Is this a miracle? Is this a unique situation where a company just happens to stumble upon a perfect design and execution? No. It’s another PrimaLuna. And our fifth product in a row to earn a coveted Stereophile Class A rating. No other company has ever had five products listed Class A simultaneously, let alone when every product is under $5,000.
Herb declared “Equally obvious was how clearly and powerfully the ProLogue Premium reproduced bass. Even through small speakers, bass scale – the ability of deep sounds to also be big sounds, when they’re supposed to – was exceptional. High frequencies also had a captivating purity.”
So how does it happen? Bandwidth baby. And we have it. No other brand will ever sound like a PrimaLuna because they don’t have our custom designed output transformers that we wind in-house. We don’t care about power. You don’t use it. High power just burns up tubes and causes bummed out owners. We have customers using 36 watt PrimaLuna amps to drive subwoofers!
Couple that with our exclusive Adaptive AutoBias, long tube life, and build quality that shames amplifiers costing $10,000, and you have an amplifier purchase of a lifetime.
Don’t buy something because it gets good reviews. There’s no such thing as a bad review. And don’t buy into fairy dust. Want to know what’s best? It’s what reviewers use in their own systems. Do some research. You will find reviewers use PrimaLuna more than any other brand.
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.
PROLOGUE CLASS 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.
PROLOGUE CLASS 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
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.
- Switchable stereo or mono power amplifier
- 2 x 35 watt in STEREO. 1 x 70 watt in MONO
- Inputs: 2 x RCA pre amp input. MONO – 1 x RCA pre amp input
- Outputs: STEREO – 4/8/16 ohm speaker taps. MONO – 2/4/8 ohm taps
- Power section: 4 x EL34 tubes. Pre section: 4 x 12AU7 tubes
- Adaptive AutoBias, EL34/KT88 bias switch, SoftStart circuit
- BTI-circuit – bad tube indicator via LED in front of each tube
- PTP-circuit – power transformer protection circuitry
- Premium parts, hand-made with finest point-to-point wiring, 5 coat finish
Dimensions: 468mm x 305mm x 577mm (WxHxD)