I almost always play small combo amps of 20 watts or less. But I wanted something with a bit more clean headroom for a possible upcoming project — and to demo my stompboxes. I’ve always enjoyed playing JTM-45s when I’ve reviewed them for guitar mags, so I ordered Monotone’s British 45 kit.
I’d previously had a great experience building Mojotone’s Marshall 18 watt clone kit when I reviewed it for Premier Guitar a couple of years ago. It turned out great, and I use it regularly.
Mojotone provides high quality parts, nearly labelled and organized in plastic compartmented boxes. But beware: The company provides no build instructions — just a layout diagram and a schematic. You need amp building experience or help from an expert. Click play for a slideshow about he build:
This is Mojotone's new offset head cabinet. (The amp chassis first in other Mojotone cabinets as well.)
The two power tubes can be either EL-34s or KT-66s. (I chose the latter, just for a new experience.)
The parts come neatly labeled and organized in plastic bins — a BIG help!
Warning: the kit includes no build instructions — just this layout diagram and a schematic.
I ALMOST managed to assemble it, but I needed a rescue at the end. (Thanks to Bruce Clement of BC Audio, a brilliant boutique builder here in San Francisco.)
Mojotone supplies their own branded transformers (which sound fab).
It's a turret board build. (The board and turrets are pre-made, as opposed to some kits, which require you to insert the turrets yourself.)
This is probably not a good first build — maybe start with a nice little tweed Champ kit?
The a plexi faceplate, which I left omitted. I also substituted my own knobs.
I nearly made it through myself. (Translation: I soldered everything together and it didn’t work.) So I had to hire Bruce Clement of BC Audio here in San Francisco to rescue me. (Bonus: Bruce loaned me one of his JTX50 heads. Man, it’s one of the best-sounding Marshall derivatives I’ve ever heard. It’s among his Octal-Plex series amps, which use octal preamp tubes in Marshall-inspired designs.)
How come my DIY amps never look this pretty inside?
A couple of weeks ago I posted here about a Premier Guitar project in which I built two Marshall 18-watt clone kits. Meanwhile, the magazine received a review model of Marshall’s latest iteration of the 18-watt, a high-end, hand-wired version that sells for $2,700. My new review is online at PG, if you’re curious to hear a proper Marshall as well as the clones.
My take: It’s a beautifully built, hand-wired amp that sounds as least as good as either clone. Unlike the kits with their single 12″ speakers, the Marshall has a pair of 10s, which I think I prefer in this circuit. At $2,700, though, it’s pretty darn expensive, even for a beautiful, hand-made instrument. But I’ll be sad when I send the review model back to Bletchley.
I had a blast building and testing two Marshall 18-watt kits for a Premier Guitar story — and I emerged with new respect for this cool 1965 design.
These mini-Marshalls were neglected in their day, but are now treasured. The oft-heard claim that they provide plexi tones at reasonable volumes is only partially true — these are open-backed combos powered by a Vox-like pair of EL-84s tubes. But while they have roughy the same horsepower as the era’s Fender Deluxe and Vox AC15, their tone is undeniably ’60s Marshall. In the studio, they sound far larger than their actual size. And out of the studio, they’re still pretty darn loud.
I’ve never seen three 18-watts in the same place before.
Even though the Mojotone and Tube Depot kits I built share the same schematic (and identical cabinets, both made by Mojotone), the build experiences and final results differed greatly.
And just when I thought I’d scaled the Everest of 18-watt ecstasy, I get a real Marshall 18-watt reissue for an upcoming Premier Guitar review. Stay tuned.
Are any of you guys 18-watt fans? Any observations to share?
I just received from Warmoth all the parts for my next DIY guitar. I loved testing eight sets of P-90 pickups for Premier Guitar, but I don’t own any P-90-eqipped guitars.I will soon, though!
This one will be a bit of a platypus — as opposed to, you know, all my other other platypi. (The actual plural of “platypus” is “platypuses,” but “platypi” is more fun to type.) It’s built from Warmoth’s “split Jazzmaster” template, with a korina body, bound neck, Tune-o-matic/stop-tailpiece bridge, and a pair of hum-cancelling Fralin P-92s. Yeah, it’s kind of a stab-in-the-dark experiment, and not a inexpensive one. But hope springs eternal. Prepare to be bored with details!
I’ve also just received an amazing-looking pair of condenser mics from Portland, Oregon’s Ear Trumpet Labs. ETL kingpin Philip Graham’s business card identifies him as “proprietor and bricoleur.” Bricolage, of course, is the ten-dollar word for “making stuff out of junk and other found objects.” Dig the steampunk vibe of that repurposed hardware! I haven’t even plugged these in yet (though the reviews I’ve read have been stellar). I just like staring at them! But I’m going to try them out at my monthly Strung Out! show tonight.
Ear Trumpet Labs’ Edwina and Edna models: a higher calling for found objects!
Which brings me another of this week’s highlights: I got to perform last night with my dear friends Teja Gerken and Adam Levy. Teja is an astonishing acoustic fingerstylist and a fine composer. His vocabulary has hints of Bensusan, Hedges, and classical, but he’s molded those influences into a thoroughly unique sound. And Adam, who I’ve known since my Guitar Player magazine days, is equally renowned for his jazz work and for accompanying such singer/songwriters as Norah Jones and Tracy Chapman. (I get to play some of Adam’s cool parts when I gig with Tracy.) These days Adam’s focusing on songwriting, and he his sings his “smart Americana” songs (my description, not Adam’s) in a sweet, soulful voice. Man, what a treat to hear both of them up close. And tonight, Adam, Shelley Doty, and I perform at my local dive, El Rio. Can life get any better?
Apparently so! Yesterday Premier Guitar posted John Bohlinger’s piece on the Pixies, which includes a pic of Charles “Frank Black/Black Francis” Thompson’s pedalboard, with my grubby, hand-built Duh fuzz pedal front and center. I’d originally made if for Joey Santiago, the other Pixies guitarist, but I guess Charles swiped it. Hey, I’d be honored if either guy spat on the thing! They’ve been heroes since I first heard the band in a small San Francisco club back in ’88. (Everyone went to hear the Sugarcubes, but left talking about that awesome opening act from Boston.)
Frank Black’s pedalboard: Lookit! I’m Pixies-approved!
It’s funny, because I really was thinking “Pixies” when I sound-designed the Duh. I was going for “bubblegum metal” — a thick, heavy sound, but not a macho one. The tone is too fizzy and funny for 100% sincere heavy rock, IMHO. It’s more of a “greasy kid stuff” distortion. (Note to readers under 45: That was once the tagline for a “dry look” mens hair product, referring to the outdated coiffures that would return with a vengeance when punk broke a few years later.) It’s a vaguely Muff-like sound, but with less compression, less scoop, and one big, stupid knob. I also like building that circuit into guitars. Like this one:
So it’s been a grand week, but a hectic one. Thanks for reading this far. Next week I promise a proper post, and not another collection of … odds & ends.
Let’s not just talk about one-knob gear — let’s design some! Any interest in conspiring to create a minimalist DIY amp?
Frankly, the intensity of the reaction to my recent One Knob Manifesto startled me. I had a general sense there was a growing interest in minimalist gear, but I was no idea the sentiment was so intense. (Though I’d hesitate to draw too many conclusions based on a focus group of the obsessive geeks who hang out here.)
Now, don’t get your hopes up — we probably won’t create anything QUITE this awesome.
The limited edition Love amp fascinates me. Not its ornate furnishings, but the minimal controls: no tone stack, not even a volume control. It’s pretty much exactly what I was talking about when I expressed an interest in an amp with nothing but an on/off switch. That desire became even more focused last week when I reviewed a fabulous amp from a new Colorado Springs company called Toneville. (I’ll link to the Premier Guitar review when it goes live in a couple of weeks.) The Toneville Beale Street model I reviewed features a full compliment of blackface-style controls, but the tone controls are voiced so that the tone stack can largely be removed from the circuit, and there’s also a pot to remove the negative feedback loop for a more tactile/primitive response. As with some other ultra-high-end amps I’ve written about recently (like the Little Walter 50/22 covered here), the tone controls sound great wide-open, and it matters surprisingly little where you set the volume — you just drive it hard enough to warm things up, and then shape the tone from the guitar. With a nicely voiced and biased amp, you need far fewer controls than you might think. And the more crap you omit, more livelier the reponse and the more immediate the tone
The no-controls Mill Hill Love amp.
So why don’t we collectively create something in this vein? A simple but great-sounding tube amp with nothing but an on/off switch? I’ve never designed anything such thing and have little relevant expertise beyond the knowledge that, unlike 9v stompboxes, AC-powered amps can kill you. But I’ve built enough kit amps to know that a one-knob head can be easy, potentially inexpensive (though you could invest in ultra-premium tranformers, vintage tubes, NOS parts, and so on), and it should sound stunning. If we come up with a plan, we can source the parts, create step-by-step instructions, and probably get a vendor to put together a kit for us. (I’m thinking out loud here, so bear with me.)
I’m not firm on many details other than these:
head-only design (at least initially)
low-wattage for home/studio use — something you can crank without self-evicting
should sound big and bad-ass (not a cheap, practice-amp sensibility)
Any interest, folks? And more important, any ideas? And more important, any ideas? What would make this fun, useful, and bitchin’?
I just bought 500 germanium transistors. (Yes, as a matter of fact, I am insane. Why do you ask?)
UPDATE: My Dunlop Fuzz Face Mini review is live at Premier Guitar. Audio clips included!
How and when did it get so frickin’ easy to procure great-sounding germanium transistors?
I’ve been building stompboxes for four years or so. I used to consume article after article detailing the sheer horror of dealing with germanium. Sure, those old-school transistors sound great, I’d read, and they’re necessary for vintage distortion circuits. But they’re unstable. They’re expensive. They’re hard to find. You have to sort through dozens to find the few good ones. And once you do, you must spend countless hours matching and biasing them for optimal sound.
I believed everything I read — until I finally admitted to myself that I seldom encountered any of those problems.
(If you don’t know much about germanium transistors and why they’re cool, here’s my manifesto.)
I used to buy germanium transistors from Small Bear and other parts sites, and was always happy with the results, even though I had to pay eight or ten bucks per transistor. (Small Bear even does the matching for you, offering sets of transistors suitable for various vintage fuzz circuits.) However, it was a little tough finding NPN (negative-ground) germanium transistors. In fact, Small Bear once rejected my order of a dozen or so NPNs because they were so scarce. (To his credit, Small Bear’s Steve Daniels explained that he restricted sales so that everyone who wanted to build a couple of great DIY fuzzes would have the opportunity.)
The workaround is to build pesky positive-ground pedals, or jigger with the schematic in order to use PNP (positive-ground) transistors in negative-ground circuits. (This site’s Fiendmaster project is an example of the latter workaround.)
We’re far from the first to cover this ground. In fact, I should have mentioned a couple of great articles on Fuzz Face mods. We’ve talked about the technique of using sockets in your build so you can audition multiple components. Years ago DIYer Gary Burchett took this notion to its logical conclusion with the Multi-Face, a Fuzz Face with most of the components socketed. It’s definitely worth trying this. Meanwhile, this Instructables project by randofo explains how to create a super-versatile Fuzz Face using switchable components.
Trust me — despite the simplicity of the circuit and the sheer number of adventurous souls who have deconstructed and reconstructed it, it’s hard not to play around with it and find something cool and new. That too is a truth universally acknowledged!
When you make DIY stompboxes powered by 9-volt batteries, your biggest fear is a solder burn (or dropping your drill on your iPad, but that’s another story). DIY amps are different: AC voltage can kill you, so a klutz like me approaches amp builds with caution.
Which brings me to one of the great things about Tube Depot’s Tweed Champ Vacuum Tube Amp Kit: the fantastic assembly manual. Other great things include the price ($499, roughly half the price of a non-kit Champ clone of comparable quality). The design (which follows the original circuit, but substitutes an intelligently designed circuit board layout for the original turret board). And most of all, the tone.
I’ve got lots more to say about the kit, the fun I had building it, the lore of the 5-watt ’58 Champ, and the pros and cons of Class A amps (the Champ is the only Fender classic that merits the classification). But first, have a listen!
I've got a Tweed Champ kit, and I'm not afraid to use it. Or at least not VERY afraid.
I’ve got a Tweed Champ kit, and I’m not afraid to use it. Or at least not VERY afraid.
Why do they make amps so damn loud?
It’s not just a cranky question from a guitarist who’s drawing depressingly close to the “Get off my lawn!” years. I ask sincerely: Why?
Big amps make total sense — but only if a) it’s 1969, b) you’re playing venues with Jurassic sound reinforcement, and c) you’re a guitarist in danger of being drowned out by Keith Moon or John Bonham.
Okay, end of harangue — I’ll have time for that when I’m chasing kids off my lawn (after I move to the suburbs and GET a lawn). But as I get psyched up to build this review model of Tube Depot’s Tweed Champ kit in the coming days, I figured I’d ask what folks are using these days to get cool amp tones in their bedrooms and basements. Not dedicated practice amps, necessarily, but great-sounding stuff that happens to be ultra-low-wattage? Name your petite-amp poison!
Anyway, I’m stoked about this kit. I’ve already completed a few amp clones from Ceriatone. They were fun to build and sounded great. But I can tell right off the bat that this Tube Depot kit has at least one major advantage over its Malaysian cousins: This one comes with a fabulous 40-page instruction manual. (Most clone vendors simply link you to a schematic.) Having created a few step-by-step instruction manuals myself, I can testify how much painstaking work these entail. Hats off to Tube Depot’s Rob Hull for doing it right!
Details and build report to follow. But now, let’s talk tiny-amp tone!
