For vintage, tube-driven boost tones, check out the Vox Tone Garage Flat 4 booster. Featuring one built-in 12AX7 tube that's capable of up to 200v, a Baxandall tone circuit that allows you to adjust to your preferred boost or cut range. Dialing up your gain will slowly cut your low-end for a more retro-sounding drive, while using the independent mid-booster will let you turn it up for some searing lead tones.