VTL Logo

Siegfried Series II Reference Monoblock

VTL Siegfried Series II Monoblock Power Amplifier
VTL Siegfried Series II Monoblock Power Amplifier
VTL Siegfried Series II Monoblock Power Amplifier

Since its introduction in 2003, VTL’s Siegfried Reference monoblock amplifier has been recognized as the leader in the world of high power, high performance amplifiers, both for ease of use and musicality. Known as the first tube amplifier to deploy true Auto Bias and Fault Sensing, as well as precision-regulated power supply technology, the Siegfried amplifiers have won the loyalty and appreciation of serious music lovers around the world.

 

VTL Siegfried Series II Monoblock Power Amplifier
VTL Logo

Siegfried Series II Reference Monoblock

Since its introduction in 2003, VTL’s Siegfried Reference monoblock amplifier has been recognized as the leader in the world of high power, high performance amplifiers, both for ease of use and musicality. Known as the first tube amplifier to deploy true Auto Bias and Fault Sensing, as well as precision-regulated power supply technology, the Siegfried amplifiers have won the loyalty and appreciation of serious music lovers around the world.

 


VTL Siegfried Series II Monoblock Power Amplifier VTL Siegfried Series II Monoblock Power Amplifier

FEATURES

  • Fully balanced differential circuit – 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 any capacitor compensation.
  • New 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 Reference 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
    • Fully bi-directional RS-232 control
  • 650 watts per channel in tetrode; 330 watts per channel in triode
  • Uses twelve 6550 or KT-88 tubes per monoblock
  • Adjustable precision-regulated plate and screen supplies 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
  • Precision regulated B+ and screen supplies
  • Rigid construction and improved ventilation for lower operating temperature
  • Factory upgradeable from Series I

SPECIFICATION

Vacuum Tube Complement 12 x 6550 or KT-88, 1 x 12AT7, 2 x 12BH7
Output power
20Hz – 20kHz <2.5% THD
Tetrode: 650W, Triode: 330W
Into 5Ω
Input sensitivity Variable between 1-2V, depending upon DF setting
Input impedance 45kΩ
Load setting 5Ω
Optimum load range 4Ω – 8Ω
S/N Ratio -110dB, 120 Hz
Power consumption Idle = 600W, Full power = 1500W
Primary mains fuse ratings 100/120V = 20A Ceramic Slo Blo, 220/240V = 10A Ceramic Slo Blo
Logic fuse 100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo
Input fuse 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo
Filament fuse 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo
Secondary fuse rating Plate Fuse = 5A fast acting 600V, Screen Fuse = 0.75A fast acting 600V
Dimensions W x D x H 11.5 x 24 x 24 inches (29.2 x 61 x 61 cm)
Weight 200lbs (90Kg) per monoblock unpacked, 325lbs (147Kg) packed

Downloads

Siegfried II Data Sheet

Find a partner

Find VTL Partners