Tweed Bassman® 5F6-A Style Combo Amp Kit

4 Reviews
$442.98 to $1,025.00
SKU: G1TWK942
Sale Unit: Piece

On Back Order

Kit Build Difficulty:
 
Easy
 
Difficult

This kit has a lead time.  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.


Mojotone’s Tweed Bassman Style Amp is based on the late 50s 5F6-A circuit. These 40 Watt amps are known for their bold and pristine clean sound as well as their classic unmistakeable dirt. The Bassman® is extremely versatile and has been used by tons of iconic guitarists from Mike McCready, of Pearl Jam fame, all the way to Stevie Ray Vaughan himself.


  • Class Type:AB All Tube Amplifier
  • Output:~40 Watts
  • Circuit:5F6-A
  • Bias Type:Fixed Biased 
  • Build Time:~6 hours
  • Preamp Tubes:JJ ECC83/12AX7 (2), JJ 12AY7 (1)
  • Output Tube(s):JJ 6L6GC (2)
  • Rectifier Tube:JJ 5AR4 / GZ34
  • Transformers:Power - Bassman Power (MOJO752EX), Output - Bassman (MOJO764), Choke - (MOJO777)
  • Speakers:Jensen C10Q 10" 8 ohm Speakers (4)
  • Cabinet:Tweed Bassman 4x10 Combo Cabinet
  • Hardware:Tweed Bassman Small Parts Kit, Tweed Bassman Chassis, Tweed Cap Pan, 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 tech@mojotone.com 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 tech@mojotone.com. 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:

Mojotone Tweed Bassman Schematic
Mojotone Tweed Bassman Wiring Diagram

Click HERE to view an image of this chassis completed in accordance with the schematic provided above.

Ratings & Reviews

4 reviews

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2/17/2021 1:42 pm

G1TWK942

by anonymous

I recently built the Bassman Tweed kit and it is fabulous. Everyone who

has heard this amp is blown away. Everything about this kit is absolutely

first rate -- the cabinet, chassis, components, etc. I couldn't be happier!

2/17/2021 1:42 pm

G1TWK942

by anonymous

I finished building my 5f6-a a few days ago. Since then, if I haven't

been playing it I've been thinking about playing it! The tone is gorgeous. Customer service was quick to respond and very professional. Thanks Mojotone this ones a keeper.

2/17/2021 1:42 pm

G1TWK942

by anonymous

The 5F6-A Bassman's rep as one of the best amplifier designs ever made is well deserved. Try as I might to find its shortcomings, as I can with so many other Fender and other designs, I just can't. It's perfect. The perfect design and the perfect sound. While perhaps being too large and loud to get over drive at reasonable volume, the overdrive is pure rock nirvana and the cleans a spanky clear.



Mojo does the amp justice. Correct parts, all of high quality, including correct transformers. I dare say this is their best kit.



Now strap on your techno-geek helmets because I'm about to nerd out (just picture me pushing my taped horned rims up on my nose as I say this to you) but - the Bassman can be man different amps. First there was the 5F6 - notable mostly because it had a second gain stage (basically a 25uf cap which you will see is deleted on the 5F6-A layout). This cap adds mondo gain. It's a simple swap - so add one to your order.



Most importantly - this kit is supplied with Audio Taper pots. The Bassman only used an audio taper on the bass control - the rest had the faster taper of a Linear Pot. This is not a subtle point. It's night and day - add some Alpha Linear pots to your order as well.



Now the 5F6-A as drawn on the layout is said almost not to exist in real life - or if so few examples have ever surfaced. As drawn you will have a mid heavy amp that is very much in the Hendrix vein. It should be because Marshall copied this circuit as we all know.



Most 5F6-A Bassman had a different middle and bass cap value (.02 and .1 respectively) as well as a 100K slope Resistor. As well as a 6.8K tail Resistor to replace the 10K on the negative feedback loop (will increase gain slightly). The Presence control also used a 25K linear pot and a 4.7K Resistor to ground (this is not that important a change I don't think).



I will leave it to you as to determine where these parts go but I will tell you, should you want to hear the different voices the Bassman had to offer, historically - it gives you the option of deciding which you like best as well as gives you the chance to mix things up now and then when the mood strikes.



All in all a great quality kit from Mojo. They always stand behind their products and are always interested in how to improve them. No affiliation - just a happy customer.



Now back to playing my Mojo Bassman! Just had to pause to write how great it is.

2/17/2021 1:42 pm

G1TWK942

by anonymous

I bought the amp built by Mojo. Build quality was first rate. The amp fired right up and sounds glorious. Great amp. As good or better than any other amp of this type that I've tried and I've tried quite a few. I highly recommend it.