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'59 Tweed 15W Amp Kit

'59 Tweed 15W Amp Kit

'59 Tweed 15W Amp Kit

Item # 10731
Due 2-3 weeks
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$125 OFF SALE

$936.34
$811.34


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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.



CALIFORNIA PROPOSITION 65 WARNING
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


Video

Instructions

Product Instructions

How to relic a tweed amp

A step-by-step guide for creating that "broken-in" look for your new amp kit.

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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4.5
  • 4.69 average rating from 29 reviews
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5.0

Great, and excellent for new builders

By

Verified Buyer


I've built almost all the amps SewMac sells, and this kit has two important things going for it;
- This is probably the easiest amp to build, even easier than the mini-tweed because you have a bit more space in the chassis and the board is simpler. I strongly recommend for first time builders.
- The tone on this amp is really good, I classify it as "sweet", it's got a very gentle character, richness without particular idiosyncrasies. And gets loud enough for some unmic'ed gigging.

A good buy

4.0

Great kit, but a few issues

By

Verified Buyer


I bought this kit as a Christmas vacation project. Ultimately, the amp sounds amazing, I learned a lot, I had a lot of fun building it, and I look forward to more builds and mods in the future. However, there were a couple of issues. The bolts the speaker mounts to are long and were quite difficult to line up to the holes on the speaker since they weren’t perfectly straight. It also makes it a lot harder to bolt on the nuts. Mounting the speaker was by far the most frustrating part of the build for me. It sounds great, but I still plan to upgrade the speaker and I’m not looking forward to the install. I also added lock washers to the input jacks (not included) like the potentiometers, which will keep them nice and secure. One other issue was that my kit didn’t include the heat shrink tubing needed for the spare wires on the power transformer. All that said, everything else went smoothly, I love my amp, and I look forward to modifying it over time. I hope to build another stewmac amp in the future!

5.0

Fun project and worth the effort

By

Verified Buyer


The instructions are truly amazing, so detailed and easy to follow. I had no issues what so ever. I really enjoyed building this amp and didn't expect to complete it so quickly and then have it work perfectly on the first power up. I put a lot of effort into setting up my work area and getting all the right tools together while I was waiting for the kit to arrive. I built a chassis stand that bolts to my work bench, which I highly recommend doing. My stand can rotate the chassis 360 degrees and holds it very stable, which is extremely helpful when trying to bolt in all the tube sockets, jacks, pots, etc.. I am slow and methodical and it took me about 16 hours to build the kit and test it over 5 evenings after work. I even measured each resistor with the meter just to double check before I installed them. The quality of this kit is very impressive. I think it's worth the price for what you get in the end. The amp sounds really nice and adds a tonal quality to my collection that my silver face princeton reverb and modified blackface bassman don't have. It sounds best with my home made telecaster with Seymour hot rails in the neck and bridge.

Advice:
1. Make sure you have small enough cutters for trimming the component leads, mine were a little too big.
2. Buy a solder sucker if you don't have one. I only needed ti use it once but I was glad to have it.
3. Don't work too long, take breaks. The instructions are good at suggesting when to stop, I only worked about 2 hours at a time.

5.0

Awesome Kit

By

Verified Buyer


Very fast shipping, I received it in Switzerland (Geneva) 10 days after my order.
The manual was very well explained, it took me one week at my own paste to built it, very easy to do it.
It worked right away after building it !
Awesome amp kit
Great components.
Thank you Stewmac!

5.0

An excellent kit, and an excellent amp!

By

Verified Buyer


I was really impressed with the quality of this kit--the cabinet, the components, the instructions, and the support are all top tier. Although not inexpensive, I found it to be well worth the price. This was my first amp build, and it took me a solid weekend to do the majority of the work. I felt very comfortable with the level of instruction at every step in the included manual. I had one question at the final testing stage, and StewMac's support team got back to me quickly with a thorough and informed answer.

The only issues I had were minor, and similar to issues mentioned by other reviewers:
1) The speaker mounting bolts on the cabinet weren't perfectly aligned/straight, so it took some real pressure to get the speaker to seat properly against the baffle. It ultimately worked fine, but it's a little disconcerting to be muscling the speaker around like that in one of the first steps of the build.
2) The recommendations for how much green wire to use for the AC heater jumpers (steps 80-84) are a little short, depending on exactly how tightly you twist the wires. I initially wasn't able to reach the tube socket pins on V3, V2, and V1 until I unwound the wires and rewound them more loosely, and even then it was close (I broke one of the preamp socket pins trying to get it to work, and had to replace the socket). This part of the build would be much easier if the kit included another foot or so of green wire, and added at least another inch to all of the recommended green jumper lengths.

Ideally, those two minor quibbles would be addressed, but even as-is, I would recommend this kit to anyone who wants to learn about amplifer circuit design (or anyone who just wants to follow the instructions blindly and have a killer handwired amp!).

5.0

Awesome Amp!

By

Verified Buyer


My first attempt at Amp building, worked out great! This thing sounds amazing, don't let the "15W" power rating fool you, this dude is LOUD!
I have one thing to warn others about:
1. When soldering the V1 & V2 small tube sockets, turn the amp chassis so that the pins are horizontal to help keep the solder out of the spring pins and use minimal solder. I clogged several of the tube spring pins on mine and had to replace the V1 socket.

4.0

59 Tweed Amp kit

By

Verified Buyer


Recently ordered the 59 Tweed 15W. Started the build this week end.

Good points
1. Arrived quickly and w/o damage
2. Original Fender look-alike
3. Parts and components well organized.
4. For the most part build instructions clear.
5. Cabinet workman ship quite good.

Not so good points.
1. Schematic diagram missing much detail, I understand schematic and expect this detail w/ kits.
2. Power transformer shipped with the amp does not match assembly instructions. Instructions show a single two conductor primary (120 VAC), where as the actual transformed has option for 100 VAC, 120 VC, 220 VAC, 230 VAC, and 240 VAC....five extra wires not accounted for in the instructions. Discovered this by going to the web page for 'Mojo'.
3. Studs for mounting the Jensen 12" speaker did not line up with the mounting holes on the speaker, had to 'tweak' the studs (aka bend) to mount the speaker.
4. It would be nice to offer the option of using the 'ground' switch as a "Stand by' switch. The toggle switch provided has no functionality. Am thinking I will install a SPST toggle in this position and make a "Stand By' feature


I am about half-way through the build and can't wait to hear what this amp sounds like. In the past I played a 57 Fender Custom Deluxe 12 W, expect this 59 Tweed amp will sound similar w/o the "Stand by" feature, Hope so. Over all am impressed w/ this kit I am not a tube geek, if this amp sounds good when done I will be happy. At this time in history am happy tube amps are still out there and an option for kit builders. Thank you for keeping this technology alive!

5.0

Great amp, great support, but somewhat frustrating for a newbie to build

By

Verified Buyer


Let me start by saying that I've finished building the '59 Tweed 15W amp kit from StewMac and it sounds amazing. I have an original Fender to compare it against and I'm really happy with how it turned out. I also want to point out that the folks providing support at StewMac did a stellar job of helping me as a first time builder.

That said, this journey was not without it's frustrations, mostly due to my lack of experience. If you are a first time builder, here's what I found out that may be useful.

As someone else pointed out in an earlier review, the cabinet speaker bolts on my kit were out of alignment. This led to a nerve wracking moment where I wasn't sure I would be wrecking my speaker to install it, but could not easily get it off once I had started. Ultimately I was able to seat it and it sounds fine, but given that the instructions have a specific warning about not warping the speaker basket it was stressful to deal with. If your kit has this issue, decide whether you are going to ask for a replacement before starting to seat the speaker.

When numbering the eyelets on the circuit board, try using a light colored pencil. The graphite works, but something lighter would be much easier to read and could save considerable eyestrain. These numbers are will be referred to at different times during the build.

The included instructions were outdated (from 2018) did not apply to the current power transformer part. I've been assured that the new manuals have been swapped out, so this is not supposed to be a current issue. If you do get an outdated manual, the correct instructions can be found and downloaded from StewMac.com.

The multimeter suggested by the instructions and fulfilled by StewMac did not have extensions that allow for safely taking measurements. I needed to buy a set of cables with clips, otherwise there was no way to observe the one-hand rule for checking voltages. I found what I needed at amazon for about $15.

This same multimeter did not have the markings called out in the instructions. This is not a big deal if you have experience with using a multimeter, as you just use the nearest setting. For example, when the instructions indicated setting the meter to read 20V AC, the correct setting on the multimeter fulfilled by StewMac was 60V AC. The bottom line is that you really should know a little more than I knew about multimeters to start or expect to have to call to find out.

The information regarding the voltages being within 10% were based on the final voltages of the amp with the tubes installed, not on the voltages that are read as per each step in the instructions. This meant another call to tech support to find out that higher voltage I was reading was not unexpected.

The 7" green jumpers (somewhere around step 84) needed to be closer to 8" in order to support a 90 degree bend.

Continuity test is a critical part of troubleshooting that is not uniformly called out. My amp developed a major hum after I had already successfully played guitar though it. It turned out to be loose connection I found through a continuity test. Again, this is something someone with more experience would probably know, but the instructions at this step were talking about probing with a wooden chopstick.

And finally, if I were to do this all again I would start by getting advice from technical support on the best way to wrap leads and which side of the circuit board to solder.

5.0

'59 Tweed

By

Verified Buyer


Good instructions and well documented.

5.0

Great Project!

By

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!

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