VTL MB-185 III
VTL’s MB-185 III pairs EL34 tonal richness with startlingly taut bass control, expansive imaging and genuine dynamic authority. Peter Katsoulis found its rhythmic precision, airy vocal presence and naturally wide soundstage unusually complete for a powerful tube design, while adjustable damping factor and triode/tetrode operation broaden its speaker-matching appeal.
WATT RECOMMENDS
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Deliciously Crispy
Sound Quality
94/100
Build Quality
94/100
Value for Money
85/100
Pros
Combines harmonically accurate, neutral-musical tone with airy, bodily voices, stable imaging and a wide, natural soundstage.
Delivers exceptional pace, rhythmic acuity and dynamic energy without sacrificing harmonic development or low-level detail.
Bass is unusually taut and well defined for a tube amplifier, with convincing grip, presence and pitch precision.
Adjustable damping factor, automatic biasing and comprehensive tube-fault protection make setup and speaker matching more accommodating.
Cons
Ultimate inner and spatial resolution at the furthest edges of a recording may be surpassed by other amplifiers.
It is a physically massive monoblock, which may complicate placement and handling.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 94/100
The MB-185 III is praised for combining tube richness and harmonic color with unusual clarity, speed, grip, and extension. Its presentation is described as neutral yet musical, with stable imaging and a broad, naturally proportioned soundstage rather than an overtly etched or artificially spotlighted one.
Transparency Resolution
94/100
Peter Katsoulis found tetrode operation clearer from top to bottom, with greater intelligibility, ease, and extension. He also describes airy vocal projection, strong inner detail, and linear, fast, detailed treble that is notably accomplished for a tube amplifier.
Tonal Balance Musicality
95/100
The review repeatedly praises righteous tone, harmonic accuracy, and a balance that remains neutral and musical across genres. The EL34 presentation brings sweet, naturally rich midrange color, yet the amplifier avoids becoming slow, overly warm, or softened at the frequency extremes.
Dynamics
95/100
The MB-185 III is commended for state-of-the-art timing acuity and dynamic energy, with excellent leading-edge definition and convincing micro- and macro-dynamic structure. Bass is described as taut and unusually well controlled for a tube design, with real grip, pitch definition, and presence.
Soundstage Imaging
93/100
Images are reported as stable but never etched, while voices retain body, height, and airy projection. Soundstaging is said to be as wide, deep, and natural as the recording allows, creating a particularly immersive and authentic sense of recorded space.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
94/100
The review highlights generously sized proprietary output transformers, premium Mundorf silver-foil capacitors, and a carefully revised balanced circuit architecture. Automatic tube biasing, multilayer output-tube protection, adjustable damping-factor feedback, and exemplary fit and finish point to a thoughtfully engineered high-power valve monoblock.
Value for Money
85/100
At approximately $4,000, the MB-185 III occupies a serious high-performance tube-amplifier price bracket, while providing substantial 225W tetrode power per monoblock and extensive protection provisions. The review is highly enthusiastic about performance, but it does not directly compare the amplifier's asking price with competing models or make an explicit value claim.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- 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
Manufacturer's Description — VTL
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
Verified Dealers
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Authorized dealers for VTL MB-185 III
- Audio Alternative — online and in-store — Fort Collins, Colorado, United States (website)
- Audio Element — in-store — Pasadena, California, United States (website)
- Audio Reference — in-store — Hamburg-Nord, Hamburg, Germany (website)
- Class D Audio USA — online — United States (website)
- CommonSense Audio — United States (website)
- George Meyer AV — in-store — Los Angeles, California, United States (website)
- Innovative Audio Video — in-store — New York, New York, United States (website)
- Kronos Audio Visual — online and in-store — Staplefield, England, United Kingdom (website)
- Magic Sound — online and in-store — Italy (website)
- Media Seller — Germany (website)
and 14 more verified dealers