PrimaLuna EVO 400 Tube Power Amplifier

Remote-Controlled Triode and Ultra-Linear Switching

Choose the warm, full presentation of Triode operation or the wider bandwidth, greater extension and increased power of Ultra-Linear mode. Switch between them from the supplied remote for instant comparisons without interrupting the music.

 

AC Offset Killer

PrimaLuna’s AC Offset Killer reduces transformer noise caused by irregularities in the mains supply. Combined with custom-wound toroidal transformers, it creates a quieter background that reveals greater space, texture and natural musical decay.

 

Bad Tube Indicator

If a tube fails, Adaptive AutoBias immediately places the amplifier into protection mode to help prevent damage. A red LED identifies the tube requiring replacement, making maintenance quick and straightforward.

 

Premium Takman Resistors

Japanese-made Takman resistors are selected for their low noise, linearity and musical performance. These premium components form part of PrimaLuna’s uncompromising approach to construction and sound quality.

 

Stereo or Monoblock Operation

A simple switch converts the EVO power amplifier from stereo to monoblock operation, allowing your system to expand over time. Monoblock mode uses both output transformers and adds a 2-ohm speaker connection alongside the 4- and 8-ohm taps for greater loudspeaker flexibility.

 

Custom Toroidal Power Transformers

PrimaLuna uses massive, custom-made toroidal power transformers to minimise magnetic interference, vibration and acoustic noise. Each transformer is enclosed in metal and potted in non-microphonic resin to protect its windings from moisture and long-term deterioration.

 

Custom Wide-Bandwidth Output Transformers

PrimaLuna’s output transformers are custom-designed and wound in-house to provide extended bass, open high frequencies and powerful, controlled sound. Their wide bandwidth allows the amplifier to prioritise musical performance while operating its tubes conservatively.

 

Adaptive AutoBias

Adaptive AutoBias continuously monitors the output tubes and makes seamless adjustments in real time. The passive circuit sits outside the signal path, reduces distortion at higher listening levels and helps extend tube life with minimal maintenance.

 

Extensive Tube Compatibility

A fine-tuning switch optimises operation for EL34- and KT88-family tubes. Compatible options include 6L6G, 6L6GC, 7581A, EL34, EL37, 6550, KT66, KT77, KT88, KT90, KT120 and KT150, allowing you to tailor the amplifier’s character to your system.

 

Point-to-Point Wiring

The complete signal path is meticulously hand-wired by skilled craftspeople using heavy-gauge cable. EVO 300 and EVO 400 models also use Swiss-made, silver-plated OCC copper wire with a Teflon dielectric in critical signal-path locations.

 

SmartWatts for Extended Tube Life

PrimaLuna operates its output tubes at approximately 417 volts across the plates and screens, using the minimum practical dissipation without introducing crossover distortion. This reduces tube stress, supports longer operating life and maintains excellent sound quality.

 

Performance Beyond the Power Rating

Power output alone does not determine sound quality, bass impact or musical engagement. PrimaLuna prioritises transformer bandwidth, circuit quality and controlled tube operation to deliver dynamic, authoritative performance at everyday listening levels.

 

Tailor the Sound to Your System

Different output tubes allow you to fine-tune the amplifier’s tonal character to complement your loudspeakers, room and preferences. This broad compatibility provides flexibility for future system changes and encourages experimentation with different tube types.