PrimaLuna EVO 300-4 Power

PrimaLuna EVO 300-4 Poweramplifier er den næststørste effektforstærker i den nye EVO-serie. Her får du hele 44 watts x 2 i stereo. 6 x 12AU7 og 4 x EL34 rør, XLR Input, Swiss Made Wiring, Adaptive AutoBias, KT150 Compatible, Stereo to Mono Switching, Point to Point Wiring, Bad Tube Indicator  m.m.

Tungt Hi-Fi til lette priser. PrimaLuna har skruet yderligere en tand op for alt det gode og leverer nu en ny EVO-serie med en hidtil uset høj kvalitet. PrimaLuna har på rekordtid formået, at slå sit navn fast på verdensmarkedet, som et absolut værdigt alternativ til de store spillere – og så til en brøkdel af prisen!

• Stereo to Mono Switching
• XLR Input
• Swiss Made Wiring
• Takman Resistors
• AC Offset Killer
• Triode/Ultra-Linear Switching
• Adaptive AutoBias
• KT150 Compatible
• Point to Point Wiring
• Bad Tube Indicator
• Wide-Bandwidth Output Transformers (largest)
• Custom Potted Toroidal Power Transformers (largest)

Med PrimaLuna får du ikke bare markedets mest stabile rørforstærkere, men også dem der er absolut nemmest og billigst at vedligeholde.

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Compare PrimaLuna construction to any other brand, at any price. You'll be amazed.

Specifications - PrimaLuna EVO 300-4 Poweramp:
Power: Stereo Ultra-linear: 44 watts x 2 (EL34) (8Ω, 1% THD)
Power: Stereo Triode: 22 watts x 2 (EL34) (8Ω, 1% THD)
Power: Mono Ultra-linear: 85 watts (EL34) (8Ω, 1% THD)
Power: Mono Triode: 45 watts (EL34) (8Ω, 1% THD)
Inputs:
1x Stereo RCA
1x Stereo XLR
Outputs:
4, 8, & 16 Ohm (stereo)
2, 4, & 8 Ohm (mono)
Freq. Response:
10Hz-70kHz +/- 1dB
8Hz-75kHz +/- 3dB
THD:
< 0.1% @ 1W (stereo)
< 0.17% @ 1W (mono)
< 2% @ Rated Power (stereo/mono)
S/N Ratio: 91 dB, 105 dBA
Input Sensitivity:
870mV (stereo)
880mV (mono)
Input Impedance: 100kΩ
Power Consumption:
290 watts (EL34)
300 watts (KT88)
330 watts (KT120)
340 watts (KT150)
Standard Tube Complement:
6 x 12AU7
4 x EL34
Dimensions (WxHxD): 39,1 x 20,5 x 40,3 cm
Weight: 29,9 kg

*** PrimaLuna EVO Poweramplifier Series ***

Dual Output Transformers
The design team at PrimaLuna faced a formidable challenge: How to match (or exceed) the sonic signature of its integrated and stereo amps, in a set of monoblock amplifiers with twice the power. This was no small feat because the stereo amps possessed a natural and highly engaging midrange, outstanding soundstage, extended and articulate bass and highs, and a musicality reminiscent of live performances. As many designers can attest, it’s quite easy to take a step backwards rather than forwards when creating a more powerful amplifier.

While many designers may opt for larger transformers to double the output power, the PrimaLuna team decided against that approach knowing big output transformers sometimes don’t behave as well or sound as good as their smaller brethren. They opted instead to use two discrete audio channels in one chassis, and paralleled them at the loudspeaker terminals. Building an amp with two output transformers per monoblock amp is almost unheard of due to one simple reason. Cost. (Note: We know of one company doing it in their $15,000 per pair amps)

The sonic benefits are significant. This design adds a 16-ohm tap to each transformer, which when paralleled in this circuit design, resulted in an 8 Ohm output. You now have three sets of speaker taps: 2 Ohm, 4 Ohm, and 8 Ohm; to get a perfect "handshake" from the amps to your speakers. The ability to drive planer and ribbon speakers is unmatched.

This approach created other challenges. You risk a percentage of power from one free-running transformer pushing into the other, due to output voltage differences caused by circuit tolerances and tube aging. To deal with this problem, the team developed a specific cross-coupled positive/negative feedback scheme to balance out both channels perfectly, while distortion is lowered significantly in the slipstream. In addition, newly designed pre-stages improved the drive capacity to the power tubes, resulting in even lower distortion levels, without the need for extra negative feedback. The circuit was inherently more stable and virtually immune to drive imbalance and the distortions that accompany tube aging.

This innovative twin-channel-summing approach with cross-coupled positive/negative feedback not only resulted in surprisingly low harmonic distortion, further pushing the envelope of performance of all PrimaLuna mono amps.

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.

CUSTOM TOROIDAL POWER TRANSFORMERS
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.

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
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.

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, even the KT120 (the EVO 100 is not KT150 compatible). A future-proof design, PrimaLuna is compatible with NEW tube types not even thought of today!