I remember the first time I tried to swap a knob on my old MXR Phase 90. I’d seen countless YouTube videos of people effortlessly popping off knobs, slapping on some shiny new custom ones, and voilà – a personalized pedal. Mine, however, refused to budge. It was like it was welded on. This led me down a rabbit hole of questions, the most persistent being: are MXR pedals 6mm knob? It’s not as straightforward as you might think, and frankly, a lot of the advice out there is just plain wrong.
You see, while many pedals use a standard 6mm shaft, not all MXR pedals, especially older or specialized ones, stick to that rule. It’s enough to make you want to throw the whole thing against the wall, or at least give up on making your pedalboard look less like a factory floor.
Why Knob Size Matters (and Why Mxr Isn’t Always 6mm)
Look, nobody buys a pedal because they love the off-the-shelf knobs. They buy it for the sound, for the circuit, for the iconic look. But after you’ve stared at that same cheap-feeling plastic knob for a year, you start to crave something more. Maybe you want a different color, a taller profile for easier stomping in the heat of a gig, or just something that doesn’t feel like it’s going to snap off if you look at it wrong. This is where knob swapping comes in. But before you go ordering a dozen ‘standard’ 6mm knobs online, you need to understand that the answer to ‘are MXR pedals 6mm knob?’ is a frustrating ‘sometimes’.
For many of their more common pedals, like the Carbon Copy, Dyna Comp, or the aforementioned Phase 90, MXR has historically used what are commonly referred to as ‘6mm’ or ‘6.35mm’ split-shaft potentiometers. These are the most prevalent type found on a wide range of guitar effects pedals from various manufacturers. The ‘split shaft’ part is key here, meaning the shaft itself is hollow and split down the middle, allowing the set screw in the knob to get a better grip. It’s a smart design that makes them less likely to slip than a solid shaft. However, MXR, in their infinite wisdom, also likes to mix things up.
I’ve seen pedals, particularly some of their reissues or limited runs, that use slightly different shaft sizes or even different types of potentiometers altogether. Sometimes it’s a metric size, sometimes it’s a slightly larger diameter, and occasionally, you might even find a solid shaft in there, though that’s rarer on their effect pedals. This inconsistency is what trips people up. You order a batch of what you think are the correct knobs, only to find half of them don’t fit. It’s maddening, and frankly, it’s a waste of money and time. I once spent nearly $80 on a set of custom knobs from three different suppliers because I was too stubborn to just measure the damn shaft first.
The bottom line is, if you’re asking ‘are MXR pedals 6mm knob?’, the most honest answer is: probably, but don’t bet your entire pedal upgrade fund on it without checking. Especially if you have an older pedal, a less common model, or something that looks a bit different from the standard fare. It’s always best to verify.
The Real Deal: How to Figure Out What Size You Actually Need
So, you’ve decided you want to change your knobs. Great! Now, how do you avoid my costly mistake and figure out what size shaft your MXR pedal actually has? It’s not rocket science, but it does require a bit of detective work and a simple tool. Forget all the online forums and speculative advice for a second. The most reliable method is to simply measure what’s already there. You’ll need a ruler or, even better, a set of digital calipers if you have them handy. They’re not expensive and they’ll save you a ton of grief in the long run for all sorts of DIY projects.
First, gently pull the knob straight off the potentiometer shaft. Most knobs are just friction-fit, so a steady, even pull should do the trick. If it’s really stuck, you might need a knob puller tool, but try to avoid excessive force. Once the knob is off, look at the potentiometer shaft itself. You’ll see the splines or the split design. Now, measure the diameter of that shaft. If you’re using a ruler, try to measure across the widest part of the splines. Be aware that this can be a bit imprecise. If you have digital calipers, this is where they shine. Just open the jaws around the shaft and get a precise reading.
The most common sizes you’ll encounter are 6mm (or 0.236 inches) and 6.35mm (or 0.250 inches). These are often used interchangeably in descriptions, but there’s a slight difference. If your measurement is very close to 6mm, you’re likely in the clear for standard 6mm knobs. If it’s closer to 6.35mm, you’ll want to look for knobs specifically advertised for that size. Sometimes, you might also encounter 3mm or 4mm shafts, especially on smaller electronics or older gear, but these are less common on mainstream MXR pedals.
Another thing to check is the type of shaft. As mentioned, most pedals use split shafts. If you have a solid shaft, you’ll need knobs designed for that. They usually have a solid internal diameter and are secured with a set screw that tightens directly onto the shaft. While less common on MXR effects, it’s worth noting. My first pedal modification attempt involved a solid shaft knob on a split shaft pot, and let me tell you, that thing spun like a top. So, measure twice, order once. It’s the simplest way to make sure you’re buying the right part and avoid asking ‘are MXR pedals 6mm knob?’ for the tenth time.
Measuring Your Potentiometer Shaft
- Gently remove the existing knob from the potentiometer.
- Identify the potentiometer shaft – the metal post the knob attaches to.
- Use a ruler or digital calipers to measure the diameter of the shaft.
- Note whether the shaft is split (most common) or solid.
- Compare your measurement to standard knob shaft sizes (6mm, 6.35mm).
Common Mistakes When Choosing Mxr Pedals Knobs
Alright, let’s talk about the pitfalls. Beyond the basic shaft size confusion, there are other ways to mess this up when you’re trying to get new knobs for your MXR pedals. This is where the real frustration kicks in, and where you start to question if it’s even worth the effort. Trust me, I’ve been there, done that, and bought the ridiculously overpriced replacement knobs. (See Also: Are There Some Intereror Door Knobs That Cant Be Removed )
The first big mistake is assuming all knobs are the same depth or height. You might find a gorgeous set of knobs that look perfect in pictures, but when they arrive, they’re either too short to get a good grip or too tall, making your pedal look a bit awkward and potentially even interfering with other pedals on your board if they’re placed too close together. This is especially true for knobs designed for specific functions; a large amplifier control knob isn’t going to fit well on a small effect pedal.
Then there’s the material and feel. Many stock MXR knobs are made of plastic, and while functional, they can feel a bit cheap and slippery.
You might opt for metal knobs, which can look fantastic and feel more substantial. However, metal knobs can be heavier, which adds a tiny bit of weight to your pedal. More importantly, the set screw on a metal knob might dig into a softer potentiometer shaft over time, potentially causing damage or making it harder to remove later.
You also need to consider the knurling or texture. Some metal knobs have aggressive knurling that can be uncomfortable to turn, while others have a smoother finish that might be too slick if your hands get sweaty.
I once got a set of machined aluminum knobs that looked amazing but felt like I was trying to grip a polished ice cube when my hands were even slightly damp. Useless.
Another common error is ignoring the aesthetic. While functionality is key, you’re probably looking to customize your look. Buying knobs that clash with the pedal’s graphics or the overall vibe of your board is a bummer. Think about color, texture, and style. Are you going for a vintage look, a modern minimalist vibe, or something wild and psychedelic? Also, don’t forget to consider the indicator line or pointer. Some knobs have a prominent line to show the current setting, while others are plain. If you rely on that indicator line, make sure your new knobs have one, and that it’s visible and clear.
Finally, and this circles back to the primary question, people often buy knobs in bulk assuming they’ll fit any pedal. If you’re buying a set of knobs for your MXR pedals, and you’re asking ‘are MXR pedals 6mm knob?’, you need to understand that this might only apply to some of your MXR pedals. A bit of research into the specific models you own, or a quick measurement, will save you the headache of having a drawer full of beautiful, but ultimately useless, knobs. It’s this kind of attention to detail that separates a slick-looking pedalboard from a frustrating DIY project.
Real-World Use: Swapping Knobs on My Mxr Collection
I’ve been accumulating MXR pedals for years. They’re workhorses, and honestly, most of them sound fantastic right out of the box. But the itch to personalize, to make them feel like mine, is strong. I’ve swapped knobs on at least a dozen different MXR pedals, from the classic Script Phase 90 and Dyna Comp to newer offerings like the Duke of Tone and the Carbon Copy Deluxe. This hands-on experience has taught me a lot about what works and what doesn’t when it comes to the question of are MXR pedals 6mm knob and their variations.
My first real success was with a reissue of the MXR Distortion+. The original knobs were those classic chicken-head style, which I found a bit flimsy. I measured the shaft – it was indeed a standard 6mm split shaft. I picked up a set of black, rubberized knobs with a prominent white indicator line. The change was immediate and satisfying. They felt solid, gave me a much better grip, and looked way cooler. This pedal became my go-to for gritty overdrive, and the new knobs just enhanced the experience. It felt less like a toy and more like a serious piece of gear.
Then came the MXR Carbon Copy. This pedal is legendary for its analog delay. The stock knobs are fine, but I wanted something a bit more tactile. I measured the shafts on the speed, intensity, and mix controls. To my surprise, two of them were standard 6mm split shafts, but the third one, I swear, felt slightly larger, almost like a 6.35mm. I ended up ordering a set that was specified for 6.35mm, and they fit snugly on all three. It’s these little discrepancies that make me hesitant to give a blanket ‘yes’ to the ‘are MXR pedals 6mm knob’ question. MXR seems to use what’s readily available or what fits the aesthetic best for a given model. (See Also: Are Trak Lpm Retension Knobs Same As Haas )
My most frustrating experience was with an older Dunlop-era MXR Flanger. I wanted to replace the chunky black knobs with some smaller, more vintage-looking amber-colored ones. I pulled off a knob, measured the shaft, and it looked like a standard 6mm.
I ordered the amber knobs, but when they arrived, they wouldn’t quite seat properly. They felt loose.
Digging deeper, I realized that the potentiometer shaft on that specific Flanger was a fraction smaller, maybe closer to 5.5mm, or it had a different spline pattern that didn’t grip the new knobs well. I ended up having to use a tiny piece of paper wrapped around the shaft to make the knob fit tightly. It worked, but it wasn’t ideal and felt like a hack job. This taught me that visual inspection and measurement are king, and sometimes, even then, you get a curveball.
For those asking ‘are MXR pedals 6mm knob?’, my practical advice from years of hands-on work is this: assume it’s 6mm or 6.35mm split shaft for most modern pedals, but always, always measure your specific pedal before you buy. If you have an older or more obscure model, be prepared for potential variations. The small effort of measuring pays dividends in avoiding wasted money and project delays.
Lsi Keywords & Practical Tips for Knob Swapping
Let’s get down to brass tacks with some practical advice that goes beyond just measuring. If you’re looking to swap knobs on your MXR pedals, or any pedal for that matter, there are a few things that can make the process smoother. We’ve covered the shaft size, but what else should you be thinking about? Well, the world of effect pedal knobs is surprisingly diverse. You’ve got your standard plastic ones, metal ones, rubberized ones, vintage-style chicken heads, and even custom-made machined aluminum beauties.
My first tip: always buy a few extra knobs if you can. Pedals often have multiple controls, and you might want them to match. If you only buy one or two, and then decide you want the rest to match later, the original supplier might be out of stock, or they might have changed their manufacturing batch, leading to subtle color or texture differences. It’s better to have a couple of spares than to have one mismatched knob on an otherwise perfect-looking pedal. I learned this the hard way when I tried to match knobs on my MXR Carbon Copy a year after the initial swap. The new ones were a slightly different shade of black.
Second, consider the set screw. Most replacement knobs come with a small set screw. Make sure you have the right size screwdriver to tighten it. Tiny Phillips head screwdrivers are common, but sometimes you might encounter a flathead. It’s a good idea to have a small electronics screwdriver set on hand. When tightening the set screw, don’t go crazy. You want it snug enough so the knob doesn’t slip, but over-tightening can strip the screw or even damage the potentiometer shaft. I’ve seen folks crank these things down so hard they thought the knob was glued on. Gentle but firm is the way to go.
Third, think about the feel and grip. If you’re a gigging musician, especially one who plays in hot or humid conditions, you know how slippery a plastic knob can get. Knobs with a rubberized coating or a textured surface offer much better grip. While they might not look as flashy as polished metal, their practicality is undeniable. I’ve seen many a guitarist fumbling with smooth metal knobs mid-song, looking like they’re trying to catch a greased pig. Stick with what gives you confident control.
Finally, when it comes to finding replacement knobs, don’t just stick to pedal-specific suppliers. Many electronics component suppliers, like Digi-Key or Mouser, sell a huge variety of knobs that can fit potentiometer shafts.
While you need to be careful about sizes, you can often find much more unique or industrial-looking options at a lower price point. For example, I found some fantastic, deep-skirted knobs from an industrial supplier that look absolutely killer on my MXR Micro Chorus. Just make sure you’re cross-referencing the shaft size (6mm, 6.35mm) and the shaft type (split, solid) with the knob’s specifications. (See Also: Are Spinner Knobs Illegal In California )
This broadens your search considerably and can save you a buck or two, while still answering the fundamental question: are MXR pedals 6mm knob, and if not, what else can I use?
| Pedal Model (Example) | Potentiometer Shaft Size (Typical) | Knob Type (Stock) | Verdict on Swapping | Recommendation |
|---|---|---|---|---|
| MXR Phase 90 (Reissue) | 6mm Split | Plastic, black | Easy | Standard 6mm knobs fit well. Consider rubberized for better grip. |
| MXR Carbon Copy | 6mm or 6.35mm Split (can vary) | Plastic, silver | Moderate | Measure carefully! Most aftermarket 6.35mm knobs fit all controls. |
| MXR Dyna Comp | 6mm Split | Plastic, silver | Easy | Plenty of 6mm options available. Look for vintage-style or colored knobs. |
| MXR Duke of Tone | 6mm Split | Plastic, small | Easy | Standard small-profile 6mm knobs are readily available. |
| Older MXR Flanger (Dunlop era) | Potentially non-standard (e.g., 5.5mm or different spline) | Plastic, black | Difficult | Measure with extreme precision or be prepared for slight modifications. |
Faqs: Your Burning Questions About Mxr Pedal Knobs
Are All Mxr Pedals 6mm Knob Shafts?
No, not all MXR pedals have 6mm knob shafts. While 6mm (or 6.35mm, which is often used interchangeably) split shafts are very common on many MXR pedals, especially their more modern and widely produced models, there can be variations. Older pedals, special editions, or less common models might use slightly different shaft sizes or even solid shafts. It’s always best to measure your specific pedal’s potentiometer shaft to be sure.
How Do I Measure My Mxr Pedal’s Knob Shaft Size?
To measure your MXR pedal’s knob shaft size, gently pull the existing knob straight off the potentiometer. Then, use a ruler or, ideally, a set of digital calipers to measure the diameter of the metal shaft. Note whether the shaft is split (the most common type for pedals) or solid. This measurement will tell you whether you need 6mm, 6.35mm, or another size knob.
Can I Use Knobs From Other Brands on Mxr Pedals?
Yes, you can often use knobs from other brands on MXR pedals, provided they are designed for the correct potentiometer shaft size and type. The key is matching the shaft diameter (e.g., 6mm, 6.35mm) and making sure it’s a split-shaft knob for a split-shaft potentiometer, or a solid-shaft knob for a solid-shaft potentiometer. Many aftermarket knobs are designed to fit standard pedal shafts from various manufacturers.
What If My Mxr Pedal Has a Non-Standard Knob Shaft Size?
If your MXR pedal has a non-standard knob shaft size, you have a few options. Your first step is to try and find knobs specifically advertised for that exact size and type of shaft. If that’s not possible, you might need to resort to minor modifications, such as using a small piece of paper or tape wrapped around the shaft to take up slack, or looking for universal fit knobs that come with adapters. However, these can be less secure and might not look as clean.
Where Can I Buy Replacement Knobs for Mxr Pedals?
You can buy replacement knobs for MXR pedals from a variety of sources. Online music retailers like Sweetwater, Reverb, and Amazon are good places to start. You can also find them from specialized pedal parts suppliers. For a wider selection of electronic components, including knobs, check out electronics distributors like Digi-Key or Mouser, though you’ll need to be more precise about specifications. Always check product descriptions for shaft size compatibility (6mm, 6.35mm split shaft) before purchasing.
Final Verdict
So, to finally put the question to bed: are MXR pedals 6mm knob? The most honest answer is ‘usually, but not always.’ It’s a common size, but MXR has a history of using variations, especially on older or limited-run pedals. My own experiences have shown me that a quick measurement with calipers or a ruler is your best friend here, saving you time and cash.
Don’t be like me in my early days, just guessing and buying blindly. Take a few minutes, pull off that existing knob, and measure the shaft. Whether it’s a vintage Dyna Comp or a brand-new pedal, knowing the exact size will make your knob-swapping adventure infinitely more successful and less frustrating. You’ll end up with a pedal that not only sounds great but looks and feels exactly how you want it to.
If you’re contemplating a knob upgrade, remember the practical tips: buy a few extra, use the right tools for tightening, and prioritize grip over pure aesthetics if you’re a gigging musician. Happy modding!
