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.
We offer a completely hand-wired GA-5 style amp assembled by our expert builders right here at Mojotone headquarters. Our in-house technicians have an extreme attention to detail and take great pride in their work -- our builds are 100% guaranteed.
For those players who are a little more "hands-on," we also offer the amplifier as a kit with a variety of options including small parts only, full kit, export specs, and more.
This amp kit also comes with the following documents. Please feel free to view and/or download them:
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 effect 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.
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.
Name: Jeff Rating: 5
null I wanted a true point-to-point amp, so this was a good choice. I was pleased with the entire process, from unpacking the the amp to the finished product. The four-hour estimate is accurate - it was easy to complete the amp in one afternoon.
Every step of the way was straightforward, thanks to the thorough and organized parts inventory, manual, and wiring diagram. Mine came with two wiring diagrams, so I finally opted for the latest revision, which was a minor change to the power transformer primary.
I would have preferred to have the option to purchase without the supplied tubes. For this build, NOS US-made tubes were the choice. The final result is an incredibly rich tone machine that responds well to playing dynamics and produces a range tone and volume that belies its diminutive size.
If you're on the fence about this as a first-time build, or for an an experienced tech who wants a quality alternative to the tweed amps of the same era, I'd recommend this little gem in a heartbeat. Mojotone hit it out of the park with this kit.
Name: David Rating: 5
Sweet little Amp. This took about 4 legitimate hours to build (the rest of the time was spent fixing my own mistakes when I miswired something), and works great. It sounds a lot larger and much less boxy than I was expecting, and is surprisingly loud, with very little noise.
My kit came with a Celestion Eight 15. It does have an 8 ohm tap available if you'd like to try different speakers. Would love to see this in a Head-only version with a matching 12" speaker box available.
Cabinet is well constructed, chassis was cut and labeled well, and I would definitely recommend. The one very-minor difficulty was that the tilted face makes it a little tight to wire the inputs and volume knob (which is still easier than wiring up the pre-amp socket - I need a smaller tip on my soldering iron). Overall, a very fun build and a great way to spend an afternoon or a couple evenings.
Name: Bob Rating: 5
null Awesome little amp. This is the 3rd Mojotone amp kit I built. Previous kits were the Fender deluxe reverb, Marshall 18 watt TMB. Leave it to me, I went from some of the more difficult to one of the easiest builds. This was lot of fun and a good beginners built with a great sound. If your thinking of trying a build this is a good 1st choice.
Name: Adam Rating: 4
Very Good Built this in November. The great instruction manual made my first amp build easy. I liked the amp but always felt like it had a little something missing. I recently built a speaker cab with an 8 ohm 12 inch Eminence Legend, and I ran the amp (after changing output transformer taps) into that. Now it's absolutely fantastic. The amp has a very bluesy, vintage sound to it, and it handles pedals well. Overall a good amp that was easy to build.
Name: Ben Rating: 5
null OMG! This experience is so good. I have only built one other amp, a 5F1 kit with a PCB, so definitely a beginner. While it was fun, I really couldn’t understand the interaction between the components, so I found myself just following directions and hoping for a good outcome. Enter the GA5 point-to-point kit. Holy crap! I can follow the schematics, understand how everything interacts, and even consider future mods (with a little research)... a totally immersive experience if you want to approach it that way. I feel I’m really getting a good understanding of amp building as opposed to just executing a plan. A really cool addition to the manual would be a discussion of some of the more common mods, and the impact of replacing certain components with others. Excellent kit Mojotone!
Name: BCP Rating: 5
Great little amp I have built plenty of hand wired amps but this was my first point-to-point amp and it is a fantastic little beast. The amp is free of hum and has great cleans when volume set before noon. I originally built it to spec but wanted more headroom so I added more negative feedback and lowered the cathode and plate resistors somewhere between a Champ and a GA-5. Love it through my Tele and a 2x10 cabinet with some reverb.
I hope Mojotone offers some more p2p amp kits so much fun to build and sound fantastic.
Name: Eric Nilsen Rating: 4
Guitar Engineer I love this amp. It sounds so good. Such low noise from direct input, even when dimed, Handles a Tube Screamer like a ... champ?
I got this as a complete kit. ALMOST complete! The problem was with a pre-packaged 1/4" jack for the speaker connection, which was missing a screw and both nuts for the backplate. It was pre-packaged, so I don't blame Mojo for missing that one. Also, the amount of wire provided was a liiitle short to make all the colors perfectly consistent with the wiring diagram; however, there was plenty of wire to make it work.
Speaking of which, the wiring diagram provided is phenomenally helpful. Large and full-color, I followed it closely. I would have like to have seen the schematic included on paper, but it is on the website, and so I just printed it out myself. The instruction manual could probably use an update with troubleshooting tips, (like: "you need to plug your speaker in using the jack plug--bypassing it with alligator clips won't work"), but it got me across the finish line, ultimately.
Everything arrived in great condition. All of the resistors and capacitors were within tolerances. The transformers were steady. The tubes were brand new. The cabinet was pristine. The speaker was perfect. The labels printed on the face of the chassis are simple and cheap, but correct and it works.
I had a lot of fun building, and I will definitely come back for components to my Bassman! Big thanks to Mojo for making this kind of stuff available.