There are a small handful of old tubes that need an impressively low voltage to work, though, and [J.G.] has put a few of them to work in this battery-powered audio tube amplifier. The key to the ...

Boss’s Katana series amps have become favorites with guitarists looking for lightweight, durable and affordable amplifiers that offer the sound, feel and response of classic tube amps while ...

Battery-powered pocket amplifiers exist and street performers have pretty solid busking setups, but a truly worthy and ready traveling amp was still something that eluded much of the guitar world.