VTL - Signature Monoblock Amplifiers

Current models include:
•  MB-450 Series II Signature
•  MB-185 Series II Signature

Further information:
•  Review

The VTL Signature Monoblock Amplifiers have evolved steadily since their early inception in the 1990’s, and are the most popular core models in VTL’s lineup. Known for their high power, high performance and ability to drive a wide range of speakers, the Signature monoblocks have won wide acclaim as the best value in high performance tube amplifiers. In 2007, VTL significantly transformed and modernized the Signature Monoblocks by incorporating the “smart-tube” technology derived from VTL’s flagship Siegfried Reference Amplifier, as well as updating its looks to match the sleek VTL Reference components. Utilizing the auto bias and fault-sensing technology first developed for the Siegfrieds, the new Series II Signature amps are now even easier to use and maintain. Parts upgrades, including portions of the regulated power supply used in the Reference VTL Siegfried monoblocks, contribute to a significant improvement in sonic performance, with greatly improved bass punch and dynamics.

MB-450 Series II Signature Monoblock Amplifier

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
Data Specifications

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MB-185 Series II Signature Monoblock Amplifier

The MB-185 Series II Signature monoblock delivers superior performance at an affordable price. It offers the same technological improvements and cosmetic refurbishment as its bigger brother, the MB 450 Series II, although in this case using six 6550C tubes and a more compact output transformer to make 220 watts per channel. The extensive updates to the Series II amplifier include a revised power supply, SmartTube technology with automatic bias adjustment and fault sensing, and upgraded electronic components. The result is an amplifier with improved dynamics as well as superior speed and transparency at the top end. With its extraordinary agility, the MB-185 Series II is ideally suited for use with planar or electrostatic speakers as well as dynamic speakers with 10-inch or smaller drivers.

Feature List:
VTL proprietary Signature output transformer Software microprocessor controlled Tetrode/Triode Switchable Auto Bias, Fault Sensing Current in-rush limiting Standby Mute function 220 watts per channel in tetrode; 110 watts per channel in triode 6 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
Data Specifications

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Review

VTL MB-450 Series II Signature monoblock power amplifier, Michael Fremer, January 2008

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