Interested in plugging a flattop into your favorite silver- or black-panel beauty? Here’s what you need to know.
Have you ever tried to plug your acoustic guitar into a classic-style Fender amp? There are some hurdles to overcome, and this month I’ll provide some advice on how to get past them. But first, some background.
Amps made for electric guitars are carefully designed and matched to the voltages and frequency profiles of signals delivered by electromagnetic pickups. An amp sounds best when it does a good job at amplifying or filtering out certain frequencies. So many of us have stumbled upon challenges when the input signal—say from an acoustic guitar or other instrument—is way different than what the amp expects.
A guitar signal is initially created by moving the strings. The more vibrating metal mass closer to the pickup’s magnet, the more magnetic pull and more current is induced inside the coil wire in the pickups. More windings and stronger magnets induce more current, but also reduce brightness and clarity. The coil-wire thickness, wire material, and coating material and thickness also play a role in signal strength and frequency response. The signal voltage produced by a pickup is low—typically between 0.1 and 1V—and contains frequencies between 80 and 1200 Hz.
On the amp side, there are even more factors that amplify or weaken certain frequencies—so-called frequency filtering. Take a vintage Fender Deluxe Reverb. It is designed with specific tubes, resistors, and caps in the preamp stage to amplify a weak input signal and shape it through EQ, mix in some reverb, and transport the result to the power amp circuit, which does three things. First, it splits and duplicates that result into an inverted signal, then it amplifies the two signals as much as possible, and then feeds them into each side of a power transformer that alters the resulting voltage to a suitable level for a loudspeaker. That’s typically 30 to 50V. The speaker cabinet and loudspeaker itself are the final stage in delivering a filtered and amplified guitar tone.
For acoustic guitars I prefer modern American-style speakers that can handle high power and both a firm bass response and a crisp top end.
If you hook up other instruments, like an acoustic guitar or a harmonica with a microphone, and feed an electric guitar amp their signals, you will get totally different results throughout the circuit. You may not get the tone you expect, or, in the worst case, you might damage the amp. But generally, all passive sources with electromagnetic coil pickups are safe to use. This includes piezo pickups mounted to the bridge of an acoustic guitar and vocal microphones. Since they are not powered by an external source like a 9V battery, they are passive and create a weak signal.
You should be careful using electrically powered sources like an acoustic guitar with a battery-powered preamp and EQ. Also, electric pianos, synthesizers, or Bluetooth speakers with mini-jack outputs are dangerous, too, since they can easily blow the loudspeakers due to a wrong volume or EQ setting. Electric pianos can sound very good through a vintage Fender amp. I’ve seen Fender Rhodes keyboards played through Twin Reverbs, and we’ve all heard organs through Leslie/Vibratone speakers, which can be run by Fender guitar amps.
Acoustic guitars with active pickups can be difficult. With typical default amp settings for electric guitar, the tone is narrow and focused around certain mid frequencies. It lacks fullness, top-end clarity, and overall balance. So, I have some tricks you should try if you’re experimenting with this option. First, set all the EQ knobs to 10. This allows the guitar signal to travel through the preamp section with minimum change of tone. Be very careful with volume and start low—at around 1.5—and increase from there. I find big, powerful Fender amps are best for this, since they have plenty of clean headroom and wide EQ possibilities with a full set of bass, mid, treble, and bright-switch controls. And that makes them less prone to howling feedback.
A big speaker cabinet will enhance the low end, allowing the preamp and power amp to relax more without maxing out clean headroom. Remember that the power and energy lie in the bass. I suggest the silver-panel 40-watt Bandmaster Reverb and 85-watt Showman Reverb as practical amp heads for acoustic purposes. I use my Bandmaster Reverb with a 1x12 extension cabinet loaded with an Eminence Maverick. For acoustic guitars, I prefer modern American-style speakers that can handle high power and both a firm bass response and a crisp top end. Speakers are very important for your tone. The guitar’s pickups are also important, together with a correct setup, so the action permits the optimum proximity of the pickups.
Acoustic pickups don’t have to be expensive. They just need to be balanced and clear. A good guitar amp and some careful adjustments of the controls will do the rest.
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A lightweight, portable amp series developed after months of forensic examination of vintage valve amps.
The St. James series offers amps in two formats: an EL34 design creating classic British rock tones and a 6L6 model with crystal clean tones and higher gain, both available as Celestion-equipped combo or amplifier head with matching vertical 212 cabinet. Designed to be simple to use but highly versatile, these amps offer an intuitive two-channel setup that delivers Blackstar’s best-ever clean and overdrive tones.
These amps are ideal for gigging players in search of a great-sounding valve amp at less than half the weight of traditional valve-driven amplifiers, as well as studio players looking for elite tone with the convenience of built-in tools used for recording applications. The models’ light weight is attributable to several factors in construction and design, namely the candlenut wood cabinet and custom Celestion Zephyr speaker, all without sacrificing the all-valve signal path creating the sound and feel of a traditional valve amplifier.
All four amp models feature two-channel 12AX7 preamp tube circuitry, along with three power switch options to fit the user’s need:
- the 50W full power setting, offering the loudest clean headroom;
- the SAG setting, proving the softer, vintage-feeling dynamic compression of a power supply ‘”sag,” most noticeable on the loud transients (attack) of the sweetest tube amps;
- and a 2W low power setting for recording or smaller gigs, delivering a more overdriven power amp tone by controlling HT (high voltage) and bias in the power stage, delivering a more natural tone than the usual “power soak” load resistor method often used.
See How These Players Reacted to St. James | St. James | Blackstar
For more information, visit: www.blackstaramps.com. Blackstar will be exhibiting at Booth 5723 (Hall D) at The NAMM Show, June 3-5, 2022, in Anaheim, CA.
U.S. MAP pricing is as follows:
- St James 50 Watt 6L6 Combo Amp: $1299.99
- St James 50 Watt 6L6 Amp Head: $1199.99
- St James 50 Watt EL34 Combo Amp: $1299.99
- St James 50 Watt EL34 Amp Head: $1199.99
- St James Vertical 212 Cabinet Black: $749.99
- St James Vertical 212 Cabinet Fawn: $749.99
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May 11, 2022
Megadeth founder teams up with Gibson for his first acoustic guitar in the Dave Mustaine Collection.
For the new acoustic guitar, Gibson acoustic luthiers in Bozeman, Montana collaborated with Dave Mustaine the legendary guitarist, vocalist, songwriter, and founder of the multi-platinum selling and Grammy Award-winning band, Megadeth. The Gibson Dave Mustaine Songwriter in Ebony is available in a both a standard version and a limited edition model, signed by the artist. Part of the Dave Mustaine Collection, the new Dave Mustaine Songwriter in Ebony is the first 24-fret neck ever installed on a Gibson acoustic guitar. With a slightly thinner walnut body, the Dave Mustaine Songwriter guitar features a cutaway for easy access to the upper frets.
Megadeth has gone on to sell more than 50 million albums worldwide, earning many accolades along the way, including a Grammy Award for the title track from their most recent album Dystopia, along with 12 additional Grammy nominations, as well as five consecutive platinum/multi-platinum albums. Megadeth has headlined many of the biggest stages in the world and recently played their most successful tour ever, closing every night on the North American amphitheater “Metal Tour of the Year”. Also, a New York Times bestselling author and sought after speaker, host, and commentator, Mustaine has remained a standard bearer for metal and heavy guitar rock, combining a musical and technical standard with the punk and rock n’ roll ethos and attitude.
Icons: Dave Mustaine of Megadeth
Explore the new Dave Mustaine Songwriter in Ebony, www.gibson.com.
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