Triode and Single Ended Triode (SET) amps are popular for their warmer, fuller, and easy to settle into sound. 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.
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.
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.
Power transformers generate two types of noise, magnetic and acoustic. Toroids radiate about 1/10 the magnetic field that pollutes music and obscures detail. AAll 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.
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. PrimaLuna output transformers are custom-designed, wound in-house, and massive.
PrimaLuna custom-winds our own massive toroidal power transformers that are low in hum and EMI. Our engineers designed the AC Offset Killer to lower transformer noise. The result... space. The resonance of an acoustic guitar or violin string that seems to trail on forever.
PrimaLuna's Adaptive AutoBias is a true, smart technology employing an array of sensors to monitor tubes and make adjustments seamlessly in real time. It is truly "adaptive" by addressing "tube pinch off" at higher volumes, reducing distortion by over 50% and greatly extending tube life. The result is low to no maintenance, long tube life, and the lowest possible distortion for amazing sound.
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.
Tube life is simply a matter of how hard you run the tubes. 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. We proudly tell you our tubes run at just about 417 volts for the plates and screens.
Ask any seasoned tube-head what the most musical output tube is and they will most certainly declare it the EL34. 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.
|70 watts x 2 (EL34)
(8Ω, 1% THD)
|38 watts x 2 (EL34)
(8Ω, 1% THD)
|Inputs||5x Stereo RCA
Stereo RCA HT Bypass
|Outputs||4 & 8 Ω
RCA Stereo/Mono Subwoofer
Stereo RCA Tape Out
|Freq. Response||7Hz-65kHz +/- 1dB|
|THD||< 0.1% @ 1W
< 2% @ Rated Power
|S/N Ratio||93 dB, 93 dbA|
|Input Sensitivity||320 mV (EL34)|
|Power Consumption||470 watts: EL34
480 watts: KT88
540 watts: KT120
550 watts: KT150
|Tube Complement||6 - 12AU7
8 - EL34
|Dimensions (WxHxD)||15.2" x 8.1" x 15.9"|