PrimaLuna EVO 400 Tube Integrated Amplifier

Overview

The PrimaLuna EVO 400 sits near the top of PrimaLuna's all-tube integrated lineup, and it shows the moment you lift the lid. Eight EL34 output tubes running in push pull deliver 70 watts per channel, with a front panel switch that lets you move between the warmth of triode and the wider bandwidth punch of ultralinear operation. It is a genuinely flexible one-box tube system that rewards both casual listening and serious critical sessions.

Build quality is the heart of the PrimaLuna story. The EVO 400 uses hand done point to point wiring with premium Swiss wire, Takman resistors, an ALPS Blue Velvet potentiometer, and heavy potted transformers. Adaptive AutoBias keeps the tubes perfectly biased at all times, and the Bad Tube Indicator makes ownership approachable even if you have never owned a tube amp before. This is the kind of engineering we love showing off on the AEA demo floor.

With five line inputs, a home theater bypass, transformer coupled subwoofer output, and a genuinely excellent all-tube headphone stage, the EVO 400 covers nearly every use case a music lover could ask for. Pair it with efficient speakers and it becomes the emotional center of a room.

Key Features

• EL34 Push Pull Power. Eight EL34 output tubes deliver 70 watts per channel, enough authority to drive a wide range of speakers with the tone tube lovers crave.
• Triode or Ultralinear Switching. A front panel switch lets you choose the intimate warmth of triode or the wider bandwidth and dynamics of ultralinear operation, all on the fly.
• Adaptive AutoBias. The amplifier continuously biases each output tube for you, which extends tube life, reduces distortion, and removes the guesswork of manual biasing.
• Bad Tube Indicator. If a tube fails, the amp enters protection mode and a red LED lights in front of the tube that needs replacing. Swap it and keep listening, no soldering iron required.
• All-Tube Headphone Stage. An output transformer coupled headphone amp lets you enjoy triode or ultralinear listening through demanding planar and dynamic headphones alike.
• Point to Point Construction. Hand wired with premium Swiss wire, Takman resistors, an ALPS Blue Velvet potentiometer, and heavy potted transformers for long term reliability and low noise.
• System Friendly Connectivity. Five RCA inputs, a home theater bypass, tape out, and a transformer coupled subwoofer out make integration into any system straightforward.

How the PrimaLuna EVO 400 Tube Integrated Amplifier Compares

PrimaLuna EVO 400 Tube vs Accuphase E-3000

The Accuphase is a refined solid state alternative with meticulous build and a silky presentation. The EVO 400 answers with genuine tube tone and triode or ultralinear flexibility that only vacuum tubes provide.

PrimaLuna EVO 400 Tube vs Luxman L-505Z

The Luxman offers polished solid state control and its signature warmth. If you want an actual all-tube experience with hands-on triode switching, the EVO 400 is the natural choice.

PrimaLuna EVO 400 Tube vs Yamaha A-S2200

The Yamaha brings classic styling and clean transistor power with those iconic meters. The PrimaLuna trades meters for glowing tubes and a distinctly organic midrange character.

PrimaLuna EVO 400 Tube vs Advance Paris A12 APEX

The Advance Paris delivers big solid state wattage and hybrid tube touches. The EVO 400 is fully tube throughout, offering a more consistently valve-flavored sound top to bottom.

PrimaLuna EVO 400 vs PrimaLuna EVO 300 (next step down)

The EVO 300 is a more compact option that keeps triode and ultralinear operation but uses four EL34 for 42 watts per channel instead of eight EL34 for 70.

Recommended Speakers

Tube amplifiers love efficiency, and the EVO 400's 70 watts per channel go a very long way with high sensitivity speakers. We lead with Klipsch Heritage for their natural synergy with EL34 tube tone, then round out with a few other efficient favorites from our floor.

• Klipsch Cornwall IV: A benchmark pairing. The Cornwall IV's high efficiency and effortless dynamics let the EVO 400's tube character shine with room-filling scale and lifelike presence.
• Klipsch Forte IV: A slightly more compact Heritage option that is still very easy to drive. The Forte IV delivers big, punchy sound with tube warmth to spare from the EVO 400.
• Klipsch Heresy IV: A compact Heritage design that thrives on tube power. The Heresy IV offers vivid, immediate sound and pairs beautifully in smaller and medium rooms.
• Klipsch La Scala AL6: For those wanting reference level dynamics, the fully horn loaded La Scala AL6 makes the most of every tube watt with startling clarity and impact.
• Klipsch RF-7 III: A high efficiency Reference tower that mates cleanly with the EVO 400, delivering energetic, detailed sound with plenty of headroom.

Frequently Asked Questions

What kind of amplifier is the PrimaLuna EVO 400?

It is an all-tube integrated amplifier using an EL34 push pull output stage, with switchable triode or ultralinear operation.

How much power does the EVO 400 produce?

It delivers 70 watts per channel, ample for most efficient and moderately efficient speakers.

What tubes does the EVO 400 use?

It uses eight EL34 output tubes and six 12AU7 tubes in the driver and preamp stages.

What is the difference between triode and ultralinear mode?

Triode mode offers a warmer, more intimate presentation, while ultralinear mode delivers wider bandwidth and more dynamic drive. You can switch between them with the remote or front panel.

Do I have to manually bias the tubes?

No. Adaptive AutoBias continuously sets the correct bias for each tube automatically, which simplifies ownership and extends tube life.

What happens if a tube fails?

The amplifier enters protection mode and a red LED lights in front of the failed tube. You simply replace that tube and resume listening.

Can I roll different tubes in the EVO 400?

Yes. The Adaptive AutoBias system accommodates a range of compatible output tubes, making tube rolling straightforward. Ask our team about compatible types.

Does the EVO 400 have a headphone output?

Yes, it includes an output transformer coupled all-tube headphone stage with a quarter inch jack that works with demanding planar and dynamic headphones.

Can I connect a subwoofer?

Yes, it offers a transformer coupled subwoofer output designed for easier integration with your main speakers, plus a stereo or mono option.

Does it have a home theater bypass?

Yes, there is a dedicated home theater bypass input so you can integrate the EVO 400 into a surround system while preserving its stereo performance.

Is a phono stage included?

A moving magnet phono stage is available as a factory option. Let us know if you plan to run a turntable and we can advise on configuration.

What speaker taps does it have?

It provides 4 ohm and 8 ohm speaker taps so you can match a variety of loudspeaker impedances.

What finishes are available?

The EVO 400 is offered in silver and black.

How heavy is the EVO 400?

It weighs 68.2 pounds, thanks largely to its substantial potted transformers and robust chassis.

What are the dimensions?

It measures 15.2 inches wide, 8.1 inches high, and 15.9 inches deep. Allow extra clearance above for ventilation and tube cage removal.

How many inputs does it have?

It offers five stereo RCA line inputs plus the RCA home theater bypass input, along with a tape output.

Does it come with a remote control?

Yes, it includes a full function remote that controls volume, input selection, and triode or ultralinear switching.

What speakers pair best with the EVO 400?

High efficiency designs are ideal for tube amps. Klipsch Heritage models are a superb match, and we cover our favorites in the recommended speakers section.

Is the EVO 400 a good choice for a first tube amp?

Absolutely. Adaptive AutoBias and the Bad Tube Indicator make it one of the most approachable tube integrateds available while still satisfying seasoned enthusiasts.

Why buy from All Elite Audio?

We are an authorized PrimaLuna dealer in Maryland with the EVO 400 in stock and set up for audition. Our team helps with speaker matching, tube guidance, and long term support so you buy with confidence.