Categories
DIY Effects guitar Pickups

Blood on the Workbench

Small puncture, big pain.
Small puncture, big pain.

I was trying to decide which self-indulgent experiment fascinating project to demo this week when my hand slipped, driving a sharp soldering iron tip into the meat of my fretting-hand index finger. It didn’t hurt all that much—until I tried to play. Ye-OWCH! (No, of course I wasn’t using the tool properly! I was trying to pick loose a knot of wire with the iron’s tip rather than the recommended wire-picker-thingy.)

So no guitar recordings for me this week while my poor l’il finger recuperates. But I’ll try to compensate for this dog-ate-my-homework post by sharing three works in progress. If they turn out well (and they might!), audio and video will follow.

1. Lipstick Tubes Revisited. For more than a year, the generic Mexican Strat I fitted with lipstick tube pickups has lived, disassembled, in a filthy cardboard box next to my workbench, guilt-tripping me every time I fired up the soldering iron. There were a number of experiments I’d been meaning to perform on it, and in a spectacularly bad example of scientific methodology, I incorporated them all at once, making it pretty much impossible to discern what’s doing what. But I hear some things I like. Here’s what’s new (beside the blood spatters):

lipstick_labeled

Not everything is working as desired yet — but there are some promising directions here, and it’s so nice to have a lipstick tube instrument again. :pacman:

Joystick fuzz: like giving a loaded gun to a monkey.
Joystick fuzz: like giving a loaded gun to a monkey.

2. The Joy of Stick. Anyone tried a joystick effect, like Devi Ever’s Drone Fuck Drone? I bought a few joysticks from 4Site and have been having a blast. I thought they’d be difficult to wrangle, but it’s really just two pots, each with the standard three-lug connection, deployed in X/Y configuration. Two things to bear in mind, though: They’re generally available only with identical resistance values for each pot, and more important, you need two controls that have meaningful values throughout their ranges. Fortunately, I had just the circuit for it: my Filth Fuzz (which Fuzzbox Girl was kind enough to demo and review in 2011). I’d even labeled the controls X and Y! (I’m not selling these, but I do hope to bring it to market before long. Honest.)

photo

3. A Reanimated Amp.  This one’s personal: I’m finally refurbishing the 1951 “TV front” Fender Deluxe amp that I received for as a bar mitzvah present in the ’70s. (I was mature enough not to express my disappointment over getting some crummy old tweed. But how I longed for that shiny post-CBS crap!) My mom procured it from the son of one of her fellow elementary school teachers, who worked at Fender in nearby Fullerton. (Sadly, I’ve forgotten his name.) I also got to pick from three early-’70s Fender guitars: a sunburst Strat, a paisley Tele, and a black Jazzmaster. I, of course, chose the Jazzmaster — at the exact moment when no one on earth gave a crap about that model.  And naturally, I sold it just when new wave arrived and Jazzmasters became cool again. See? I established my pattern of buying and selling the wrong things at the wrong times while still in my teens!

I didn’t wreck the amp by myself — the process started with the black paint job it acquired long before I entered the picture. Over the years it received a preamp mod from Paul Rivera, and later got totally ruined by an overambitious repairman who added mods I never requested, and who probably stole most of the original electronic parts. But the cab, chassis, speaker, and output transformer are original, and there’s no reason why it shouldn’t sound bitchin’ after I restore it to its original 5A3 circuit. I’m getting expert help from Tube Depot’s Rob Hull, who helped me source parts and make a grommet board to house the components.

So my apologies for all talk, no audio. My boo-boo is healing, and I should be back able to, like, actually play some of this stuff soon!

Categories
DIY guitar

The Fender TBX:
A Cool 2-Band Tone Control

You can TELL it's Photoshopped! There's no TBX!
You can TELL it’s Photoshopped! There’s no TBX!

Thanks again to everyone who chimed in on the “What your favorite mod?” discussion. I got tons of great ideas from your comments.

Like this one, which I’ve been meaning to explore for ages: the Fender TBX tone control circuit, which appears in several Custom Shop instruments, notably the Clapton signature Strats. Like the G&L PTB circuit I’m so apeshit about, it’s a 2-band passive tone control — but one that sounds very different.

The PTB is a two-knob circuit that lets you siphon off highs, lows, or both. I’m agog at how well it works with humbuckers — you can get so many cool sounds by rolling off lows on the way to a fuzz, as heard here.

But TBX (it stand for “treble bass expander”) is a one-knob circuit, tbough that single knob rotates two stacked pots. The control has a center detente. Set here, it’s like a regular tone control, wide-open. Turn it counter-clockwise and highs vanish, per usual. (You could “tune” the roll-off frequency with various capacitors, though I went with the stock .022uF.) But when you rotate clockwise, the absence of lows makes glassy highs erupt.

The dual pot cut highs or lows.
The dual pot cut highs or lows.

Technically, it’s not a boost, but it sure feels like one. Dirk Wacker, my now-colleague at Premier Guitar, dissects the circuit far more capably than I can here. (And he goes way beyond in this subsequent article on TBX mods. Man, I have some catching up to do!) He makes a good case for replacing the stock resistor with another value, but I went with the original 82K to establish a point of reference. I’ll try his mod when I restring, and I’ll update you here.)

BTW, you need the Fender TBX kit for this project — it uses highly customized pots to work its magic, and a standard stacked pot won’t do. But it’s cheap: You can find the TBX kit, with the pot, hardware, and passive components, online for about $15.

I put it into the mongrel strat I’ve been using as my digital synth/looping guitar. I’d been using a Stellartone Tone Styler, a cool Vari-Tone variant that switches between multiple capacitors. I dig it, but it’s the old model which clicks, rather than fades, from setting to setting, and it requires a powerful twist of the wrist to go from maximum to minumum, which I do every time I grab an EBow. Since I hadn’t gotten around to replacing it with the smooth-action version, I figured I’d try the TBX.

And I’m glad I did. It’s a super-easy install, at least to the extent that any job that requires removing both strings and pickguard can be easy.And here’s how it sounds:

I’m going to keep this one around for awhile. You’re hearing it through an analog rig, obviously, but I want to find out whether that extra shot of highs does anything meaningful when playing digitally. I’d also like to experiment with different cap and resistor values.

And now I can’t help wondering whether this would sound cool with humbuckers. Anyone have any experience with that?