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Wren and Cuff The Good One Dirty Guts Vintage Sustainer Guitar Effects Pedal

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Wren and Cuff The Good One Dirty Guts Vintage Sustainer Guitar Effects Pedal


Manufacturer's Description

All this to say, after studying and analyzing so many Muffs over the years, one thing I know for sure is that vintage does not always mean great tone. This is particularly true of triangle knob era Muffs which have been reported to have up to 18 different circuits all housed in the same enclosure! As of this writing, I’ve personally come across two that I considered subpar. So, even though this pedal was a super cool specimen, I knew there was no guarantee it was going to sound good. For a real treasure, you have to come across a truly GOOD ONE.

 Once I got it all together, I was very pleased to find out that in this case, I was listening to what I consider to be one of the good ones.


This one is pretty straight forward as I’m sure you’ve figured out. From everything I could piece together, the pedal was most likely produced in 1972. The unusual polarity of the circuit (surprisingly, the Smith pedal was a positive ground circuit, very rare for any muffer regardless of era), as well as transistors, make this unit easier to date than some.

“Dirty Guts”

Along with the unusual component values, another thing stuck out to me: nearly every capacitor in the circuit was the cheap ceramic disc type. Ceramic disk caps were very plentiful in those days and used in many situations when all that was required was a simple capacitor to get the job done; it didn’t need to be anything special. However, in audio circuits (high gain circuits in particular), they are often avoided because they can be microphonic, noisy, and have some nonlinear characteristics that are less than desirable in several different applications. Over the years, even Electro-Harmonix® favored only using ceramic caps mixed with the more desirable metal film caps, rarely using all ceramic disc types for the reasons previously mentioned. There have been other versions of vintage Muffs that were all ceramic caps, but not many.

However, as many of us know, pedals are weird; sometimes using the “wrong” components creates a certain magic that can’t quite be explained, and the G. Smith pedal was proof of that.

So here’s where the “Dirty Guts” come in. I decided to seek out surplus bags of old crusty ceramic disk caps. The older and dirtier, the better. There was some trial and error; I wanted caps that were old, but also consistent. There were batches that were too inconsistent or too crumbly and delicate from improper storage to be used. Some were just too cheaply made. But after some hunting around, I was able to find old, dirty, somewhat crusty, but reliable and consistent caps that would help to recreate the magic inside of Mr. Smith’s pedal.

When you look inside the Good One, it’s a grungy mix of old and new that has its own unique beauty.

That covers the text on the front. Now we’re on to some other details in the guts of your new pedal. We’ve already covered capacitors, so let’s go over the rest of the core components we have yet to discuss.


For the Good One, I elected to use NOS carbon composition resistors wherever possible. However, after doing some measurements, there was a particularly odd-ball value that was quite a ways off from its stated value. Because the value of these resistors is not a standard one for carbon-composition resistors, the only way to compensate for this was to use two mil-spec metal film resistors. So, if you take a peek inside the pedal, you’ll see two shiny new light blue resistors nestled in with all those old-school brown carbon comps.


For the transistors, I settled on two that I had never used, nor come across before. I went through a few different vintage transistors, tried a mix of old and new, tried all NOS, then all new, and several combinations thereof. This pedal had me searching outside of any go-tos I have used in the past. After poring over way too many data sheets, I finally settled on a couple of transistors that were not NOS, not crusty, not that hard to find, not commonly used for pedals, but that absolutely nailed the sound of the original half-spherical FS3700 black-top transistors. I really wanted it to be some quirky old part that was as rare as hens teeth, but alas, it was not to be. I had to follow the sound!

The rest of your new pedal follows our usual practice of top-quality components, hand-wiring, and genuine mechanical true-bypass switching.

The heavy-duty folded steel enclosure is made, painted, and silkscreened here in Los Angeles by two multigenerational small businesses.

So there it is… the story of The Good One, affectionately known as the “G Smith” here at the shop. I truly hope you treasure this unique pedal for many years to come.


  • Power: This pedal uses a 9V battery or a center-negative 2.1mm barrel regulated power supply (typical guitar pedal power unit). If using a power supply, please use one intended for effects pedals.
  • Current draw: Approx 5mA