The rest of the electronic world moved away from tubes in the 1970s, but musicians, audiophiles and engineers have made it clear that their tube amplifiers and microphones are here to stay. Part of maintaining this old-world gear is properly maintaining it, and that's why it's important to have a few spare tubes kicking around to make sure you're never without the massive, warm sound that our favorite tube gear provides. Shop Reverb's mammoth collection of newly manufactured tubes from the likes of JJ Electronic, Mesa Boogie, and Electro-Harmonix as well as NOS vintage tubes from RCA, Sylvania and General Electric.