'59 Tweed 15W Amp Kit

'59 Tweed 15W Amp Kit

'59 Tweed 15W Amp Kit

Item # 10731
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2 or more $802.30
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'59 Tweed 15W Amp Kit

About This Item

The dirty little devil that shaped guitar history
With mysteriously fat saturated tone, this little monster makes it easy to achieve seismic distortion.

This amp's 5E3 circuit is an enigma. Why do the controls on the channel you're NOT using make your tone so great? Some say it's caused by defects in the circuit design, others dive deep into the nuances of the engineering ... but at the end of the day whether it was a happy accident or pure genius, this amp is one of the finest examples of vintage tone available anywhere, at any price.

Just listen to Neil Young's Rust Never Sleeps. From the hint of crunch you hear on the opening note of "My My, Hey Hey", to the warm overdrive in "Powderfinger" and finally the gritty dirt in "Hey Hey, My My" you will see exactly what this little tweed amp is capable of … goosebumps.

StewMac has lovingly recreated this timeless amplifier in our '59 Tweed 15W Amp Kit. This is one of our Icon Kits: loving reproductions of vintage classics.

If building such an iconic classic sounds hard, don't worry. We've gone to great lengths to make this kit something a complete beginner can tackle. The '59 Tweed is a perfect place to start. It comes with all the parts you need to complete this project in just a few evenings.

  • The cabinet interiors are genuine 3/4" North American Pine (not plywood), just like the ones made in the Fullerton factory in the 1950s
  • Superior craftsmanship on the tweed covered exteriors with perfectly aligned seams
  • Premium quality hardware
  • Top-shelf 6V6, 12AX7, 12AY7, 5Y3 tubes and vintage spec Heyboer transformers to give your amp the perfect vintage tone
  • High-quality period-authentic resistors, CTS pots, Orange Drop caps, and Switchcraft jacks for their authentic tone and a lifetime of trouble-free use
  • Authentic fiber eyelet boards just like the ones used in the original vintage amps
  • Period-correct pushback wire
  • 12" Jensen speaker – just like the ones used in the originals
  • We created easy step-by-step instructions for each amp kit, breaking down every task into clear, bite-sized pieces. With hundreds of full-color photographs and illustrations, these instructions make this an easy, fun and rewarding project—even for first-time builders.

Need Help? Our trained staff is standing by!
If you get stuck don't worry, we're here to help. Our amp team is just a phone call away.

You don't need a shop full of tools either!
The great thing about these amp kits is they only require a few relatively inexpensive tools.

Amp cabinet dimensions
Height: 16" (40.64cm)
Width: 20" (50.8cm)
Depth: 9-1/2" (24.13cm)

Build and use this amp internationally!
This amp works wherever you are! This amazing amp can be wired for 100, 120, 220, 230, or 240 volts. This means that if you are outside the USA, you can still build this amp without needing an external step-down transformer.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


Product Instructions

'59 Tweed 15W Amp Kit Instructions

The new StewMac '59 Tweed will be a blast to play through and even more fun to build.

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  • 4.67 average rating from 21 reviews
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'59 Tweed


Verified Buyer

Good instructions and well documented.


Great Project!


Verified Buyer

First off, I’m not afraid to date myself, I’ve built many a kit back when Heathkit, Lafayette Radio, Dynaco and others were around. Boy, I wish I had those Dynaco tube amplifiers I built now...they are selling for a fortune. From there, had a career in electronics engineering, and retiring from it, I see this amp kit a joy waiting to be had.

The amp isn’t built yet, I just barely started on it, but so far, let me say this- the packaging of the parts, cabinet, etc is of top quality. The cabinet comes in a foamed in place box of its own, the small parts are supplied in a compartmented box, the speaker in its own factory box (I did get a Jensen, thankfully) and the heavy transformers well packed individually. The shipping boxes are good, sturdy ones.

I ran down the parts inventory check off, all is there in correct quantity and description. The components are of reasonably good quality, I checked all the carbon comp resistors with a good Fluke DVM, they’re well within tolerance. The tube sockets could be a bit better, if it bothers me, I might upgrade them, we shall see. Speaking of tubes, they are good quality, not tip top end, but then again, do I really want that. These JJ units will do just Fine.

The tweed on the cabinet is beautifully applied, the seams and tweed lines are very well done, good job on that!

All in all, my expectations were exceeded so far, the assembly instructions are beyond good, no-one should have trouble with this kit given the quality level of the instructions, and having written many procedures in my medical device days, it is no small task to author an assembly instruction manual. I suppose the FDA regulators would have had some issues if I had written in the humor found in the amplifier instructions!

I’ll write more on a review later when I get into putting together.

For now, if you are thinking of buying this kit, you won’t be disappointed. I’m tinkering with the idea of getting the ‘65 amp after this!


Great sounding and looking amp


Verified Buyer

I have never built an amp before and have only some soldering experience. The instructions were great with detailed pictures. Pretty tight soldering locations, but got them all. Only two issues with the electrical bringup. I had a short in the heater wires, which I found with the ohm meter. Next, when plugging in the first tube and testing. I found I forced it in the wrong orientation. I assumed when the directions said it only went in one way, I could just not look and feel it when it was right. Actually, you can put it in wrong. It blew the fuse. I pulled it out, replaced the fuse and looked at the broken off tab from the tube to orient it correctly. Everything worked then great. I added a master volume control so I could drive the tubes at 10, but keep the volume lower when playing in my house. The amp has a great sound, very gritty when it's turned up.

The only issue with the kit was the speaker mounting bolts on the cabinet were slightly mis-aligned and I had to bend them some to get the speaker installed. So much for ensuring the speaker bolts are tighten equally, but is seems to be OK
Love the amp!


What an amp!


Verified Buyer

I had a great time building this thing. Directions were easy to follow and well organized. First time I turned it on nothing happened (and nothing was smoking...phew!). A bit of trouble shooting revealed a faulty on/off switch. I soldered a jumper on the lugs and used a power bar to power on and off and success! The red light came on and no smoking anywhere. Stew-Mac sent me a replacement switch with no trouble at all. The amp sounds incredible and with a tube screamer in front the tone is creamy and smooth with beautiful harmonics. Well worth the price and fun to build.


Holy Grail Of Amplifiers!


Verified Buyer

Yea ! That's a pretty strong statement, but, these are really nice amps!! I started playing guitar in 1965. My friends and I had Twins, and Deluxes. Somehow we all got suckered into the big, powerful, amps, of the 60's and 70's. Now, I like Marshals, big Carvins, Vox Supers, but in many places, I couldn't use mine. And if I did, I had to turn it down so much that I lost all my Mojo with it. Anyone that's played a tube amp at real low volumes knows what I mean. So I've been playing 5 to 25 Watt amps, since I built my studio, I got my Mojo back. I've got an electrical education so these kits seemed easy to me. First thing is, learn how to solder. It's not hard. A few hours, you got it. Second thing, follow the directions exactly. Stewmac has made a great manual to follow.
Third thing, do not hurry. Check a couple pages ahead, while building, ( I read the manual a couple times before I started ). Get on line and build yourself a dim bulb test unit. I don't have fancy scopes, or variable power supplies, so that's what I use. When I'm ready to smoke test the unit, Everything goes thru the 100watt bulb first. Usually, it doesn't come on. But if it does, you screwed up ! Just do what I do. Check each circuit about 5 times, as I build, and don't continue on until that's done. Then you will have confidence when you energize it. These amps sound great!!
Now, with a little work, you can have a vintage, tube amp, and you don't have to mortgage your house ! I know these kits aren't cheap, but I think they are just as good as the original amps. Compared to the originals, and the re-issues, these are a deal. Next project will be the vintage Marshal !! Have fun building a Legend !


Great Kit for Initial Amp Build


Verified Buyer

Always wanted to own a point-to-point wired tweed amp and this kit looked like the perfect place to start.

Terrific instructions.
The packaging for shipping and the organization of parts is excellent.
All supplied parts are quality components. I was short on the green pull back wire like everyone else, but had enough of the yellow to complete the job.

Note: I would recommend adding an extra inch to the recommended lengths specified for the twisted green "heater" leads. Mine measured out exactly as called for and I found the runs to be very tight fits. If I build another I will add extra and trim back as needed.

Aside from the wire I had only one other issue in building the amp.
The cabinet is very well made, but Mojo's template for positioning the speaker mounting screws must be off. In the first cab I received the two top speaker screws were way off and I had to send for a new cabinet, which Nick at Stew Mac took care of right away. On the second cabinet I still had to use a hollow shaft nut driver to straighten out the mounting screws and force the speaker frame onto them.

After a thorough checkout the amp worked right away and sounds fantastic. Some of my DC voltage levels were a little high. Matt at Stew Mac answered my emailed questions about them within an hour.

Overall I am very happy and wish I had not previously bought a Fender PRRI a year or so ago because I would be building that Stew Mac kit or the DR next !


Great amp kit!


Verified Buyer

I’ve wanted to build a tweed deluxe amp for quite a while. I’ve been nervous to buy one because I don’t have any experience with wiring diagrams or schematics. I stumbled on this website and noticed this kit had step by step instructions. That’s what sealed the deal for me. I bought the kit. When the kit arrived, everything was packaged very well. I put the amp together and to my surprise, it passed all the voltage tests and worked the first time plugging it in. The instructions book was easy to follow and made building this amp an enjoyable experience. The amp sounds amazing. I would recommend this kit to anyone that wants to build an amp. Very happy with this product.


Follow-up to my earlier review (March 16th)


Verified Buyer

I am totally thrilled. I finished up the build several hours ago. I had to take some time off to have a kidney removed due to a bit of cancer in it.) and the amp passed all the final tests well within the acceptable specs. I plugged in my telecaster and did exactly what the instruction book said I "Let her Rip". And the amp can certainly rip. It is totally awesome!

While this was my first attempt at amp building, It couldn't have been a better experience. It turned out to be the perfect project for me during a long recovery period after having major surgery. I was in no rush and I worked on it when I felt up to it. I really agree with the practice of being careful, following the book step by step and constantly double checking your work.

In his review Jim Starr mentioned Mindy Hatcher's Shop in Post Falls ID, (Thanks for the tip Jim!) as a great place to get a vintage style name plate and he was spot on with his suggestion. My amp is certainly a clone of an iconic classic but at least mine has it's own identity to go along with it' rowdy personality.

I did have to contact Stew-Mac a couple of times once to replace an extension speaker jack and again when I came up short on the green wire for the tube heaters. Stew-Mac quickly sent me the right stuff (Thanks Matt!),

The instruction manual is a work of art and if you are a rookie amp builder do yourself a huge favor and follow the instructions exactly as presented and in the order specified and you should be fine. Make it a priority to follow the safety instructions as if your life depends on it. Given the voltages involved it just might! Practice your soldering skills before hand as good soldering ability is a must for this project, The manual has a decent section on soldering and there is plenty of tutorials on the subject on You Tube and elsewhere on-line,

I would definitely recommend this kit to anyone interested in amp building and I am seriously considering building another one. (Stew-Mac's 66 D-Reverb sure looks tempting!)

I am changing my previous rating from four stars to five. This project was a great learning experience, great fun and perfect therapy for someone dealing with a rather serious medical condition. There is a real bright side to all of this; The Doc says I am now cancer free, I have an awesome new amplifier that I can take pride in because I took on the challenge of building it myself and succeeded. How cool is that? Thanks Stew-Mac.


Fun Project, Great Instructions, Great Support


Verified Buyer

First time amp build...no real electronics experience beyond guitar wiring. I was doubtful that I could assemble it without a mistake, but to my surprise it worked first time. The amp is super quiet, and the tone is great...really a fun amp and terrific knowing I built it myself. The tweed cabinet is well assembled and has a great vintage appeal.


The instructions are superb, as others have noted. I quadruple checked everything, and the stewmac instructions made it easier to double check connections. If it weren't for the instructions I don't think it would have worked.

Shipping was quick, arrived in 3 days. Everything was well packed and arrived undamaged.

support was excellent. A couple parts needed replacing, and they were at my door in two days. I had a couple questions, and I got a call back within 3 hours.

The parts were well organized in a compartment tray.

The project took me about 12 hours, but I wasn't rushing.


a few issues with the parts...the kit shipped with 5 shunting jacks instead of 4 shunting and one mono jack. It didn't matter, but I wasn't totally sure until I was able to talk to stewmac support. One of the tube shields was missing an internal spring, and the two 9 pin sockets were both defective...the pins fell out of the front of the socket when you turned it over. Stewmac replaced them with a higher quality Belton socket, which worked excellently.

I needed about a foot more green wire, which stewmac supplied.

Overall, excellent experience. Some tips that I gleaned from this first-time experience:

you can't double check connections often enough. Despite trying to be super careful, my final inspection revealed two unsoldered connections. I couldn't believe I missed it.

Check continuity of behind the board jumpers and ground points several times.

Somewhere online I saw the phrase, "pretend it's broken and you're trying to find the wiring error." I thought this was an good way to sharpen attention.

Another tip is to make a copy of the wiring diagram, and use a highlighter to highlight every component or wire after it is installed. If you're done, and something isn't highlighted, you missed it.

I used this experience to learn about how this amp works, what the components do, how the signal runs through the schematic, and how varying the values of the components can vary the tone. It's easier than you think, and greatly enhances the experience and ability to diagnose problems. c
carefully arranging the wires is key to reducing hum and being able to trace your wiring. There are online resources that explain "lead dress".

Good luck!


A dream come true for a guitar nut


After 55 years of playing guitar I decided to expand my passion to building both guitars and amps. The 59 tweed amp kit was a perfect project. A great way to learn about classic tube amps and end up with an awesome guitar amp for my Fender guitar collection. I admit that my soldering skills were a problem and there were a couple of cold solder connections that caused some grief. Matt at tech support did a good job guiding me, but ultimately a local amp tech had to help me out getting the tricky tube socket connections done right.
This is an excellent amp kit with clear step by step instructions.
Two suggestions: it would be interesting to get more information about what the different components actually do. Also, guitar nuts like myselt are not automatically skilled at the art of soldering. An expanded soldering tutorial would help addressing issues like oxidation of the tip, the use of flux, choice of tip, wattage settings of the iron, etc..

Overall a fabulous and fun experience.

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