The PrimaLuna EVO 400 Integrated is the flagship vacuum tube integrated amplifier in PrimaLuna’s acclaimed EVO Series.

Engineered without compromise to deliver ultimate dynamic range, authority, and acoustic refinement, it represents the absolute pinnacle of the Dutch manufacturer's tube design.

Compared to the EVO 300, the EVO 400 doubles the output section by employing eight EL34 power tubes (four per channel) alongside six 12AU7 preamplifier/driver tubes. This massive architecture yields 70 Watts per channel in Ultra-Linear mode and 38 Watts per channel in Triode mode, instantly switchable via the included remote control. Hand-crafted with point-to-point wiring using silver-plated oxygen-free copper wire, the EVO 400 features custom-wound ultra-wide bandwidth transformers and an advanced Adaptive AutoBias system that enables effortless tube rolling without manual adjustment.

Key Features and Technical Specifications

• Type: Flagship vacuum tube stereo integrated amplifier with Triode / Ultra-Linear switching;

• Stock Tube Complement: 8x EL34 (power tubes), 6x 12AU7 (driver / preamp tubes);

• Tube Rolling Compatibility: Supports EL34, 6L6G, KT66, KT88, KT120, and KT150 power tubes via AutoBias (with rear switch for High/Low bias setting between EL34 and KT tube families);

• Bias Technology: Advanced proprietary Adaptive AutoBias circuit with individual tube status/failure LED indicators;

• Power Output per Channel (with EL34 tubes):

  • Ultra-Linear Mode: 70 Watts RMS into 8 Ω;

  • Triode Mode: 38 Watts RMS into 8 Ω;

• Headphone Stage: Front-panel 6.35 mm (1/4") headphone jack driven directly by the full tube circuit;

• Analog Inputs:

  • 5x RCA line-level pairs (CD, Tuner, Aux 1, Aux 2, Aux 3);

  • 1x Balanced XLR stereo pair;

  • 1x RCA HT Bypass pair (Home Theater Direct Pass-through);

• Analog Outputs:

  • Speaker binding posts with dedicated 4 Ω and 8 Ω taps;

  • 1x Stereo RCA Tape Out pair;

  • 1x Stereo RCA Pre-Out pair;

  • 1x Subwoofer RCA Out (with Mono/Stereo selector switch);

  • 1x Front 6.35 mm (1/4") headphone jack;

• Audio Performance:

  • Frequency Response: 9 Hz – 50 kHz (+/- 1 dB), 8 Hz – 85 kHz (+/- 3 dB);

  • Signal-to-Noise Ratio (SNR): 93 dB (103 dBA);

  • Input Sensitivity: 320 mV;

  • Input Impedance: 100 kΩ;

  • Total Harmonic Distortion (THD): < 0.2% @ 1 W; < 2% at rated power;

• Construction: Point-to-point hand wiring with Swiss silver-plated wiring, Takman resistors, DuRoch capacitors, ALPS Blue Velvet motorized volume potentiometer, custom potted toroidal transformers;

• Included Accessories: Removable protective tube cage, heavy-duty full-metal IR remote control with Triode/Ultra-Linear toggle button;

• Available Finishes: Black or Silver with brushed aluminum front panel;

• Dimensions (W x H x D): 385 mm x 205 mm x 405 mm (15.2" x 8.1" x 15.9");

• Net Weight: 31 kg (68.3 lbs).