{"product_id":"zesto-audio-eros-300-monoblock-poweramps-pair","title":"Zesto Audio Eros 300 Monoblock Poweramps (pair) (OPEN)","description":"\u003ch1\u003eZesto Audio Eros 300 Mono Power Amplifiers (pair)\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cfigure style=\"text-align: center;\"\u003e\n\u003cblockquote\u003e\n\u003cspan\u003e“\u003c\/span\u003eConservatively rated at 150 W into 4 and 8 Ohms, the Zesto 300 features pure Class-A circuitry and uses six KT-88's per monoblock. The amplifiers belie their rated power and drive low-efficiency loudspeakers to satisfying levels with ease. There is no sonic mystery that these are tube amplifiers; tonal colors are rich and full-bodied with a life-like warmth that never devolves into softness or syrup. If anything, the amplifiers are supremely transparent and reveal an amazing amount of musical detail regardless of source.\u003cspan\u003e”\u003c\/span\u003e\n\u003c\/blockquote\u003e\n\u003cfigcaption class=\"source\"\u003e— THE ABSOLUTE SOUND\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/download_56269d02-590a-40f4-a30e-6a3c810b2413_compact.png?v=1550689084\" style=\"margin-right: 4px; float: none;\"\u003e\u003c\/p\u003e\n\u003ch3\u003eDesign Philosophy\u003c\/h3\u003e\n\u003cp\u003eThe challenge designing the Eros 300 was the conflict created when you want a lot of power, low noise and most importantly you want it to be musical. It took over 3 years to develop the Eros and 79 circuit designs later. I always look at the design from two points of view, as an audio engineer and an electrical perspective. Each design phase is based on a 50\/50 balance between the technical spec and listening to each component change.  Ultimately, the final design must sound good because who listens to sign waves anyway.\u003c\/p\u003e\n\u003ch4\u003eClass A amplifier design\u003c\/h4\u003e\n\u003cp\u003eClass A has less cross-over distortion and therefore is more musical. The tubes are always on, so you have power when you need it. Class A is fast and responsive. There is no lag, providing your music more punch, transient response, better dynamic range and transparency.\u003c\/p\u003e\n\u003ch4\u003eSecret Sauce\u003c\/h4\u003e\n\u003cp\u003eThe secret to a good power amplifier design is matching the circuits of the power supply to the amplifier. The Eros 300 is a choke based power supply with a custom toroid power transformer that gives you maximum power with no compression. It’s the most musical design because it retains all the dynamics from your sound source.\u003c\/p\u003e\n\u003ch4\u003eLots of choices\u003c\/h4\u003e\n\u003cp\u003eHow many tubes is enough? How much power is enough? I decided that 6 KT88’s and 150 Watts of Class A power was a good balance. More tubes and more power didn’t actually sound better, in fact, worse. Adding more tubes would have created more heat and less reliability.\u003c\/p\u003e\n\u003ch4\u003eWhat is EROS?\u003c\/h4\u003e\n\u003cp\u003eIn Greek mythology, EROS is the God of Love and Desire.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eClass A topology is the most musical of all amplifier designs because it has the lowest distortion.\u003c\/li\u003e\n\u003cli\u003eUnlike solid state, this tube amp efficiently transfers power by matching the output transformer to the impedance of your speakers using 4 \u0026amp; 8 Ohm taps.\u003c\/li\u003e\n\u003cli\u003eTwo parallel options for your speaker cables; the binding posts or the SpeakOn connector.\u003c\/li\u003e\n\u003cli\u003eThe Eros 300 is easy to use. There are no adjustments or tweaking with Auto Bias technology on the output tubes. It’s safe, consistent and the settings are always perfect so you can relax and enjoy the music.\u003c\/li\u003e\n\u003cli\u003eTransformer balanced XLR input offers true noise cancelling and rejection as well as ground isolation from the preamp.\u003c\/li\u003e\n\u003cli\u003eShould you need to eliminate a hum? The Eros 300 has a XLR ground switch installed for your safety. This eliminates the dangerous temptation to lift the ground from the mains.\u003c\/li\u003e\n\u003cli\u003eThe combo of Push-Pull – Ultra Linear output circuit design gives you more power \u0026amp; lower distortion.\u003c\/li\u003e\n\u003cli\u003eNo Negative Feedback in the circuit design provides better dynamic range because it doesn’t compress the music.\u003c\/li\u003e\n\u003cli\u003eNon Inverting Phase Polarity retains the directional information from the original source which gives your system punch.\u003c\/li\u003e\n\u003cli\u003eA robust choke based power supply creates maximum immediate power with no compression.\u003c\/li\u003e\n\u003cli\u003eCustom Toroid power transformer provides lower noise with plenty of available power.\u003c\/li\u003e\n\u003cli\u003eThe circuit design creates low noise levels with a wide frequency response. You will notice this in the really dark, quiet passages in your music.\u003c\/li\u003e\n\u003cli\u003eGold pin sockets are more reliable because gold doesn’t oxidize when it heat cycles.\u003c\/li\u003e\n\u003cli\u003eA matched sextet (6) output tubes provides a synchronized balance for the lowest distortion and maximum output of power.\u003c\/li\u003e\n\u003cli\u003eAn extensive grounding scheme is designed into the power supply, wiring and all tube circuitry.\u003c\/li\u003e\n\u003cli\u003eElegantly designed, heavy duty 14 \u0026amp; 16 gauge zinc plated, fully grounded steel enclosure isolates external noise and vibration.\u003c\/li\u003e\n\u003cli\u003eAll fuses are easily accessible\u003c\/li\u003e\n\u003cli\u003eIt’s ready to enjoy with 50 hours of factory burn in on all circuits and vacuum tubes.\u003c\/li\u003e\n\u003cli\u003eEach unit is hand built “Made in the USA”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eSpecifications per Amp\u003c\/h3\u003e\n\u003ch4\u003eOutput\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePure Class A\u003c\/li\u003e\n\u003cli\u003e150 Watts per amp\u003c\/li\u003e\n\u003cli\u003e4 and 8 Ohm output taps\u003c\/li\u003e\n\u003cli\u003e8 and 5 Amp Slow blow fuses for outputs\u003c\/li\u003e\n\u003cli\u003eThree 5 way binding post\u003c\/li\u003e\n\u003cli\u003eOne SpeakOn connector\u003c\/li\u003e\n\u003cli\u003eNon inverting output phase polarity\u003c\/li\u003e\n\u003cli\u003ePush-Pull and Ultra-Linear design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInputs\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eTransformer floating XLR input\u003c\/li\u003e\n\u003cli\u003eBalanced inputs with pin 2 hot, impedance of 12K Ohms\u003c\/li\u003e\n\u003cli\u003eSingle Ended input, impedance of 100K Ohms\u003c\/li\u003e\n\u003cli\u003eXLR ground lift switch on balanced input\u003c\/li\u003e\n\u003cli\u003e1.8 Volts RMS input to reach rated output\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eDetailed Specs\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMonaural\u003c\/li\u003e\n\u003cli\u003eAuto bias\u003c\/li\u003e\n\u003cli\u003eNo negative feedback\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz to 50Khz ~ 2db\u003c\/li\u003e\n\u003cli\u003eTotal Harmonic Distortion: ~ 0.43% at 1W output into 8 Ohms\u003c\/li\u003e\n\u003cli\u003eGain of 26dB\u003c\/li\u003e\n\u003cli\u003eNoise level \u0026gt; 5 mV RMS into 8 Ohms with input shorted\u003c\/li\u003e\n\u003cli\u003e1% metal film resisters throughout\u003c\/li\u003e\n\u003cli\u003ePolypropylene capacitors throughout the audio path\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003ePower\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCustom Toroidal power transformer with global mains\u003c\/li\u003e\n\u003cli\u003eChoke based power supply design\u003c\/li\u003e\n\u003cli\u003e120 Volts AC mains\u003c\/li\u003e\n\u003cli\u003eOptional factory installed 220V, 230V, 240V 50\/60Hz\u003c\/li\u003e\n\u003cli\u003ePower consumption at rated output: 360 Watts\u003c\/li\u003e\n\u003cli\u003ePower consumption at idle: 348 Watts\u003c\/li\u003e\n\u003cli\u003eOn\/Off switch conveniently located on front panel\u003c\/li\u003e\n\u003cli\u003e3 pin IEC power connector with fuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eActive Components\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMatched sextet, set of six (6) KT88’s vacuum tubes\u003c\/li\u003e\n\u003cli\u003eTwo (2) Gold pin ECC82s (12AU7) vacuum tubes\u003c\/li\u003e\n\u003cli\u003eHigh quality gold pin ceramic sockets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eOther Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eEach unit is made by hand\u003c\/li\u003e\n\u003cli\u003e50 hour factory burn in on all circuits and vacuum tubes\u003c\/li\u003e\n\u003cli\u003eDimensions: 17″ W X 20″ D X 10 ” H\u003c\/li\u003e\n\u003cli\u003eWeight: 64 lb (29.03 kg)\u003c\/li\u003e\n\u003cli\u003eShipping weight: 80 lb (36.28 kg)\u003c\/li\u003e\n\u003cli\u003e14 and 16 gauge zinc-plated steel enclosure\u003c\/li\u003e\n\u003cli\u003eTwo year limited warranty\u003c\/li\u003e\n\u003cli\u003eSix month warranty on vacuum tubes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Zesto Audio","offers":[{"title":"Default Title","offer_id":31857678288,"sku":"ZA EROS 300 OPEN","price":19601.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/eros-300-croped.jpg?v=1741632280","url":"https:\/\/upscaleaudio.pro\/products\/zesto-audio-eros-300-monoblock-poweramps-pair","provider":"Upscale Audio","version":"1.0","type":"link"}