SKU: 49104781798

PrimaLuna EVO 400 Tube Integrated Amplifier

Sale price$4499.55 Regular price$4999.50
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Description

PrimaLuna EVO 400 Tube Integrated AmplifierALL TUBE OUTPUT TRANSFORMER COUPLED HEADPHONE AMPLIFIER One of the best headphone amps in the world. And the only amp that lets you listen with either the warmth of Triode or the wide bandwidth of Ultra linear operation at the push of a button! Most tube integrated amps and preamps use a solid state op amp chip for running headphones. Stand alone tube headphone amps will vary in quality like any other tube amp. Headphones are simply small speakers

ALL TUBE OUTPUT TRANSFORMER-COUPLED HEADPHONE AMPLIFIER

One of the best headphone amps in the world. And the only amp that lets you listen with either the warmth of Triode or the wide-bandwidth of Ultra-linear operation at the push of a button! Most tube integrated amps and preamps use a solid state op-amp chip for running headphones. Stand alone tube headphone amps will vary in quality like any other tube amp. Headphones are simply small speakers that require less power. Some amps will use smaller output tubes that groan to have enough dissipation to run power-hungry planar headphones. Other brands, including those costing $5,000 or more like Mal Valve, will use larger output tubes, then use a voltage divider network to drop the power down to an acceptable level for headphones. This is how we do it. We simply took advantage of the fact that we make the best tube integrated amplifiers. Now you don't have to pay for a separate state of the art headphone amp. PrimaLuna integrateds are the favorite of owners who use everything from Audeze to Hifiman to Sennheiser!

BAD TUBE INDICATOR

PrimaLuna engineers wanted to make owning a tube amp so simple you would have no excuse not to have your tube dreams come true.

If a tube fails, Adaptive AutoBias will instantly put the amplifier into protection mode so no parts can get damaged. A red LED will light up in front of the tube that needs replacing. Simply plug in another tube, and listen. No guesswork. No smoking amp. No getting out the soldering iron or dropping your amp off at UPS.

TRANSFORMER-COUPLED SUBWOOFER OUT

The number one problem people face when adding a subwoofer is integration to the main speakers. When you run the subwoofer at “line level” while your main speakers are hooked up to the amplifier, the signals have a different character or “transfer”. That’s why REL, the premier manufacturer of subwoofers, prefers using a “Speakon” connector hooking up their subwoofers to the same terminals the speakers are hooked up to. Now both speakers and sub get the same “flavor” and are easier to integrate together. In addition, most integrated amps have a subwoofer out that is not as robust as using the line out from a preamp. The result? Reduced dynamics.

But there are some very good subwoofers that only have an RCA line-level input. That’s why the subwoofer out on the EVO300 and 400 integrated amplifiers are transformer coupled.

Switchable from stereo to mono, we run right off the speaker taps of our amazing wide-bandwidth output transformers to a voltage-divider network and lower output to line level. Now your subwoofer and speakers are seeing the exact same signal, singing the exact same tune, for perfect coherence. PLUS you get the benefit of increased dynamics. No other brand offers this feature. Only PrimaLuna.

REMOTE CONTROLLED TRIODE/ULTRA-LINEAR SWITCHING

Do you have some classic rock albums you used to love so much that have now ended up left on the shelf, un-played for years? How about jazz or classical recordings from the 60’s? Every audiophile has albums that they used to play, but stopped because they are harsh, brittle, or bright. There is a solution.

Triode and Single Ended Triode (SET) amps are popular for their warmer, fuller, and easy to settle into sound. But triode amps have limitations! Ultra-linear has more extension on the top and bottom, not to mention greater power. They have greater “pop” with a bigger difference between light and dark, and loud and soft. Having triode only is VERY limiting.

The best option is to have both triode and ultra-linear. PrimaLuna engineers in Holland designed an ingenious circuit that lets you change from triode to ultra-linear with a push of a button on the supplied remote control. No need to get up and stop the music. Make an instant comparison while you listen and choose what you like best for that song or album.

AC OFFSET KILLER - A PRIMALUNA EXCLUSIVE

AC Offset Killer is about goose bumps. The ones you get when music comes out of a background so quiet, you may say to yourself “Just how is this possible?” PrimaLuna custom-winds our own massive toroidal power transformers that are low in hum and EMI. But we wanted more. Our engineers designed the AC Offset Killer to lower transformer noise to a place no other manufacturer dreams of going, regardless of how bad your electricity is. The result? Sense of space. Texture. The resonance of an acoustic guitar or violin string that seems to trail on forever. The AC Offset Killer will amaze you.

TAKMAN RESISTORS

If you bought a lesser amplifier, you would pay hundreds to make this upgrade. Easy to identify through their pink color, these premium resistors from Japan are popular with those who rebuild and upgrade their gear. "Modders" love TAKMAN for their low noise, linearity, and musicality.

CUSTOM TOROIDAL POWER TRANSFORMER

Power transformers generate two types of noise, magnetic and acoustic. That's why toroidal power transformers are used in the very best audio products. Compared to standard transformers, toroids radiate about 1/10 the magnetic field that pollutes music and obscures detail. Additionally, the absence of an air gap typically means toroids have an 8:1 reduction of acoustic noise. As 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 box with an umbilical cable rather than upgrade to an expensive toroid. The increased cost is significant, but PrimaLuna doesn’t cut corners. All PrimaLuna products use massive, potted toroidal transformers. PrimaLuna transformers are enclosed in a metal housing and then potted in a non-microphonic resin to further reduce noise and to protect the windings from moisture and deterioration forever.

CUSTOM SUPER-WIDE-BANDWIDTH OUTPUT TRANSFORMERS

Output transformers are the most important part of any tube amp. They determine how low the bass will reach and how high the top end goes. 250 watts of power will have no top and bottom extension if the output transformers don't have the bandwidth. We use lower power to extend tube life, and bandwidth to give you slam. Transformers are the most expensive components in an amplifier, so manufacturers save money by using ‘off the shelf’ units available on the market. PrimaLuna output transformers are custom-designed, wound in-house, and massive. One reason why no other brand sounds like a PrimaLuna. "The flat tops and bottoms of these squarewaves correlate with the amplifier's extended low-frequency response; PrimaLuna's output transformers are of excellent quality." -John Atkinson, Stereophile Magazine

SUPERQUIET LINE INPUTS

Input selector switches leak noise and signals from other sources, as they never turn off the other inputs completely. And, they deteriorate with age, requiring the use of cleaners. Many are mounted on the front panel requiring long runs of wires to the back panel inputs. These wires pick up stray noise from RF and EMI.

PrimaLuna has a better way. Instead of a switch, input selection is done using premium quality sealed relays mounted in the rear where you plug in your components. When an input is selected, that relay closes giving you the best connection possible. All the other relays are left open, so noise and signals from other sources can’t leak in. The signal path is now almost non-existent, so there are no wires to pick up noise.

ADAPTIVE AUTOBIAS

What most companies call Auto Bias is actually "Cathode Bias"- A commonly used method that is cheap to make, and often found in guitar amps, but also $20,000 high end audio amps. It reduces the available power of the amp and runs the tubes hard, meaning shorter tube life and failures via "shorts".

PrimaLuna's Adaptive AutoBias is a true, smart technology employing an array of sensors to monitor tubes and make adjustments seamlessly in real time. More important, it is the ONLY circuit of its kind that is truly "adaptive" by addressing "tube pinch off" at higher volumes, therefore reducing distortion by over 50% and greatly extending tube life. Adaptive AutoBias is completely passive and NOT in the signal path. The result is low to no maintenance, long tube life, and the lowest possible distortion for amazing sound.

Adaptive AutoBias also provides unparalleled flexibility by allowing use of almost any tube on the market today. It even has a fine-tuning switch for EL-34 and KT88/KT120/KT150 tube types.

POINT TO POINT WIRING W/ SWISS MADE WIRE

You spend a lot of money on interconnects. So why have the signal go right from the RCA jacks or speaker terminals into circuit boards with copper traces so thin you can hardly see them? What’s high-end about that?

PrimaLuna employs Point to Point Wiring on all products. The entire signal path, including resistors and capacitors, is painstakingly hand wired with heavy-gauge cable by craftsman.

EVO 300 and EVO 400 models use Swiss-made, silver-plated, oxygen-free continuous crystal (OCC) copper with a Teflon dielectric in the critical signal path for superior signal speed and increased clarity.

SMARTWATTS - EXTENDED TUBE LIFE

Tube life is simply a matter of how hard you run the tubes. That’s it. The only way to extend tube life is to run them as close to zero as you possible can, making sure it is not so low you go into crossover distortion. The life of a tube will depend on two things: Plate and screen voltage.

If the plate and screen voltage is high, you are more likely to get tube shorts when you turn the amp on and you get cathode stripping which greatly effects the cathodes ability to spit out electrons. Manufacturers that run the hell out of tubes to pump up their power ratings will never tell you what voltages they use. They’ll say it’s “proprietary” as if it’s some secret sauce. There is no such thing. But if they told you that they used 575, 600, or even 625 volts you probably wouldn’t buy. We proudly tell you our tubes run at just about 417 volts for the plates and screens.

PrimaLuna runs their output tubes at a minimum dissipation without going into crossover distortion. When you look at our amps, they provide less power from each tube. With KT-120’s as an example, a PrimaLuna will give you only 21 watts per tube. So running a pair of them you get 42 watts. That’s a lot of power, but the demands per tube are a fraction of some manufacturers that give you 100 watts from a pair of KT-120’s. It’s a cheap way to get big power, and it’s cheap. In fact, free. To get more power the right way is expensive. It requires bigger transformers, sockets, wiring, resistors, capacitors, and the tubes to do it. Which is exactly what PrimaLuna did. But we didn’t stop there.

Read this carefully: Power has nothing to do with sound quality. Or bass slam. You can buy a 200 watt receiver for $299, and it will even have surround sound. Do you think for a minute it will sound better than a 50 or 100 watts high end amp costing $10,000? Of course not. Only first-time buyers think that way. Experienced audiophiles know that for the majority of listening sessions, you use maybe 10 watts of power.

OUR AMPS ARE PERFECT. BUT YOUR SYSTEM MAY NOT BE

Ask any seasoned tube-head what the most musical output tube is and they will most certainly declare it the EL34. Other amp manufacturers would love to use it. Only PrimaLuna, through our proprietary output transformer designs, can give you EL34 midrange beauty with top-end air that goes on forever. And, bass extension with so much slam, our amps are used to power subwoofers.

However, every system is different. What if you bought a speaker with bass that overloads the room? Or, that is too dark? Or, too bright? What if you just want to have fun trying the different colors of sound from a vast pallet of tubes? With other manufacturers' products, you're stuck. They're a one-trick pony. How are you going to fine-tune your sound? Buy some different cables?!

With PrimaLuna, you get to choose. Go for it. 6L6G, 6L6GC, 7581A, EL34, EL37, 6550, KT66, KT77, KT88, KT90, KT120, even the monstrous KT150. A future-proof design, PrimaLuna is compatible with NEW tube types not even thought of today!

Specifications

  • Power Ultra-Linear: 70 / 72 / 85 / 88 Watts per channel
  • Power Triode: 38 / 40 / 45 / 50 Watts per channel
  • Frequency Response: 9 Hz – 50 kHz +/- 1 dB, 8 Hz – 68 kHz +/- 3 dB
  • THD with AABB: < 0.1% @ 1W; < 2% @ Rated Power
  • S/N Ratio: 90 dB – 98 dB A Weighted
  • Input Impedance: 100 kOhm
  • Input Sensitivity: 320 / 320 / 360 / 370 mV for rated power at max volume
  • Maximum Gain Ultra-Linear: 37 dB / 37.5 dB / 37.5 dB / 36.9 dB
  • Maximum Gain Triode: 36.5 dB / 36 dB / 36 dB / 36 dB
  • Power Consumption: 470 Watts / 480 Watts / 540 Watts / 550 Watts
  • Weight: Net weight: 68.2 lbs / 31 kg, Shipping Weight: 79.2 lbs / 36 kg
  • Dimensions: 15.9" x 15.2" x 8.1" / 405 x 385 x 205 mm (L x W x H)
  • Shipping dimensions: 22.7" x 18.4" x 12.4" / 577 x 468 x 315 mm (L x W x H)
  • Inputs: 5 pairs Stereo RCA, 1 pair Home Theater Input
  • Outputs: 4 & 8 Ohm Speaker Taps, Tape, Stereo/Mono Sub, Headphone
  • Tube Complement: 8 x EL34, 6 x 12AU7
  • Damping Coefficient: 7 KD (1 kHz)
  • Remote Control: Full
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 49104781798

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4.8 ★★★★★
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Vieux
Boise, US
★★★★★ 5
Excellent monitor, return of first defective one was a breeze.
The first monitor that I received displayed tearing, flickering, and artifacts at 144hz refresh, using an RTX5080 Nvidia graphics card when playing Il2-Sturmovik at highest graphic settings. I thought I would give Crua another chance and requested a replacement. Amazon sent me a new monitor immediately which arrived 2 days later. I simply swapped out the screen and returned the defective monitor in the box the replacement was sent in. It was painless. I have had the new monitor for a couple of weeks and it has been flawless. Great color, sharp image, no dead pixels, stable at 160hz refresh. I cant vouch for its longevity yet, but I will give an update after 6 months or so. Otherwise, this is the best monitor for the money that I have found in its class, and has made an impressive improvement to my setup.
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Reviewed in the United States on April 1, 2026
K
Verified Purchase
Kim
Los Angeles, US
★★★★★ 5
Surprising quality, great for work
Size: 34 Inch, Size: 34 Inch
I know this is advertised as a gaming monitor, but I decided to get a large, wide monitor for long work hours to replace my two 27 inch monitors. It has just enough width that you can easily split the screen and work side-by-side. It is genuinely helped my neck pain since my posture is staying straight. There is no lag in the monitor and it has a pretty good design. Nice and thin, sleek. The amount on the back of it was a little strange, but I figured it out. The only thing I don’t like about this monitor is you cannot adjust the height up and down and it does not tilt but for the price I can live with that. It does give you the option to mount on a wall, which is nice. This might be a me problem, but it didn’t want to register with my thunderbolt docking station. I ended up needing to plug it directly into the laptop, which is an ideal. Haven’t figured out if that’s the monitor operation or if I need to connect it in a different way. Overall, this is a great value for the money.
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Reviewed in the United States on April 2, 2026
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Verified Purchase
Mystic
Lake Worth, US
★★★★★ 3
Very poor delivery and unboxing experience
Size: 34, Size: 34
2/12/26 Shipping was beyond poor. Amazon packaged this in a oversized box with no padding. Monitor box inside was damaged, but product seems ok. I was initially going to return and left a scathing feedback review for amazon delivery being beyond poor, when I requested a call there service kept hanging up on me. Shame on you Amazon, unfortunately I am removing one star for that. Now onto the real review... Monitor is sharp with no dead pixels, however the protective film is weird. So weird I thought I had received a used product, when I went to peel the film the sticker ripped and I had to carefully inspect to discover there was actually film and not someone pulling one over on amazon on a return. One star removed for that horrible film experience, it was very jarring. There is no height adjustment only tilt, which is fine nothing unexpected there. Stand is actually quality and is a Metal Injection Molding (MIM) material which is impressive for the price, not weighted plastic like some of the higher end brands. I like that there is no horrible blue light signaling the monitor is on, but that can be a turn off for some as the black levels of monitor can confuse someone into thinking it is not working. However if you are a photographer or a gamer this is a huge plus. Kudus to CRUA for doing that. I will update review upon testing to see if product needs less stars or if amazon wants to chime in on their part in this experience to add stars back. CRUA get on amazon so you can be a solid 4 stars! At this point I would recommend, but beware the film.
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Reviewed in the United States on February 12, 2026
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iNDi
Birmingham, US
★★★★★ 4
CRUA delivers in price and panel quality, but stumbles in build quality
If they could just solve their quality control issues then this might be one of the best monitors I have purchased for the price it is offered at. Major monitor brands should be absolutely ashamed that this comes within striking quality of monitors are 3-6x its price. My only advice to anyone else looking to buy this is to get an extended warranty for it because CRUA does have serious quality control issues and weak components. But the actual panel, colors, etc are way above the asking price. I am absolutely floored.
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Reviewed in the United States on May 9, 2026
K
Verified Purchase
KenjiFox
Draper, US
★★★★★ 5
This monitor is spectacular for the price. I am very pleased with it.
Size: 27 Inch
It arrived in tact and has zero blemishes or dead pixels. That's saying something when you have this many pixels too. The Freesync works great, it's fairly bright and the colors are amazing. They need to be detuned quite a lot since the gamut is way higher than most content is created for. Gaming is fantastic. I do not seem to have the advertised 1080P high FPS mode though. Perhaps they crossed up some of the promotional information for a different model. Still, I am very much enjoying 160Hz at 4k. I am playing through games again just to see them so clearly, and that's going from a 2k monitor of the same size. This display is superior. I wish the power button that's modeled to look like a joystick actually was one, don't be caught off guard by that. It's just a button. I knew that when I bought it but still. Kinda... iffy to make it look like one. I mounted the monitor on an arm. It weighs very little so it was easy. I never used the included stand, but it's very sturdy and I love that is flips vertically too. The headphone jack works nicely for my powered speakers and it switches between display port and HDMI correctly. My last monitor had to be restarted each time I went back to Display Port to get audio back. This monitor at the price I paid is insanely good. I'd been waiting for years for a good 4K panel with high refresh rate at 27". By far my favorite monitor size. I have zero intention of changing or upgrading from this panel until μLED is finally available. If this panel dies, I will get another until then.
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Reviewed in the United States on January 14, 2026

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