VTL MB-450 Signature Series II

VTL MB-450 Signature Series III

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Music lovers have long admired the VTL MB-450 Signature monoblock amplifier for outstanding performance at a fair value. The new Series III version of the long-standing MB-450 platform features a complete re-working of the entire signal path. Upgrades include a fully balanced differential input stage driving a differential phase splitter and a lower impedance push-pull output stage with a dramatically improved, fully balanced and enhanced interleaved and coupled output transformer. VTL's innovative engineering brings the legendary sonic performance of the venerable 450 Signature platform to even greater heights.
The new MB-450 Signature monoblocks gain further sonic benefits with a shorter, faster and fully balanced negative feedback loop, with zero global negative feedback. The negative feedback loop completely eliminates ringing and requires no capacitor compensation to maintain critical phase integrity and information. The result is an amplifier that remains stable even under the most demanding loads.

Product Description

  • Vacuum Tube Complement – 8 x 6550C or KT-88, 1 x 12AT7, 1x 12BH7
  • Output Power 20 Hz – 20 kHz into 5 ohm load
  • Tetrode = 425W
  • Triode = 225W
  • THD 20Hz – 20kHz @ 450W Tetrode
  • THD 20Hz – 20kHz @ 200W Triode
  • <2.5%
  • Input Sensitivity – Variable between 1-2V, depending upon DF setting
  • Input Impedance – 45K Ohms
  • Optimum Load Range – 5 Ohms
  • S/N Ratio @ 450W Tetrode
  • S/N Ratio @ 200W Triode
  • -110dB, 120Hz
  • Power Consumption
  • Idle = 300W
  • Full Power =1000W
  • Primary Main Fuse Rating
  • 110/120V = 15A Ceramic Slo Blo
  • 220/240V = 8A Ceramic Slo Blo
  • Input Fuse
  • 110/120V = 1A Ceramic Slo Blo
  • 220/240V = 1A Ceramic Slo Blo
  • Logic Fuse
  • 110/120V = 1A Ceramic Slo Blo
  • 220/240V = 1A Ceramic Slo Blo
  • B+ Fuse Rating
  • Plate Fuse – 2.5A Fast Acting 600V
  • Screen Fuse – 0.75A Fast Acting 600V
  • Dimensions
  • W = 18.5 Inches (47 cm)
  • D = 18 Inches (46 cm)
  • H = 9 Inches (23 cm)
  • Weight
  • 93 lbs (42 Kg) unpacked
  • 110 lbs (50 Kg) packed

Feature List

Feature List:
Fully balanced differential circuit – even single-ended signal produces balanced signal at output.
Re-designed fully balanced differential input and driver stages for increased signal swing, bandwidth and stability.
Zero global Negative Feedback.
Shorter, faster feedback loop for greater tonal control without phase shift.
Improved handling of loudspeaker loads for greater signal stability.
The amplifier is unconditionally stable, without the need for capacitor compensation.
Tube like JFET-type current source for lower sonic impact in single-ended mode.
Lower impedance output stage for improved loudspeaker control.
Dramatically increased interleaving and coupling in the balanced VTL proprietary Signature output transformer, for wider bandwidth and zero ringing.
Variable user-adjustable DF feedback control to vary output impedance and damping factor for optimal matching to speaker load.
Software microprocessor controlled
· Tetrode/Triode Switchable
· Auto Bias, Fault Sensing
· Current in-rush limiting
· Standby Mute function; with reduced tube current for increased tube life.
450 watts per channel in tetrode; 200 watts per channel in triode.
Uses eight 6550C or KT-88 tubes per monoblock.
Adjustable regulated screen supply for stable operating point; discrete regulated input and driver supply for greater signal resolution and tonality.
Adjustable precision-regulated bias supply for greater signal resolution and noise rejection and improved isolation from mains supply variations; output operating point does not change with AC power fluctuations.
Improved Autobias and fault sensing system to operate in fully balanced differential mode; amplifier is fully protected against output tube failure; no need for precision matching of output tubes.
All premium Mundorf silver oil caps in signal path
Film bypass of power supply caps for greater HF resolution.
Extruded aluminum front panel with luxurious, modern look – black and silver options available
Rack mountable.
Rigid construction and improved ventilation for lower operating temperature.
Factory upgradeable from Series II.


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