PrimaLuna EVO 400 (amplifier) black

Toroidal Power Transformer

Power transformers generate two types of noise, magnetic and acoustic. That’s why toroidal power transformers are used in the best audio products. Compared to standard transformers, toroids emit about 1/10 the magnetic field that pollutes the music and obscures details. Plus, the absence of an air gap generally means toroids have an 8:1 reduction in acoustic noise. Since transformers are the most expensive components in any audio product, manufacturers will even house cheaper C-core and EI-core transformers in an outboard power supply with an umbilical cord rather than switch to a costly toroid. The cost increase is significant, but PrimaLuna doesn’t cut corners. All PrimaLuna products use massive potted toroidal transformers.

Bad Tube Indicator

PrimaLuna’s engineers wanted to make owning a tube amp so simple you’d have no excuse not to fulfill your tube dreams.

If a tube fails, Adaptive AutoBias will instantly put the amp into protection mode so no parts can be damaged. A red LED will light in front of the tube that needs replacing. Simply plug in another tube and listen. No guesswork.

Super Wide Bandwidth Output Transformers

Output transformers are the most important part of any tube amp. They determine bass depth and top-end extension. 250W of power will have no top and bottom extension if the output transformers don’t have the bandwidth. We use lower power for longer tube life and bandwidth to give you slam. Transformers are an amplifier’s most expensive parts, so manufacturers save money by using “off-the-shelf” units available on the market. PrimaLuna’s output transformers are custom designed, wound in-house, and massive.

Point-to-Point Wiring

You spend a lot of money on interconnects. So why have the signal go right from the RCA jacks or speaker terminals onto circuit boards with copper traces so thin you can barely see them? How is that high-end?

PrimaLuna uses point-to-point wiring on all products. The entire signal path, including resistors and capacitors, is painstakingly hand-wired with heavy-gauge cable by an artisan.

Technical Specifications

Power

Ultra-linear

• 70 W × 2 (EL34) at 8 Ω, 1% THD
• 140 W × 1 (EL34) at 8 Ω, 1% THD

Triode

• 38 W × 2 (EL34) at 8 Ω, 1% THD
• 82 W × 1 (EL34) at 8 Ω, 1% THD

Tube Configuration

• 6 × 12AU7
• 8 × EL34

Audio Performance

• Frequency response:
  • 9 Hz - 60 kHz ± 1 dB
  • 8 Hz - 70 kHz ± 3 dB
• Harmonic distortion: < 0.1% at 1 W, < 2% at maximum power
• Signal-to-noise ratio: 95 dB
• Input sensitivity: 1,100 mV
• Input impedance: 100 kΩ

Connectivity

• 1 × RCA stereo input
• 1 × XLR stereo input
• 1 × 4, 8, and 16 Ω stereo outputs
• 1 × 2, 4, and 8 Ω mono output

Physical Characteristics

• Power consumption: 470 W
• Dimensions (W × H × D): 38.6 × 20.6 × 40.4 cm
• Weight: 38 kg

Warranty

• Device: 2 years parts and labor
• Tubes: 3 months