Grissom and Paul Reed Smith’s first collaboration appeared in 2007 in the shape of theGrissom DGT—a signature instrument that’s seenmany iterations since. His Custom 30 amplifier followed five years later. But at 30 watts, that amp is pretty powerful for a lot of folks. So, this year PRS and their lead amp designer, Doug Sewell, unveiled the more club-friendly, tremolo-equipped DGT 15.
The basic architecture of the Indonesia-built DGT 15—single-channel, 2 x EL84 power section, 15 watts, and onboard reverb and tremolo—bears more than a little resemblance to a few important ’60s combo amps. But its 3-band EQ with presence, top-cut, and bright boost controls lends a lot of additional functionality and flexibility without cluttering the control panel or the playing experience. And, unlike some classic amps in this power class, the DGT 15 generates its wallop from a pair of output tubes in cathode bias, driven by three 12AX7s and one 12AT7 in the front end.
Feature Length
If the DGT 15’s control set were made up of just the EQ, presence, and top-cut controls, it would offer impressive tone-sculpting power. But the 3-way bright, boost, and master volume switches add exponentially more colors and gain contrasts. The bright switch is clever. It can be switched to always-on mode or set to disengage when the boost is on. The footswitchable boost, meanwhile, gives the single-channel DGT-15 the flex of a two-channel amp with a lead mode. Better still, you can set the amp up so you can activate the boost and master volume together—enabling access to the most headroom with the boost off and keeping the gain from running wild when the boost is engaged. The tremolo, too, can be activated via a mini-toggle or the included footswitch.
“While it’s basically clear, round, and full, depending on where you set the powerful EQ controls, you can reshape those tones into chunky, chiming, or sparkly variations on the clean theme.”Because the DGT-15 is cathode biased, the output tubes require no re-biasing when you change them. But the back panel includes jacks for monitoring bias levels, which is handy for matching tubes or diagnosing possible issues. The back panel is also home to the 5-pin DIN footswitch jack and three speaker outs for various combinations of 4 ohm, 8 ohm, or 16 ohm cabs. Our test unit came with the ported-back PRS DG 1x12 cabinet, which is loaded with one 60-watt Celestion Vintage 30. The DGT 15 head itself is a little bigger than lunchbox-sized (unless you’ve got a particularly hefty appetite). But it’s still an easy load at just 17.25" x 9" x 9.25" and a hair under 20 pounds. The 1x12" cab is relatively compact too, at 24" x 22.18" x 10.5", and weighs 27 pounds.
Tejas Tone!
If you read only the specs for the DGT 15 (or never had the pleasure of playing a Custom 30), you’ll probably expect a British voice. But the DGT 15’s core tonality leans as much toward the 1960s black-panel Fender camp, and it has a ready-to-rumble personality that shines through whether you match it to an ES-355 or a Telecaster.
With Fender single-coils in the mix, non-boosted settings are very clean right up to around 3 o’clock on the volume, where the amp starts to edge into breakup just a little. That’s a lot of clean room to roam. But while it’s basically clear, round, and full, depending on where you set the powerful EQ controls you can reshape those tones into chunky, chiming, or sparkly variations on the clean theme. Humbuckers push the DGT 15 to juicier, crunchier zones much sooner, of course. Even so, the amp remains crisp and taut without going muddy. With both single-coils and humbuckers, the overdrive and saturation generated by the boost avoid the sizzly sounds you hear from many modern lead channels and overdrives. It’s also very dynamic—easing into light distortion when you pick hard, and shedding its aggressive edge when you use a light touch or reduce guitar volume. Overdrive pedals (in this case, a Klon-like Wampler Tumnus Deluxe, Marshall-style Friedman Small Box, and a multi-voiced Tsakalis Six) gel with both the boost and clean modes, too. The reverb and tremolo are superb. The range of both successfully spans subtle and more radical sounds—and between these, a couple of drive pedals, and the Boost function, a gigging guitarist can wrangle a lot of flexibility out of this amp.
The Verdict
Using the single-channel, 2 x EL84/reverb/tremolo architecture as a jumping-off point, the DGT 15 scales new heights of versatility—not just via flexible switching and tone-shaping power, but by melding Vox-y edge with Fender clarity and body at a very accessible price.
Tim Pierce’s guitar can be heard on more than a thousand recordings, starting in the ’80s, when he played on hits by Bon Jovi, John Waite, and Rick Springfield. In subsequent years, he’s added to his resume with recorded performances for Crowded House, Christina Aguilera, Seal, Avril Lavigne, Tracy Chapman, Joe Cocker, Ricky Martin, Meat Loaf, Rod Stewart, Elton John, Michael Jackson, Bruce Springsteen, Rob Thomas, Rick Springfield, Phil Collins, Madonna, Toy Matinee, Don Henley, Santana, Rascal Flatts, Chris Isaak, Jewel, Faith Hill, Celine Dion, Dave Matthews Band, the Goo Goo Dolls, Lana Del Ray, Demi Lovato, Jason Mraz, Kelly Clarkson, and many more.
These days, Pierce also has a popular YouTube channel with more than 400,000 subscribers and offers an online masterclass program for thousands of users. You can get more information at timpierceguitar.com.
Meanwhile, here’s what we saw—and learned—when Pieces shared the wisdom and the gear he’s accumulated in four decades of playing sessions.
Brought to you by D’Addario XS Strings.
Tim’s Troupe
Here’s a look at Tim Pierce’s go-to instruments, including a 1962 ES-335, a 2020 Gibson Custom Shop 1960 Les Paul reissue with Arcane humbuckers, a one-off PRS McCarty 594 Singlecut in black with binding, and a ’62 Fender Jaguar strung with flatwounds.
Ol’ ’35
After nearly four decades of sessions, Pierce has pretty much every tool for any job. His heavy rotation includes this 1962 Gibson ES-335, which has enough wear to be considered “player grade,” with Ron Ellis pickups. Most of Tim’s electric guitars are strung with Elixir nanoweb strings, either .009 through .042, or .010 through .046.
Green Machine
This 2022 Mario hardtail S-style with a paulonia-wood body weighs a mere 4 pounds 13 ounces!
The Right Stripe
You’d be hard pressed to find a more beautiful flame top than this 2019 PRS McCarty Flame Top Doublecut. It sports a carved flame maple top on a mahogany body, a rosewood fretboard, two volumes, two push-pull tone controls, and a 3-way switch.
Marshall Power
Pierce has a lot of amps to choose from in his control room, including this 1967 Marshall Super PA 100 head (top) and 1968 Marshall Super Tremolo plexi.
A Park, Divided
There’s also a Park JTM 45-100 from a limited run of 10 and a Divided by 13 RSA 23 head, with 23 watts, natch.
More Amped Up
Rounding out the lineup of Pierce’s amplifiers is a Bad Cat Lynx, a Bad Cat Hot Cat, and a Joe Morgan custom 15 head (not pictured).
That’s 16 x 48
Pierce’s amp cabs live in a separate, sealed room, built specifically for isolation, far from the control room. They include these four vintage Marshall 4x12 cabinets, dating from 1968 through the early 1970s. There’s also a vintage Vox 2x12 with 15W Bulldogs.
He keeps his cabs miked with Shure SM57s, two Royer R-122V tube ribbon microphones, and two Sony C800 large diaphragm condensers from the early ’90s. A Scheops CMC5 condenser microphone is used for acoustic guitars.
Tim Pierce's Pedalboard
Pierce began the interview playing though his main mobile Pedal Board, which includes a Nobels ODR-1, a Strymon Lex rotary, a Keeley/Timmons Halo delay, a Meris LVX delay, a Karma MTN-10 overdrive, an XTS Modded Boss GE-7 equalizer and Boss TR-2 Tremolo, a vintage Boss VB-2 Vibrato, an MXR Reverb, a Fairchild Circuitry Shallow Water modulation pedal, a Providence System Tuner, two Dunlop mini expression pedals, a Dunlop volume pedal, a Voodoo Lab Dingbat pedalboard, and a Voodoo Lab Pedal Power Mondo.
Pedal Muscle, Part II
While in his studio cockpit, these are Pierce’s effects, which you can hear him play in his online videos: Ibanez MT10 Mostortion, Vemuram ODS-1, Nobels ODR-1, MXR Boost/Line Driver, Way Huge Red Llama, Boss OC-2 Octave, Boss VB-2 Vibrato, Way Huge Supa-Puss Analog Delay, Fender MTG Tube Tremolo, Universal Audio Golden Reverberator, Neon Egg Planetarium 3, Ebo E-verb, three Eventide H9s used with the iPad App, and a Boomerang Looper. And as you can see with the additional gear photos, Tim Pierce owns (nearly) every tone-tweaking device ever made!
