PrimaLuna EVO 400 Tube Integrated Amplifier
SKU: 69912914306

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: 69912914306

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tori
Port Orchard, US
★★★★★ 2
A shame
Color: Blue, Color: Blue
This product was disappointing, giving 2 stars because it does seem to be a fun toy for dogs; however, within just a day of me giving this to my two 20 pound dogs, they ripped up the top, pulling off shreds of plastic. Luckily this was under supervision so neither of them ate any of the pieces but I could see this easily being a hazard for dogs, especially smaller ones. Whether choking or ingesting, this could be extremely dangerous. Not very good quality.
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Reviewed in the United States on December 1, 2025
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Extreme Public Adjusters
Port Orchard, US
★★★★★ 5
Must have dog toy!
Size: Extra Small, Style: Bristle Bone
I bought the PetSafe Busy Buddy Treat Ring Variety Pack for our 15 lb Shih Tzu and he absolutely LOVES it. The second he sees me pull it out, he gets so excited. We use it mostly to keep him entertained while we pull our cockatiels out of their cage for the day. This is such a great toy for mental stimulation and keeping him busy. It’s interactive, keeps him focused, and makes treat time last longer instead of him just inhaling snacks in two seconds. The rings are extremely durable, they treats fit really well, and it’s nice having a variety pack. It’s also a great option for small dogs who need enrichment without it being too heavy or difficult to use. The rings have no odd smell like other toys do. They come in an array of sizes and this particular one has little bristles that work as a tooth brush while he is using it as well. Highly recommend if you’re looking for an enrichment toy, treat toy, or something to keep your dog entertained at home especially if you are using it for what we are.
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Reviewed in the United States on January 15, 2026
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Robyn Elam
Los Angeles, US
★★★★★ 5
The best safe, chew toy that offers variety and a challenge to keep your dog occupied.
Size: Medium, Style: Bristle Bone
My 60-lb, male Golden Retriever LOVES this bone. My first mistake was I put it together too tight; second mistake I loosened it too much and he had it pulled apart in no time. Now, it's just right. He wasn't sure about it, honestly, for about 5 hours. He is a chewer, he gets bored quickly, he's such a great dog I wanted him to have something indestructible, safe, and allow him different types of chewing in one toy. OH MY GOODNESS! This toy checks all the boxes. I did think I bought a Large; turned out to be a medium which is really perfect, for 50 to 90 lb dogs. And what came with this purchases was a bag of the treat rings. So glad I did! Finding the right chew toy to occupy this adorable boy has been a challenge. PetSafe, you met the challenge! Thank you so much!!
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Reviewed in the United States on October 24, 2025
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Mary
Whiting, US
★★★★★ 5
Great to stop Doggie boredom/barking
Size: Extra Small, Style: Bristle Bone
For tiny dogs, these are great ways to entertain the pups and get them to clean their own teeth; I have had one for 5 years and the dogs never were able to harm the white parts. I gave it to a pup that was homeless and I didn't have the heart to take it back later - It is quiet as a mouse and fits perfectly in tiny dog mouths. You do have to have their raw hide inserts but they're easy to find, not expensive, and again is great for boredom time for the dogs.
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Reviewed in the United States on June 9, 2026
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Jessica Clapp
Fort Morgan, US
★★★★★ 4
Favorite chew toy
Size: Medium, Style: Bristle Bone
Pros: this is our dog’s favorite toy. She loves to eat but isn’t much for chewing. At 2 years old, her teeth were already looking pretty bad because she swallows everything whole. That makes most chew toys dangerous. This is the first toy that she chews aggressively. At first we had to give it to her in short spurts because her gums bled. That’s stopped, her teeth and gums look healthier, and she carries it around with or without the inserts. She loves it. The con: the bristles come apart after aggressive chewing. She swallowed some and I caught the other side coming off. So whenever I see this on sale, I buy several new ones. I don’t try to make it last and I check it often for damage.
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Reviewed in the United States on May 17, 2026

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