BrownBox is the first power correction unit designed exclusively for tube amplifiers. Knowledgeable techs and players have utilized voltage optimization for decades. Understanding the origin and fundamental of the signal chain is paramount in achieving a harmonically rich professional tone. Era correct supply voltage provides earlier tube saturation and break-up at lower volume levels, improved sustain, sag and compression, and a smoother tonal shift toward even-order harmonics. BrownBox does all that and more. Made in the USA
$249 through October.