The VTL MB-450 Series III Monoblock Amplifier is a masterclass in tube amplification, engineered to deliver both immense power and captivating musicality. Designed as a single-channel unit (requiring a pair for stereo), it provides dedicated power for each speaker, ensuring ultimate channel separation and dynamic impact.

At its core, the MB-450 Series III features a fully balanced differential circuit and VTL’s signature zero global negative feedback design, allowing the amplifier to reveal music with breathtaking clarity and speed. With 425 watts in Tetrode mode (and 225 watts in Triode), it effortlessly controls even the most demanding loudspeakers, delivering deep, authoritative bass and an expansive, holographic soundstage.

A unique feature is the user-adjustable Damping Factor control, which allows you to fine-tune the amplifier’s interaction with your specific speakers for optimal sonic balance and control. Combined with automatic bias and fault sensing for reliable operation, premium components like Mundorf capacitors, and a robust build, the MB-450 Series III renders music with powerful dynamics, rich tonal colors, and an undeniable emotional connection, truly bringing your recordings to life.

- 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
- 425 watts per channel in tetrode; 225 watts per channel in tri

Vacuum Tube Complement: 8 x 6550 or KT-88, 1 x 12AT7, 1 x 12BH7
Output power: 20Hz – 20kHz <2.5% thd
Tetrode: 425 Watts, Triode: 225 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: 450W Tetrode & 200W Triode: -110dB, 120Hz
Power consumption: Idle = 300W, Full power = 1000W
Primary mains fuse rating: 100/120V = 15A Ceramic Slo Blo, 220/240V = 8A 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 – 2.5A 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: 93lbs (42kg) per monoblock unpacked, 110lbs (50kg) packed

Orders ship Sunday through Friday from our offices in Dubai, UAE.

In-stock products typically ship within 48 hours and should be expected to arrive in 3-4 business days. Orders outside of the UAE should be expected to arrive in 5-7 business days.

Pre-order and backorder products will state the approximate delivery timeline beside the Add To Cart button.

If you would like to place a custom order, chat with our specialists for a guided shopping experience. Once your order has been placed, a timeline will be provided depending on your order details.

- Free delivery within the UAE
- Shipping charges will be calculated upon checkout for orders outside of the UAE (Bahrain, Oman, Kuwait, Saudi Arabia & Qatar).
- Taxes and duties are calculated according to the applicable laws of the state or country an item is shipped to and are the customer's responsibility.

For additional information on shipping and our exchange & return policy visit our help center.

Installation charges are applicable and can be paid upon delivery for our clients based in Dubai.

- Installation Charges: AED 450 Per Hour
- Speaker Cables: AED 32 Per Meter
- Trunking: AED 10 Per Meter

For clients based outside of the UAE, please contact our specialists and we will share an estimate based on your requirements.