
Photo 1
Can you turn a vintage Fender Vibrolux Reverb into a mini Super Reverb?
This month I've decided to forgo answering a question—not that I don't have plenty, and thank you for that, loyal readers. Instead we'll explore a mod to a blackface Fender Vibrolux Reverb and the thinking behind it. It's an easy and completely reversible that yields what I consider to be a more versatile amp.
Not long ago, a customer brought me a Vibrolux combo he'd recently acquired. He wanted to make it one of his regular gigging amps, so he asked me to make sure it was roadworthy. He wanted new caps, tubes, and whatever else was needed. He also wanted to remove and safely stash the original speakers while they were still in working condition. His idea was to thrash a new set of speakers on gigs and not be concerned about reliability or destroying a piece of Fender history.
Replacing speakers is actually a great upgrade for any amp of this era because speakers grow tired over the years, and a fresh set can yield a far greater improvement than most players would believe. In fact, when I install new speakers in an old amp, the owner typically experiences a wow moment. (If you have an older amp, try it—you might have that reaction too.)
Before I dive into repairing or modding an amp, I always ask how the owner expects to use it. For example: Do you like to play dirty, or are you after a big, clean tone with maximum headroom? This feedback gives me an idea of what type of tubes to install and how to tailor the circuit to the player.
It turned out this customer performs a lot of music inspired by Jonny Lang and Kenny Wayne Shepherd. Great—this gave me a reference and prompted me to offer some suggestions. We all know these players were very influenced by the late, great SRV.
Before I dive into repairing or modding an amp, I always ask how the owner expects to use it.
In my brief time working with Stevie before his death, I saw that his massive backline included two Fender Super Reverb combos, each loaded with four Electro-Voice 10s—his favorite speakers for these amps. How he managed to blow speakers with such massive power handling capability with a 40-watt Super is beyond me, but his tech at the time, the legendary René Martinez, always had spares on hand. Anyway, let's see what this knowledge can do for my customer.
First, a Vibrolux Reverb is a bit like a mini Super Reverb. With a dual-6L6 output stage, the amps offer about the same power, but the Vibrolux has two 10s instead of the Super's quad set. But they're voiced differently: While most blackface and silverface Fenders use the same value capacitors in the tone stack—a 250 pF, a 0.1 µF, and a 0.047 µF—the Super Reverb has a 0.022 µF cap in place of the 0.047 µF.
My suggestion was to modify the tone stack in the Vibrolux's first channel. This way, one channel would remain stock, the other would be a bit more like a Super, and he could use an A/B switch to access either channel as desired.
Regarding speakers: Unless you can afford a roadie, I wouldn't advise loading a Super or even a Vibrolux Reverb with EV 10s. These bad boys are heavy! Instead, I suggested swapping in a lighter set of contemporary 10s that sound similar to the EVs. The owner agreed, so let's look at what we did.
Photo 1 shows how I've installed not one but two new caps in the amp's first channel. I like replacing both the .047 and 0.1 µF caps with .022 µF caps. It makes the channel a bit beefier, and that's nice for a guitar with single-coil pickups. It also leans more towards a Marshall tone stack at this point ... but not quite. Of course, Stevie was also a Marshall guy (got to love those 200-watt Majors), so if you really want to go all the way, you can replace the 250 pF treble cap with a 470 pF, but that's not something I wanted from this particular amp.
Photo 2
Now, at this point I'm sure some of you are saying, "Yeah, cool, but there's no reverb on the first channel." Well my friends, I have a bonus for you. Look at Photo 2 and notice the blue wire. That's the audio signal wire from channel 1, which was originally connected to the circled eyelet on the right. Simply remove the wire from this connection at the input of the phase inverter and connect it to the input of the reverb drive circuit, as illustrated on the left of the photo. This routes the channel 1 signal to the reverb and tremolo circuits.
Photo 3
Cool—one more bonus! Finally, for just a little extra push, I like to move the unused 220k resistor and place it in parallel with the other 220k resistor at the input to the phase inverter (see photo).
After making these mods, I installed a new pair of 10" speakers (Photo 3), and the amp was ready for the road.
[Updated 9/1/21]
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Designed for players who demand flexibility without sacrificing tone, the Aquanaut fuses the rich warmth of classic analog delay with the extended range and clarity of modern digital designs. Featuring up to 600 milliseconds of delay time, the Aquanaut easily covers everything from tight slapback echoes to lush, ambient textures and rhythmic soundscapes – all with a simple, intuitive control layout.
Unlike many digital delays that can sound sterile and detached, the Aquanaut retains an organic, analog-inspired voice. Repeats are smooth and musical, gently fading into the mix to create depth and dimension without overwhelming your dry signal. Whether you’re chasing vintage tape echo, adding subtle space to your solos, or building massive atmospheric layers, the Aquanaut keeps your tone clear, present, and inspiring.
Berserker Electronics Aquanaut Delay/Echo
Key features include:
- Up to 600ms of delay time for expanded creative possibilities
- Analog-voiced digital architecture for warm, natural-sounding repeats
- Ambient-style echo that enhances, not distracts from, your core tone
- Simple, intuitive controls for delay time, feedback, and blend
The Aquanaut is available direct at www.berserkerpedals.com and Reverb at a $149 street price.
Stringjoy has introduced the Ariel Posen Signature String Set, a heavy-gauge Nickel Wound set designed in close collaboration with acclaimed slide guitarist and singer-songwriter Ariel Posen.
The Ariel Posen Signature String Set from Stringjoy
Ideal for B Standard, Open C, and other lower tunings, this set offers exceptional tone and feel for players who want to explore new sonic territory while maintaining their guitar's unique voice.
Each string in this set is built with Stringjoy’s trademark quality: wound at tension with high compression winds for maximum output, durability, and smooth playability. The result? Strings that hold up under pressure while delivering a natural, expressive voice—perfect for hybrid playing and expressive slide work.
Ariel Posen Signature Set Specs:
• .014 – .018p – .026w – .038 – .050 – .062
• Wound 3rd string
“If you didn’t know these were 14-62 gauges, you’d swear they were just 11s tuned down,” said Ariel Posen. “They feel like home and preserve the sound of the guitar, even in lower tunings. That’s the biggest thing—it still sounds like guitar.”
“We’ve spent ten years experimenting and testing together to find the right combination,” said Scott Marquart, Stringjoy Founder & President. “This release is more than just a new product—it’s the culmination of a shared journey between friends and musicians. Ariel’s set is uniquely him, and I think players will love how it feels and responds.”
Stringjoy’s Ariel Posen signature string set carry a street price of $13.99. Learn more at at stringjoy.com.
Paul Reed Smith cradles one of his company’s Charcoal Phoenix limited-edition guitars in front of a PRS Sonzera amp.
The storied guitar builder reflects on his dozen months sharing his experience, knowledge, and perspective with PG’s readers.
Over the past year, I’ve written a series of articles in Premier Guitar going over some of my, and our industry’s, views of guitar making. You can find all of them all online (and for those reading this online, the articles are collected here). What I am going to attempt to do for this final piece is boil down each of these articles to a “sort of” conclusion. I have enjoyed the process of writing and editing each one. For the most part, it’s been a lot of fun. So:
Tonewood Doesn’t Matter. Wood Does (August 2024)
We don’t use the word tonewood in conversation at PRS. It doesn’t capture a lot of my experience of which combinations of wood make good instruments. First and foremost, we are looking for qualities of wood over species, and we make sure we dry and treat each one appropriately.
What Makes a Guitar Worth the Price? (September 2024)
Very often, the price of a guitar does reflect how good an instrument is—and very often the price of the guitar has nothing to do with how good an instrument is.
What You Can and Can’t See When Buying a Guitar (October 2024)
This one’s a pet peeve. When making a purchase, you can clearly see the color of a guitar and how beautiful it is, but you have no idea if the neck is going to warp over time because of many factors, including wood drying and truss rod installment design. Trust your experience.
Does Where a Guitar Is Made Really Matter? (November 2024)
There are really good, really smart, really talented people all over the world. While I won’t deny it’s helped our career here at PRS being in the United States, I do not believe it is a truly defining factor of our quality. A good example would be the PRS SE Series.
The Complicated Beauty of Electric Guitar Pickups (December 2024)
We’ve taken so many good stabs at humbucking design, and I’m getting incredibly good feedback on our new McCarty IIIs. But making pickups is a complicated art. There are a lot of ingredients in the recipe.
“I hope these articles have had some positive impact on you as a group.”
In Guitar Making, It’s the Details that Matter (January 2025)
Well, that title says it. What’s interesting for me is that all guitar makers believe that different types of details matter more than others. At PRS, we have our own beliefs.
When Building Guitars—Or Pursuing Anything—Go Down All the Rabbit Holes (February 2025)
This one’s about learning. It’s a process I really enjoy. Whether your passion is guitar making, guitar playing, or something else entirely, there is always more to keep discovering.
Paul Reed Smith on Buying Gear (March 2025)
Very often at a clinic, the people who don’t play guitar have a less calcified view of the sound of the instruments being demonstrated than those players who have already developed strong ideas. On the other hand, one time a very experienced player was at one of my clinics and heard something he’d been looking for for a long time and did not expect it out of the guitar he got it from. Trust your experience—not your predetermined views.
Learning from the Mistakes of Guitar Building’s Past (April 2025)
I think my beginnings as a repairman gave me a lot of insight on this one. Even still, just the process of defining a past guitar-making mistake is its own art.
Paul Reed Smith on Where Amp History—and Tone—Begins (May 2025)
This one I love. It’s a greatly exaggerated version of mods you could do to a TS808 Tube Screamer, which has a history on the web. Amplifiers are “modulated power supplies” and can have so much impact on your tone.
The Lifelong Rhythm of Learning (June 2025)
In some periods of time, there’s a lot to be learned, and in some periods of time, you can barely hold what you had before. It’s different for everyone, and for me, it’s been up and down. No matter where you are in the process, there’s always good work to do.
I hope these articles have had some positive impact on you as a group. I know some things resonate with some people and not others, and the opposite as well. I haven’t gotten a lot of feedback from these articles except that there’s not an overwhelming chorus saying “what an idiot,” which I assume means there’s been some meat on the bone of some of the views shared. It’s been a joy. Thanks for listening.
Kemper updated the entire product range introducing the all-new Kemper Profiler MK 2 Series. More Power. More Flexibility.
KEMPER PROFILER - The all-new PROFILER MK 2 Series
Kemper today announces the immediate availability of the all-new KEMPER PROFILER MK 2 Series. Kemper continues to raise the bar with the upcoming Profiler MK 2 Series — a bold evolution of the Profiler lineup (All PROFILERs: Head, Rack, Stage, the Player, and the powered versions), delivering more power, more flexibility, and more creative potential than ever before.
At the heart of the PROFILER MK 2 Series works an upgraded processing engine, unlocking faster performance, with boot times clocking in around 20 seconds, and a host of new features that expand the boundaries of what a modern guitar or bass rig can do.
A New Era of Effects:
20 Blocks in Series, the most powerful effects architecture ever found in a Kemper unit - The PROFILER MK 2 Series now offers seven additional effect blocks, raising the total number of simultaneous audio effect blocks to an incredible 20 — all running with zero added signal latency. It’s like having an entire, fully integrated pedalboard with pedal essentials at your feet — but one that boots in seconds, never needs rewiring, and always remembers your settings.
A new Era of Profiling:
Kemper announces a new profiling technology for the MK 2 series. Availabilty is expected during Summer. Currently in extended testing with some selected third-party profile vendors the new profiling offers:
- More than 100,000 individual frequency points meticulously analyzed for the most precise amp recreation ever achieved.
- Next-Level Speaker & Dynamically adjustable Cabinet Resonance – Capturing the true dynamics of your setup with the longest and most complex impulse responses in the industry.
- Liquid Profiling Technology – Seamlessly integrate the original amp’s gain and tone controls, transforming a single profile into a fully dynamic, living amplifier.
- Unparalleled Precision & Feel – A cutting-edge hybrid approach combining precise, deterministic analog measurement with Kemper’s industry-leading profiling intelligence.
Overview - All that’s new in the PROFILER MK 2 in more Detail:
All-New FX Section – 7 Additional FX Slots - ThePROFILER MK 2-Series introduces an expanded FX section with seven dedicated “pedalboard essential” FX slots, featuring: A new second Noise Gate (Palm Ninja), Compressor, Pure Booster, WahWah, Vintage Chorus, Air Chorus, and Double Tracker.
Adding these to the pre-existing 10 audio blocks, Spectral Noise Gate, Transpose Effect, and Volume Pedal - in total this provides users with 20 simultaneous audio effect blocks, setup gig-ready right out of the box while maintaining full flexibility for customization.
This new layout makes it convenient to cover all the bases and offers 8 flexible FX blocks available for the acclaimed tone shapers and studio-grade unique FX the KEMPER PROFILER is famous for.
Performance Meets Portability - With a smarter internal design and new lightweight aluminum components, the Profiler Stage Mk 2 has shed excess weight — making it even more gig-friendly without sacrificing the tank-like build quality musicians rely on. Whether for touring the world or heading to a local session, this is the most travel-ready full-featured Profiler yet.
Mk 2-ready Player! - For all guitarists and bassists already rocking the compact PROFILER Player, there is good news: it’s been “MK 2”-ready from day one, meaning it’s fully aligned with the power and potential of the new series, and now, on LVL 1 already, it features 16 simultaneous FX in total. This new extended signal flow becomes available for all Player owners as a free update, and yes, it will get Profiling, too. Making the PROFILER Player out of the box the features richest and most professional performance and recording solution - with its travel-friendly footprint and convenient price point!
8-Channel USB Audio Support for the new Mk 2-Series - Native 8-channel USB audio support to all KEMPER PROFILER MK 2 Series units, enabling seamless multitrack recording and reamping directly into your DAW – no external interface required.
Loop Longer, Play Harder - The integrated Looper also gets a serious upgrade. With up to two full minutes of recording time, the MK 2 Series lets you capture extended phrases, build layered soundscapes, or craft entire performances — all on the fly. (Looper available from LVL 3 for the Player)
Speed and Responsiveness Upgrades - Major improvements under the hood. Boot times, preset switching, and UI responsiveness are noticeably faster and smoother, especially in Performance Mode.
Christoph Kemper, Founder & CEO:
“The new PROFILER MK 2-Series makes the PROFILERs feel more like a complete rig than ever before. With instant access to essential FX, full USB audio integration, and improved playability, we’re giving our users a platform that adapts and grows with them.”
Pricing & Availability:
The new KEMPER PROFILER MK 2 Series models are available now from dealers worldwide and directly from the Kemper Online Store. All the new features require a KEMPER PROFILER MK 2 Series device. Visit www.kemper-amps.com for downloads and release notes.
PROFILER Head $1,348.00
PROFILER Rack $1,398.00
PROFILER Stage $1,498.00
PROFILER Player $ 699.00
PROFILER PowerHead $1,798.00
PROFILER PowerRack $1,798.00
PROFILER Remote $ 469.00
At a glance!
The Kemper Profiler MK 2 Series isn’t just about doing more. It’s about doing it better, faster, and without compromise. With unmatched tonal power, surgical precision, and effortless usability, this is the most complete and forward-thinking Profiler platform yet.