Rex integrates – BAT's new VK80i 4-input integrated amplifier (3:1 RCA:XLR) uses trickle-down tech from their flagship Rex 3 architecture. It consists of 4 x 6C33C-B single-ended amps of which two per channel sum at a custom output transformer which no direct current flows through for very wide bandwidth. Auto bias insures automatic adjustments during the output tubes' aging process and an LED system indicates when a tube needs replacing. Should a tube fail, it no longer mandates a fuse change. Just pull out the worn tube and insert a new one for zero-hassle tube amp ownership. The VK80i is available in black or silver and sports the company's new industrial design and logo.