When we left off last month, we had a neck where the tops of all of the frets were level, flat (no longer rounded), and had big scratches on them (yikes!).
When we left off last month, we had a neck where the tops of all of the frets were level, flat (no longer rounded), and had big scratches on them (yikes!). If you were to play the guitar at this point, it would feel like the frets were made of sandpaper, so obviously this situation needs to be addressed.
The fact that the frets are flat on top isn''t good either. Assuming the frets are .050" - .100" wide, having them flat on top could alter the string length by .025" - .050", which is enough to throw off your intonation.
Hmmm... does this require additional explanation? Yes?
Let''s discuss scale length. Scale length is the length of the "vibrating portion" of your strings (from the fretboard-side of the nut to the saddle). On a Strat, this is 25.5 inches before intonation compensation. The width of each interval on the fingerboard is calculated based on this measurement, to 3 or 4 decimal places, using a logarithmic formula:
25.5 / 17.817 = 1.431" (width of first interval, or fret)
25.5 - 1.431 = 24.069 (remainder of scale)
24.069 / 17.817 = 1.351" (width of second interval, or fret)
24.069 - 1.351 = 22.718 (remainder of scale)
22.718 / 17.817 = 1.275" (width of third interval, or fret)
22.718 - 1.275 = 21.443 (remainder of scale)
And so on, and so forth. The reason the fret placement is calculated so precisely (and the fret slots cut correspondingly precisely, at least on good guitars) is because you would hear it if they weren''t. The guitar would be out of tune to the degree that the fret placement was off. Even a small amount, like .025" (25 thousandths of an inch) would be noticeable - you would hear the notes beating against each other. Beating is that "throbbing" you sometimes hear between two notes, especially with distortion.
The accurate fret placement is only effective if the top of the fret corresponds to the position of the slot itself. If the fret is round on top, the string makes contact in the middle of the fret, in line with the middle of the slot. Hog off the top of the fret so it''s flat on top, and now the edge of the fret, where the string "breaks", is off from the centerline by up to .050". As you move up the fretboard, this error is compounded because the .050" (or whatever it is) becomes a larger and larger percentage of the remaining string length.
So it''s important that the frets remain round on top. But our frets are flat on top.
So we need to round them. We can do this with abrasives or files. The idea is to round the shoulders of each fret without removing any material from the top. Let''s qualify this by saying that we are only concerned with the section down the middle of the top (where the strings will ultimately make contact), because we spent so much time leveling the tops last month. The last thing we want to do at this point is remove material from this section. The easiest way to do this consistently is with markers and crowning files.
If we mark the tops of the frets with a marker, we can see at a glance if any material gets removed from them. Then we can use a crowning file to remove the shoulders (the square edges) while monitoring the marked tops to make sure that the marker is not removed down the center of the tops. A crowning file''s narrow edges have a groove milled or formed in them. This groove has teeth cut in it (or is coated with industrial diamond), so that it will leave a convex edge on a surface as it cuts. As the file is passed over a fret, this groove begins to knock off the corners, turning the top from a flat surface back to a rounded surface. Careful monitoring of the marked tops and an experienced hand will result in frets that have the merest sliver of marker remaining down the center of each fret, ensuring that they are nearly perfectly rounded, but that the tops are still level.
Whew! That''s it for this month. Next month, we''ll pick back up and finish this topic once and for all with the final step: polishing.
Acme Guitar Works sells electronic components for electric guitars, including complete, prewired assemblies. Visit them at acmeguitarworks.com.
This legendary vintage rack unit will inspire you to think about effects with a new perspective.
When guitarists think of effects, we usually jump straight to stompboxesātheyāre part of the culture! And besides, footswitches have real benefits when your hands are otherwise occupied. But real-time toggling isnāt always important. In the recording studio, where weāre often crafting sounds for each section of a song individually, thereās little reason to avoid rack gear and its possibilities. Enter the iconic Eventide H3000 (and its massive creative potential).
When it debuted in 1987, the H3000 was marketed as an āintelligent pitch-changerā that could generate stereo harmonies in a user-specified key. This was heady stuff in the ā80s! But while diatonic harmonizing grabbed the headlines, subtler uses of this pitch-shifter cemented its legacy. Patch 231 MICROPITCHSHIFT, for example, is a big reason the H3000 persists in racks everywhere. Itās essentially a pair of very short, single-repeat delays: The left side is pitched slightly up while the right side is pitched slightly down (default is ±9 cents). The resulting tripling/thickening effect has long been a mix-engineer staple for pop vocals, and itās also my first call when I want a stereo chorus for guitar.
The second-gen H3000S, introduced the following year, cemented the deviceās guitar bona fides. Early-adopter Steve Vai was such a proponent of the first edition that Eventide asked him to contribute 48 signature sounds for the new model (patches 700-747). Still-later revisions like the H3000B and H3000D/SE added even more functionality, but these days itās not too important which model you have. Comprehensive EPROM chips containing every patch from all generations of H3000 (plus the later H3500) are readily available for a modest cost, and are a fairly straightforward install.
In addition to pitch-shifting, there are excellent modulation effects and reverbs (like patch 211 CANYON), plus presets inspired by other classic Eventide boxes, like the patch 513 INSTANT PHASER. A comprehensive accounting of the H3000ās capabilities would be tedious, but suffice to say that even the stock presets get deliciously far afield. There are pitch-shifting reverbs that sound like fever-dream ancestors of Strymonās āshimmerā effect. There are backwards-guitar simulators, multiple extraterrestrial voices, peculiar foreshadows of the EarthQuaker Devices Arpanoid and Rainbow Machine (check out patch 208 BIZARRMONIZER), and even button-triggered Foley effects that require no input signal (including a siren, helicopter, tank, submarine, ocean waves, thunder, and wind). If youāre ever without your deck of Oblique Strategies cards, the H3000ās singular knob makes a pretty good substitute. (Spin the big wheel and find out what youāve won!)
āIf youāre ever without your deck of Oblique Strategies cards, the H3000ās singular knob makes a pretty good substitute.ā
But thereās another, more pedestrian reason I tend to reach for the H3000 and its rackmount relatives in the studio: I like to do certain types of processing after the mic. Itās easy to overlook, but guitar speakers are signal processors in their own right. They roll off high and low end, they distort when pushed, and the cabinets in which theyāre mounted introduce resonances. While this type of de facto processing often flatters the guitar itself, it isnāt always advantageous for effects.
Effects loops allow time-based effects to be placed after preamp distortion, but I like to go one further. By miking the amp first and then sending signal to effects in parallel, I can get full bandwidth from the airy reverbs and radical pitched-up effects the H3000 can offerāand I can get it in stereo, printed to its own track, allowing the wet/dry balance to be revisited later, if needed. If a sound needs to be reproduced live, thatās a problem for later. (Something evocative enough can usually be extracted from a pedal-form descendant like the Eventide H90.)
Like most vintage gear, the H3000 has some endearing quirks. Even as it knowingly preserves glitches from earlier Eventide harmonizers (patch 217 DUAL H910s), it betrays its age with a few idiosyncrasies of its own. Extreme pitch-shifting exhibits a lot of aliasing (think: bit-crusher sounds), and the analog Murata filter modules impart a hint of warmth that many plug-in versions donāt quite capture. (They also have a habit of leaking black goo all over the motherboard!) Itās all part of the charm of the unit, beloved by its adherents. (Well, maybe not the leaking goo!)
In 2025, many guitarists wonāt be eager to care for what is essentially an expensive, cranky, decades-old computer. Even the excitement of occasional tantalum capacitor explosions is unlikely to win them over! Fortunately, some great software emulations existāEventideās own plugin even models the behavior of the Murata filters. But hardware offers the full hands-on experience, so next time you spot an old H3000 in a rack somewhereāand youāve got the timeāfire it up, wait for the distinctive āclickā of its relays, spin the knob, and start digging.
Two Iconic Titans of Rock & Metal Join Forces for a Canāt-Miss North American Trek
Tickets Available Starting Wednesday, April 16 with Artist Presales
General On Sale Begins Friday, April 18 at 10AM Local on LiveNation.com
This fall, shock rock legend Alice Cooper and heavy metal trailblazers Judas Priest will share the stage for an epic co-headlining tour across North America. Produced by Live Nation, the 22-city run kicks off September 16 at Mississippi Coast Coliseum in Biloxi, MS, and stops in Toronto, Phoenix, Los Angeles, and more before wrapping October 26 at The Cynthia Woods Mitchell Pavilion in The Woodlands, TX.
Coming off the second leg of their Invincible Shield Tour and the release of their celebrated 19th studio album, Judas Priest remains a dominant force in metal. Meanwhile, Alice Cooper, the godfather of theatrical rock, wraps up his "Too Close For Comfort" tour this summer, promoting his most recent "Road" album, and will have an as-yet-unnamed all-new show for this tour. Corrosion of Conformity will join as support on select dates.
Tickets will be available starting Wednesday, April 16 at 10AM local time with Artist Presales. Additional presales will run throughout the week ahead of the general onsale beginning Friday, April 18 at 10AM local time at LiveNation.comTOUR DATES:
Tue Sep 16 ā Biloxi, MS ā Mississippi Coast Coliseum
Thu Sep 18 ā Alpharetta, GA ā Ameris Bank Amphitheatre*
Sat Sep 20 ā Charlotte, NC ā PNC Music Pavilion
Sun Sep 21 ā Franklin, TN ā FirstBank Amphitheater
Wed Sep 24 ā Virginia Beach, VA ā Veterans United Home Loans Amphitheater
Fri Sep 26 ā Holmdel, NJ ā PNC Bank Arts Center
Sat Sep 27 ā Saratoga Springs, NY ā Broadview Stage at SPAC
Mon Sep 29 ā Toronto, ON ā Budweiser Stage
Wed Oct 01 ā Burgettstown, PA ā The Pavilion at Star Lake
Thu Oct 02 ā Clarkston, MI ā Pine Knob Music Theatre
Sat Oct 04 ā Cincinnati, OH ā Riverbend Music Center
Sun Oct 05 ā Tinley Park, IL ā Credit Union 1 Amphitheatre
Fri Oct 10 ā Colorado Springs, CO ā Broadmoor World Arena
Sun Oct 12 ā Salt Lake City, UT ā Utah First Credit Union Amphitheatre
Tue Oct 14 ā Mountain View, CA ā Shoreline Amphitheatre
Wed Oct 15 ā Wheatland, CA ā Toyota Amphitheatre
Sat Oct 18 ā Chula Vista, CA ā North Island Credit Union Amphitheatre
Sun Oct 19 ā Los Angeles, CA ā Kia Forum
Wed Oct 22 ā Phoenix, AZ ā Talking Stick Resort Amphitheatre
Thu Oct 23 ā Albuquerque, NM ā Isleta Amphitheater
Sat Oct 25 ā Austin, TX ā Germania Insurance Amphitheater
Sun Oct 26 ā Houston, TX ā The Cynthia Woods Mitchell Pavilion
*Without support from Corrosion of Conformity
MT 15 and Archon 50 Classic amplifiers offer fresh tones in release alongside a doubled-in-size Archon cabinet
PRS Guitars today released the updated MT 15 and the new Archon Classic amplifiers, along with a larger Archon speaker cabinet. The 15-watt, two-channel Mark Tremonti signature amp MT 15 now features a lead channel overdrive control. An addition to the Archon series, not a replacement, the 50-watt Classic offers a fresh voice by producing retro rock āclassicā tones reminiscent of sound permeating the radio four and five decades ago. Now twice the size of the first Archon cabinet, the Archon 4x12 boasts four Celestion V-Type speakers.
MT 15 Amplifier Head
Balancing aggression and articulation, this 15-watt amp supplies both heavy rhythms and clear lead tones. The MT 15 revision builds off the design of the MT 100, bringing the voice of the 100ās overdrive channel into its smaller-format sibling. Updating the model, the lead channel also features a push/pull overdrive control that removes two gain stages to produce vintage, crunchier āmid gainā tones. The clean channel still features a push/pull boost control that adds a touch of overdrive crunch. A half-power switch takes the MT to 7 watts.
āSeven years ago, we released my signature MT 15 amplifier, a compact powerhouse that quickly became a go-to for players seeking both pristine cleans and crushing high-gain tones. In 2023, we took things even further with the MT 100, delivering a full-scale amplifier that carried my signature sound to the next level. That inspired us to find a way to fit the 100's third channel into the 15's lunchbox size,ā said Mark Tremonti.
āToday, Iām beyond excited to introduce the next evolution of the MT15, now featuring a push/pull overdrive control on the Lead channel and a half-power switch, giving players even more tonal flexibility to shape their sound with a compact amp. Canāt wait for you all to plug in and experience it!ā
Archon Classic Amplifier Head
With a refined gain structure from the original Archon, the Archon Classicās lead channel offers a wider range of tones colored with gain, especially in the midrange. The clean channel goes from pristine all the way to the edge of breakup. This additional Archon version was developed to be a go-to tool for playing classic rock or pushing the envelope into modern territory. The Archon Classic still features the originalās bright switch, presence and depth controls. PRS continues to stock the Archon in retailers worldwide.
āThe Archon Classic is not a re-issue of the original Archon, but a newly voiced circuit with the lead channel excelling in '70s and '80s rock tones and a hotter clean channel able to go into breakup. This is the answer for those wanting an Archon with a hotrod vintage lead channel gain structure without changing preamp tube types, and a juiced- up clean channel without having to use a boost pedal, all wrapped up in a retro-inspired cabinet design,ā said PRS Amp Designer Doug Sewell.
Archon 4x12 Cabinet
As in the Archon 1x12 and 2x12, the mega-sized PRS Archon 4x12 speaker cabinet features Celestion V-Type speakers and a closed-back design, delivering power, punch, and tight low end. Also like its smaller brethren, the 4x12 is wrapped in durable black vinyl and adorned with a British-style black knitted-weave grill cloth. The Archon 4x12 is only the second four-speaker cabinet in the PRS lineup, next to the HDRX 4x12.
PRS Guitars continues its schedule of launching new products each month in 2025. Stay tuned to see new gear and 40 th Anniversary limited-edition guitars throughout the year. For all of the latest news, click www.prsguitars.com/40 and follow @prsguitars on Instagram, Tik Tok, Facebook, X, and YouTube.
For two decades, Clapton's Choice Signature Strings have delivered the legendary tone Eric Clapton relies on every time he picks up an acoustic guitar. To celebrate this milestone, Martin Guitar is introducing limited-edition 20th anniversary packaging for these fan-favorite strings--available now through March 2026.
Every limited-edition pack also gives players a chance to win a Martin 000-EC 30th Anniversary guitar--a beautifully crafted instrument with a retail value of $4,999, inspired by the Martin guitars Eric played during his legendary MTV Unplugged performance. The guitar will be awarded to one lucky winner who finds a special ticket inside a pack of strings.
Fans can also enter a second-chance giveaway online for more opportunities to win exclusive prizes, including a Martin guitar strap, poster, collectible lanyard with three custom patches, or even a year's supply of strings.This contest is open to U.S. residents only and ends March 31, 2026. No purchase necessary.
Enter now and learn more at martinguitar.com/eric-clapton-giveaway.
The anniversary release also coincides with the upcoming arrival of Unplugged: Enhanced Edition on vinyl and CD, available May 9. The iconic installment of the MTV Unplugged series--and the greatest-selling live album of all time--returns over 30 years later in an all-new extended, remixed, and remastered version. Featuring never-before-heard commentary from Eric recorded just before the original 1992 performance, the release offers fresh insight into the inspiration behind the songs and includes tracks not featured in the original MTV airing.
Crafted from 92/8 phosphor bronze, Claptonās Choice Signature Strings are known for their warm, rich tone, smooth feel, and long-lasting performance. They're the same strings Eric uses in the studio and on stage--including during his current eight-night residency at the Nippon Budokan in Tokyo--and he calls them "the sound that I demand."
Whether you're chasing Eric's iconic tone or simply looking for strings that deliver great sound and playability, now is the perfect time to pick up a pack--available in a music store near you or online at
martinguitar.com--and celebrate two decades of signature sound.