Music connoisseurs have long admired the MB-450 for outstanding performance at a fair value. Now, VTL has significantly revised these venerable monoblocks, using many of the technological innovations derived from the flagship Siegfried Reference Amplifier. The extensive updates include a revised power supply, SmartTube technology with automatic bias adjustment and fault sensing, and upgraded electronic components. The result is a significant advance in sonic performance, with greatly improved bass punch and dynamics. A sleek new precision-milled faceplate incorporates a smoked glass window, giving users an impressive glimpse of the glowing tubes within. These monoblocks are ideally suited for those seeking a thoroughly modern high-power amplifier that competes in sonics, looks and usability with the very best.   Feature List: VTL proprietary Signature output transformer Software microprocessor controlled Tetrode/Triode Switchable Auto Bias, Fault Sensing Current in-rush limiting Standby Mute function 450 watts per channel in tetrode; 200 watts per channel in triode 8 x 6550C or KT-88 tubes per monoblock Regulated screen supply and separate fusing Discrete regulated input and driver supply Redesigned fully balanced input and driver stages High quality audiophile grade coupling caps 12V Trigger and mute input Extruded aluminum front panel with luxurious, modern look – black and silver options available Front panel window of thick smoked glass reveals the glow of multiple output tubes Rack mountable Rigid construction and improved heat ventilation