Miller’s current live and studio amp rig of choice is a pair of Swart AST Pros that he runs in stereo, with Universal Audio Ox Amp Top Boxes. He loves the amps’ tremolo. “I have not turned my tremolo off since ’81, ’82,” says Miller. “I mean, why would I?” And indeed, the effect, either ping-ponging between two amps in mild disagreement or synched together, is part of his sonic signature. He also loves the Swarts’ tube-driven reverb. And the Ox Box was an integral part of Miller’s strategy for making his latest album with Julie Miller, using it to record with her at low-volume at home, taking advantage of the Ox’s power-attenuation and cabinet modeling.

Miller likes to chase the end of the tonal spectrum his fellow stringed-instrument players are not. So when somebody plays a chiming axe, he’ll reach for a bass or baritone. And when the low end’s already covered, he may reach for this mando-guitar. It’s a Hammertone 12-string, with a Vox-y look and a drumskin finish. Miller explains it’s “basically a 12-string guitar tuned up an octave.” He used it to play the signature riff on Lucinda Williams’ “Car Wheels on a Gravel Road.” He owns four or five of these instruments. “They don’t last too long, because they have so much string-tension that the necks bow on them, but they’re great for recording,” he offers.

Miller plays a salt-and-pepper couple of Wandre guitars, primarily using this black 6-string and its white sibling as his main instruments. He had to sell one of his Wandres—a red-finish one—years ago because he needed money for his wedding to Julie. The buyer: Larry Campbell, who toured with Dylan and has played with a host of others, including Paul Simon, Willie Nelson, and Rosanne Cash.

Drawn to its cream-sparkle finish, Miller got this Wandre in a Colorado pawnshop for $50. It ignited his passion for the ’60s Italian brand, for which he’s single-handedly inspired a small revival of interest. The neck is aluminum under the fretboard, and the metal plank continues back to the tremolo bridge, with the single-coil pickups mounted onto it. They never make contact with the body. But as anyone who’s heard Miller’s work—from his solo recordings to his touring as a member of the Alison Krauss and Robert Plant Raising Sand band and Plant’s Band of Joy—knows, it sounds rich, deep, and full. Note the push-buttons for pickup settings and the strips of electrical tape holding the plastic body together. The neck pickup is backwards and wired out of phase. At one point, when Miller lived in New York City, this guitar was stolen. Somebody then found it under a truck, in its case, and returned it to Miller. “The person who stole this thing threw it out,” Miller says, laughing. “They were hoping for something better.”

This old Gibson J-45 is another of Miller’s acoustic workhorses. It has an L.R. Baggs Anthem System. He says it has “that old rhythm guitar sound” like you’d hear on an early Dylan recording. And Jeff Bridges played this 1954 model in the movie Crazy Heart.

This 12-string Veillette Avante Gryphon came from the famed guitar dealer George Gruhn. This high-tuned instrument is D to D, and the strings are doubled, like a mandolin. It’s a favorite of Julie Miller, who wrote half the new songs on Breakdown on 20th Ave. South on it.

Here’s a rare bird: a Hofner 6-string bass. Check out the crazy push-buttons in the control set! It’s an elegant-looking beast that Miller prefers to Fender’s 6-string basses. He describes it as a “songwriting machine.” One winter, Robert Plant, Band of Joy drummer Marco Giovino, and Miller sat in his studio for a spell and churned out a dozen songs with Miller propelling things with this bass.