 800 is not just an amplifier it is the amplifier.
Now, Synergy and Marshall have teamed up once again to bring you, for the first time ever, this legend in a three tube, dual channel preamp module. Utilizing Marshall’s original circuit design, the JCM 800 module delivers the raw energy, attack, and articulate overdrive of the iconic vertical input 2203 and 2204 amplifiers. Whether you are chasing the three dimensional crunch of 80s rock or crushing tight gain for modern metal, the JCM 800 module gives you the legendary tonal experience that defined a generation.
DUAL CHANNEL THREE TUBE PREAMP
Each of the JCM 800’s two identical channels feature independent Preamp, Bass, Middle, Treble, Presence, and Volume controls, giving you complete command over your gain structure and tonal response. From dynamic low gain crunch to saturated high gain sustain, the JCM 800 module delivers every nuance of the original amp’s voice. Independent Master Volume controls for each channel allow you to precisely balance rhythm and lead levels with all of the amp’s dynamic character and harmonic complexity.
THREE TUBE MODULE WITH BUILT IN 0 WATT POWER AMP
The JCM 800 module introduces Synergy’s three tube architecture in modular preamp design.
Beloved by generations of players, the original JCM 800 truly came alive when cranked, thanks to the interplay between its preamp and power amp stages. Synergy has now captured that same raw energy and unmistakable feel in a compact, modular form. Two 12AX7s drive the preamp, while a third 12AX7 powers the built in 0 watt amplifier and phase inverter. With the JCM 800 module you get the sag, feel, and harmonic bloom of a fully cranked JCM 800 head at any volume.
The JCM 800 module delivers the authority, grit, and edge that made this amp an icon in rock history, while propelling Synergy’s modular platform into new sonic territory.
BRIGHT AND HIGH LOW INPUT SWITCHES
Expanding on the original amp design, the JCM 800 module provides additional flexibility with two key features
Bright Switch
A three position toggle switch selects between two bright cap values or removes it entirely. This lets you tailor the attack and clarity of the preamp stage from tight and biting to warm and smooth. It is similar to modifying the bright cap on a vintage 2203.
High Low Input Switch
Replicates the dual input jacks found on the original JCM 800, toggling between the high gain Lead input and the lower gain Normal input. This lets you move from punchy classic crunch to saturated modern drive.
CATHODE SELECT FUNCTION
The Marshall JCM 800 module features a three position switch on the PCB, which allows you to configure the input tube bass response to match the original circuit of the selected module. These settings affect the feel and tightness. Each amp designer has a specific combination of components that make up their input tube circuit. Three combinations are available with this switch
Position 1 1.5K resistor and 22uF capacitor
Position 2 2.7K resistor and .68uF capacitor
Position 3 1.8K resistor and 1uF capacitor
The JCM 800 module is preset to the center position 2.7K resistor and .68uF capacitor.
Synergy hardware and interchangeable preamps are protected under US patent.
The JCM800 module will only work in SYNERGY hosts SYN 1 SYN 2 SYN 20IR SYN 30 SYN 50
IT WILL NOT WORK IN ANY OTHER HARDWARE FROM OTHER MANUFACTURERS
MARSHALL THREE TUBE MODULE FEATURES
• Authentic three tube preamp based on the Marshall JCM 800 2203 and 2204 vertical input
• 3 x 12AX7 preamp tubes for full harmonic complexity and dynamic response
• Built in 0 watt power amp and phase inverter for amp like feel
• Two identical channels each with Preamp Bass Middle Treble Presence
• Independent Master Volumes for rhythm and lead
• Bright switch three position adjusts bright cap value for tone shaping
• High Low Input switch replicates original JCM 800 input behavior
• Cathode Select switch on PCB for adjustable tube response
• Easy to install and remove from Synergy preamp docks
