British Style 800 2204 Guitar Tube Amp Kit


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SKU: G1800969
Weight: 25.89 lb
Sale Unit: Piece

In Stock


Amp Kit Difficulty Level


If this kit shows as out of stock please check here for more information.

Please read our article 'Mojotone Amp Kit Building Primer' along with our amp kit disclaimer located in the Specs tab before buying this kit.

This kit produces similar tones to a 81-90 Marshall® JCM800 2204.
  • Class Type:AB All Tube Amplifier
  • Output:~50 Watts
  • Circuit:2204
  • Bias Type:Fixed Bias with an adjustable potentiometer
  • Build Time:~7 hours
  • Preamp Tubes: ECC83/12AX7 (3)
  • Output Tube(s): EL34 (2)
  • Rectifier Tube:None - Solid-State Rectified
  • Transformers:Power - Plexi / 800 50W (7020850), Output - Plexi /800 50W (7021850), Choke - Plexi / 800 Choke (7022800)
  • Hardware:British 800 Small Parts Kit, British 800 Chassis, Front & Rear Faceplates, 10' Removable Power Cord

Disclaimer: Some of the parts contained in this kit are subject to availability.

Mojotone reserves the right to change or substitute any and all of the parts contained in this amplifier kit without advertisement or notification to the buyer. Part substitutions made by Mojotone are guaranteed not to affect the integrity or operation of your amplifier kit. Time estimates listed are from start to finish. If you are new to tube amplifiers, additional time may need to be factored.


When purchasing a kit from Mojotone, you will receive the following documentation.

1. Schematic

2. Wiring Diagram / Layout

Our beginner level kits such as the tweed champ and tweed deluxe include a manual. If you purchase a kit from Mojotone and do not receive these documents, you can obtain copies by emailing or calling 800-927-6656. The Mojotone staff is available Monday through Friday from 8:30 a.m. to 5:00 p.m. EST unless otherwise closed.


Mojotone kits include the best quality parts that are available at the time of purchase. If a substitution is required, our team will use parts that are of equal quality to ensure the integrity of the kit build remains the same.


Building a fully functional amplifier kit is not an easy task. Before building a kit, one should have the ability to properly solder as well as read and understand a schematic and wiring diagram. While we do our very best to ensure all documentation is current, the included documentation is meant to serve as an overall guide to building the amplifier. Simply following the schematic and wiring diagram does not guarantee you will have a fully functional amplifier. In fact, post build troubleshooting is a common issue across all builds.


Our staff is available to assist with basic troubleshooting needs. There are plenty of online videos available that are helpful with most post build issues. Technical staff is available via email by sending a message to You may also call our sales team to discuss build problems, dial 800-927-6656 and press 1 for sales.


Building a tube amplifier takes time, dedication, resources and most importantly... Skills! The experience of building an amp can come with some frustration, the reward of completing the build is definitely well worth your time. Please review the wiring diagram, schematic and manual (if applicable) prior to making your purchase. Mojotone will not accept any returns on amplifier kits and/or parts that have been assembled, soldered or modified.

This amp kit also comes with the following documents. Please feel free to view and/or download them:

British 800 Schematic
British 800 Wiring Diagram

Ratings & Reviews

2 reviews

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7/4/2023 1:52 pm

JCM800 tone in spades!

by JR -

This is my second Mojotone kit build and another reason to recommend Mojotone for their quality, customer support and accuracy in emulating the sound of another classic amp circuit!

Build the circuit per the instructions and you will have the iconic tones of the JCM800 2204 of old. Everything from the quality and specifications of the components, trannies, etc is all there similar to the original.

Of course this circuit is also a great platform for mods so I implemented a few and the way I implemented them with switches, the amp can be returned to stock form easily with the flick of a few switches. My favorite mods are a built in attenuator that switches the amp between 5 or 50 watts…perfect for bedroom playing! Also did the popular EVH “fat” mod, a raw switch that bypasses the TMB tone stack, and a resonance pot…all on switches that can be bypassed to “stock”.

Highly recommended, loads of fun to build, play….and mod!!

5/4/2023 8:45 pm

This is a great stem project, just be careful with the voltages...

by Timothy -

I bought this kit for my 13 year old for Christmas 2022 as a STEM project. He got it done! (Not without a few bugs, but he got it done!) He just followed the drawing supplied and the only thing that had to be reversed were the OT wires to get the negative feedback we needed to get the amp sounding the way it should. I did the initial power up and testing because of the dangerous voltages inside the amp. Outside of this, My son built this amp and the amp works great! (It's not an easy feat, but not impossible for a first time amp build as long as you can follow the drawing and you are able to understand basic theory about amps.) Mojotone has been very helpful with the few times we needed support and I can't thank them enough! Their support is SECOND TO NONE~! I have a feeling we will be building more of these amps!