Mojotone GA-5 Style Guitar Tube Amp Kit


Cabinet and Speaker Sold Separately (Add Below)
SKU: G1GA5951
Weight: 9.6 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.


Originally produced from 1954-1956 the GA-5 was often called Gibson’s answer to Fender’s 5C1- Wide Panel Tweed Champ. Both the Champ and the GA-5 used a 6SJ7, 6V6 and 5Y3 tube compliment and shared a very similar schematic and part assortment. Often over looked and undervalued, the GA-5 is a fantastic recording amp that loves to be pushed and also makes a great living room amp that puts out a warm clean tone at lower volumes.


Mojotone brings the GA-5 circuit back to life with the Mojotone GA-5 Style Kit. Featuring a classic TV Front cabinet, vintage inspired circuit now using a 6V6, 12AX7 and 5Y3 tube compliment – this unsung classic is the perfect amp kit to get you started on your amp building journey.

  • Class Type: A All Tube Amplifier
  • Output:~5 Watts
  • Circuit:GA5
  • Bias Type: Cathode Biased
  • Build Time:~4 hours
  • Preamp Tubes: ECC83S/12AX7 (1)
  • Output Tube(s): 6V6GT (1)
  • Rectifier Tube: 5Y3 (1)
  • Transformers: Power - Tweed Champ (MOJO759), Output - Champ (MOJO771)
  • Hardware:GA-5 Small Parts Kit, GA-5 Chassis, 10' Install 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:

GA-5 Schematic
GA-5 Wiring Diagram

We no longer send the instruction manual with the kit, but you can still view it here:

GA-5 Instruction Manual

Ratings & Reviews

2 reviews

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews
10/23/2023 1:16 pm

Great amp! Fun build.

by Joe Paulsen -

I had been looking for a simpler amp build after a fender tweed I built and this was perfect. Point to point is great to help you understand the schematics. I would highly recommend getting the amp chassis stand as well because it really helps you get in on some of the odd angles the chassis has. Goes from quiet and jangly to aggressive with the intensity of your picking. Plenty loud for 5 watts. Mojotone support was awesome as well.

4/22/2022 2:44 pm

Awesome Amp

by David Orr -

I love this amp. I didn't know 5 watts could sound so good. I bought this kit through reverb and forgot my password so when the 12ax7 was bad out of the box I wasn't able to get a replacement but I had one out of a hammond organ. I got a lesson in troubleshooting and checking my work but that bad tube was very valuable in teaching opportunity. Very sweet sounding amp.