Synergy Marshall JCM 800 Preamp Module

Description

From Synergy:

MARSHALL JCM 800 DUAL CHANNEL THREE-TUBE SYNERGY PREAMP MODULE

Few amplifiers have achieved the near mythic status of the Marshall JCM 800. When it first roared to life in the early 1980s, it didn’t 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 isn’t 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 2203/2204 amplifiers. Whether you’re 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 POWERAMP – A SYNERGY FIRST

The JCM 800 module introduces Synergy’s revolutionary three-tube architecture – a first in modular preamp design.

Beloved by generations of players, the original JCM 800 truly came alive when cranked, thanks to the magical 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 bold new sonic territory.

BRIGHT & 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’s just like modding the bright cap on a vintage 2203, without touching a soldering iron.
High/Low Input Switch: Faithfully 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 instantly 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. We have selected the three most popular combinations which

you can access with this switch: position 1 (1.5K resistor and 22uf capacitor), position 2 (2.7K

resistor and .68uf capacitor) and position 3 (1.8K resistor and 1uf capacitor). Of course, you can

experiment and try any position to see which you prefer. 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 legendary Marshall JCM 800 (2203 / 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 true amp-like feel
Two identical channels, each with: Preamp, Bass, Middle, Treble, Presence
Independent Master Volumes for rhythm/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

Shipping & Returns

Free Shipping

Most orders over $99.00 ship for free inside the lower 48 states. Certain items that are large and heavy do not qualify for free shipping.

We Ship Worldwide!

For information on International Shipping, please call, email or use live chat for rates. Orders shipping outside the Lower 48 States to Hawaii, Alaska, Puerto Rico and international orders do not qualify for free shipping. Orders shipping to U.S. Military APO/FPO addresses, PO Boxes, and US territories (Guam, Virgin Islands, etc.) can only ship USPS. NOTE: Boxes over 70 lbs each cannot be shipped to these locations.

As a security precaution, orders over $200.00 will only ship to the address your credit card company has on file for you.

*Korg and Mesa/Boogie products are only available for shipment within the USA.

Returns

We want you to be completely happy with your purchase, so we offer a 48 hour approval period on most purchases (see exclusions below). The 48 hour approval period begins when your purchased item is delivered to your door. If after 48 hours you’re not happy with the item, just contact us via phone, email or live chat on our website to arrange for a return authorization (RA#) and return shipping instructions. Any package sent back without prior authorization will be refused.

Returns must be shipped back to us within two days of the RA being issued. Items must come back to us undamaged and in the same condition they were shipped out. All manuals, paperwork, cables, tremolo arms, wrenches, etc… must be included or full credit will not be issued. Any items not conforming to this policy will be subject (at our discretion) to a restocking fee of 20% of the purchase price.

Refunds will be issued minus all related shipping expenses, if free shipping was initially given, the cost we incurred to get the item to you will be deducted from your refund. A 10% restock fee will also be deducted from your refund. Restock fees will be waived for full value exchanges.

Here are exceptions to our return policy.

Custom orders of any kind are non returnable and non refundable. We often charge a deposit before we will place a custom or special order. All special order deposits are NON REFUNDABLE, no exceptions.
Microphones, Harmonicas, In-Ear Systems and any other items that come into contact with your mouth or ears.
Items labeled as BLOWOUT, are non-returnable. These are often being sold below cost and are considered “all sales final”.
Software (this may also include hardware that includes software), unless still in shrink wrap with barcode affixed.
Guitar strings, blank media, and other disposable merchandise.
Guitar or bass pickups that have been installed or used in any way.
Any item advertised as “USED” is non returnable.

*Payments for music lessons are non refundable, no exceptions.

View our detailed Return Policy here.

Early Order Cancellation

All deposits are non refundable. Lots of our products are special orders and in many cases your order has to be built for you at the factory. This is what makes a lot of our products special. Once your order is started, it's being put together just for you. For this reason we ask that you don't cancel your order after you place it with us. If for some reason you absolutely have to cancel your order with us, we will assess you a 25% cancellation charge. This amount is equal to 25% of your total order amount. Ask us before you place your order to see if what you're purchasing is considered a special order.

Damaged Merchandise

Do not accept your shipment if the package shows any signs of external damage. After the item is returned to us we will ship you a replacement. If you receive incorrect or defective merchandise, please call 781-335-0700 within 5 days for a return authorization number.