VTL MB-185 Series III Signature par
Efter fodsporet på MB-450 Series III har MB-185 Series III Signature monoblokken gennemgået de samme teknologiske forbedringer som sin storebror. Opgraderingen til Series III-platformen er omfattende med en komplet omarbejdning af signalstien og nye funktioner tilføjet, samtidig med at al brugervenligheden fra den tidligere model bevares, såsom automatisk rørforspænding og omfattende fejlregistrering.
VTL MB-185 Series III Signature par
Upgrades include a fully balanced differential input stage driving a differential phase splitter and a lower impedance push-pull output stage. Also new is 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.
Another significant change to the MB-185 is the switch to EL-34 tubes. Long admired for their rich, natural and open sound, the EL-34s bring a distinctive new sonic signature to the amplifier that emphasizes the integration and inner details of music. The output transformer has been completely redesigned and carefully matched to complement the midrange purity and quick, taut bass of EL34s.
There is also a new user adjustable Damping Factor Feedback control that allows the user to adjust the amplifier’s output impedance by varying the amount of negative feedback. Impedance can now be precisely set to suit the listener’s taste, and to improve control of the loudspeaker loads to deliver best performance.
The 4 possible settings are:
LOW – Lowest damping factor, good loudspeaker control, most natural sound.
MED – Better loudspeaker control, with some impact on sound quality
HI – Best loudspeaker control, with a little more impact on sound quality, but on speakers that need the control the sonic improvement is clear
MAX – Maximum damping factor, but sonic impact is noticeable
Vacuum Tube Complement
8 x EL34 or 6CA7, 1 x 12AT7, 1 x 12BH7
Output power
20Hz – 20kHz <3% THD
Tetrode: 225 Watts, Triode: 140 Watts
Into 5Ω
Input sensitivity
Variable between 1-2V, depending upon DF setting
Input impedance
45kΩ
Load setting
5Ω
Output load range
4Ω – 8Ω
S/N ratio
225W Tetrode & 140W Triode: -90dB, 120Hz
Power consumption
Idle = 270W, Full power = 550W
Primary mains fuse rating
100/120V = 12A Ceramic Slo Blo, 220/240V = 6A Ceramic Slo Blo
Input fuse
100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo
Logic fuse
100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo
B+ fuse rating
Plate Fuse – 1.5A fast acting 600V, Screen Fuse – 0.75A fast acting 600V
Dimensions W x D x H
18.5 x 18 x 9 inches (47 x 45.7 x 23 cm)
Weight
85lbs (38.5kg) per monoblock unpacked, 100lbs (45.4kg) packed
