Description

Trafomatic EOS+ Dual-Mono KT150 Tube Power Amplifier

EOS+ DUAL-MONO POWER AMPLIFIER CLASS AB

Trafomatic EOS+ KT150 TUBE 150 WATTS

The Trafomatic EOS+ is the most powerful dual-mono power amplifier in the Trafomatic Audio lineup. Designed in a push-pull Class AB configuration and built around the highly regarded KT150 output tubes, it delivers 150 watts per channel. This level of power ensures confident control over a wide range of loudspeakers, including models with lower-than-average sensitivity that require substantial current delivery. As a dedicated power amplifier, the EOS+ requires the use of a separate preamplifier. This approach allows greater flexibility when building a system, enabling users to select a preamp that best matches their sonic preferences and system requirements. Whether paired with a tube or solid-state preamplifier, the EOS+ provides a stable and powerful foundation.

The amplifier incorporates a carefully tuned –6dB negative feedback design, developed from Trafomatic’s previous engineering work. Cathode feedback is implemented for its musical and balanced characteristics. The result is a presentation that combines control and precision with tonal naturalness. Bass response is firm and well defined, maintaining authority without excessive weight. Dynamic response is fast and stable, allowing the amplifier to handle both delicate passages and demanding musical peaks with composure.

A defining feature of the EOS+ is its separate external power supply unit. Built as an independent chassis, it houses a substantial 800VA toroidal transformer along with a C-L-C filter network. Each channel benefits from separated filtering, reinforcing the dual-mono architecture and contributing to improved channel separation and reduced noise. This design supports stable voltage delivery under load and enhances overall performance consistency. The output transformers are constructed using a Double-C core configuration, selected for bandwidth stability and efficient energy transfer. Solen fast capacitors are used throughout the circuit to ensure reliability and signal integrity. Together, these elements reflect a design philosophy focused on durability, electrical performance, and long-term listening stability.

From a visual standpoint, the EOS+ follows Trafomatic Audio’s modern design language. The KT150 tubes are positioned prominently and protected by an acrylic front glass panel. The dual-chassis configuration — amplifier and separate power supply — reinforces both its technical purpose and its physical presence. The layout is clean, balanced, and suitable for integration into high-end listening environments. With its combination of high output power, dual-mono construction, refined feedback tuning, and external power supply architecture, the EOS+ is engineered for systems where authority, clarity, and reliability are priorities. It is designed not only to deliver strong measurable performance, but also to provide consistent and controlled operation across a wide range of loudspeaker loads.

Highlights

• 150W per channel output
• Dual-mono push-pull Class AB design
• KT150 Tung-Sol output tubes
• Separate external power supply unit
• 800VA toroidal transformer
• Double-C core output transformers
• RCA and XLR inputs
• 4 and 8 ohm speaker outputs

Key Features

Dual-Mono Architecture
Independent channel layout and separate power filtering enhance channel separation and overall stability.

KT150 Tube Output Stage
Four KT150 Tung-Sol tubes provide high power delivery while maintaining the tonal characteristics associated with premium tube amplification.

Optimized Feedback Design
–6dB tuned negative feedback with cathode feedback implementation for balanced, controlled performance.

External Power Supply
Dedicated chassis with 800VA toroidal transformer and C-L-C filtering for improved noise control and consistent current delivery.

Wide Bandwidth Performance
Frequency response from 10Hz to 100kHz (-1dB) ensures accurate reproduction across the audible spectrum and beyond.

Premium Components
Double-C core output transformers and Solen fast capacitors are used throughout the circuit.

Specifications

• Output power: 2x150W
• Class of operation: Push-Pull (Class AB)
• Tube complement: 4x KT150 Tungsol, 2x ECC99, 2x 5687
• Inputs: RCA/XLR
• Tube protect: Acrylic front glass
• Outputs: 4 and 8 ohms
• Input sensitivity: 1.2Vrms
• THD %: 0.03% – 1W/1KHz, 3% – 150W/1KHz
• Frequency bandwidth: 10Hz (-1dB) – 100KHz (-1dB)
• S/N Ratio: 82dB
• Input impedance: 100K
• Power consumption: 500VA
• Input voltage: 230V/50Hz – 115V/60Hz switchable
• Amplifier Size: 450x350x230mm
• Power supply size: 150x300x200mm
• Weight: 27kg amplifier + 11kg power supply box

Source: https://www.trafomaticaudio.com/products/eosplus-power-amp/?portfolioCats=12