{"product_id":"phasemation-ma-3000-monaural-power-amplifiter","title":"Phasemation MA-3000 Monaural Power Amplifiter","description":"\u003ch3 class=\"product-title\" style=\"text-align: center;\"\u003e\u003cem\u003e\u003cstrong\u003e300B Parallel Single-ended Tube Monaural Power Amplifier which can educe the music reality and even the artist's passion\u003c\/strong\u003e\u003c\/em\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eIn the world of audio amplifiers, the wide kinds of semiconductor amplifiers, tube amplifiers, etc. are released. Therefore, the respective audio features can be enjoyed as a hobby.　Especially tube power amplifiers adopting a tube called 'fine tube' such as 2A3 or 300B have well-established sound quality that cannot be expressed by semiconductor amplifiers and they are accepted consistently even in the modern era.　\"We would like to taste the best sound produced by a 300B amplifier composed by a parallel single-ended circuit adopting 300B which is the best tube among them and a circuit strongly driven by a transformer-coupled circuit adopting 2A3.\" In 2016, we have developed the monaural power amplifier, MA-2000, to respond to the user's thoughts.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" class=\"main_box\"\u003e\n\u003ch3 style=\"text-align: left;\"\u003eMain Feature:\u003c\/h3\u003e\n\u003carticle\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003e300B parallel single-ended stage for fixed-bias single pure class-A operation\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eIn order to compose the single pure class-A circuit so that the innate goodness of 300B is expressed with the simplest operation, two fixed bias power supplies are allocated individually for the ended-tube of PSVANE WE300B and therefore the setup of the optimum operating point and stable operation are secured. Consequently, this strong power greater than 25W outputted by a parallel operation can be supplied for driving a speaker. By adding the power supply system having a timer control (for 1 minute) at the time of turning the power supply on, the operation with further high reliability is achieved.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eSOVTEK 2A3 for the transformer-coupled circuit driving PSVANE WE300B ended-tube optimally\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eWe utilize 2A3 which is well-established even as an ended tube for a transformer–coupled circuit to drive the ended tube 300B, set 2A3 to the optimum operating point, and secure the DC stability by supplying the individual fixed bias to 300B parallel circuits. Therefore, the speaker is driven with unshakable stability.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eComposing the non-feedback amplifier by adopting triode tubes in all stages\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eWe compose the non-feedback amplifier by adopting triode tubes, 12AX7SRPP+2A3+300B, in all stages. Therefore, the ability for reproducing dynamic and very expressive music is provided only possible from the non-feedback circuit.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eAdopting the output transformer and inter-stage transformer made by LUNDAHL in Sweden\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eBecause the inter-stage and output transformers made by LUNDAHL in Sweden are proper to compose this equipment and suited for the sound quality to be aimed by us, we have adopted them.　The fixed bias circuits are allocated individually for the ended-tube of 300B with utilizing the independent winding structure at the secondary side of the inter-stage transformer and therefore the setup of the optimum operating point and stable operation are secured by reading the meter directly.　The independent terminals able to drive an 8 or 4 ohm speaker are provided by utilizing the independent winding structure at the secondary side of the output transformer.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eComposed of two independent power choke transformers\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eBecause the power supplies from the independent power choke transformer are individually supplied for the driver stage (2A3) and power stage (300B parallel single-ended), the mutual interference between the input signal amplifier circuit and the speaker drive circuit is purged. Therefore, signals of various levels from infinitesimal signals to high power signals are amplified clearly.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eThoroughgoing design for decreasing the noise\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eWe have adopted the thoroughgoing design for decreasing the noise as follows:\u003cbr\u003e-Rectifier tube 5R4G which does not generate a switching noise in principle against a high voltage\u003cbr\u003epower supply\u003cbr\u003e-Rectifier circuits composing of choke transformers\u003cbr\u003e-DC ignition for heaters driven by complete DC power supplies for all tubes.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eTimer indicator and appearance\u003c\/h4\u003e\n\u003cp style=\"text-align: left;\"\u003eThe color of the timer indicator is red at the time of standby and changes to blue after 1 minute as a starting time. In addition, the impressive front glass with placing the two-color LED indicator on the front panel is designed as a stately appearance.\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003ch4 style=\"text-align: left;\"\u003eMA-2000 Block diagram\u003c\/h4\u003e\n\u003c\/article\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003cp\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/www.phasemation.com\/img\/product\/ma-2000\/diagram.jpg\"\u003e\u003c\/p\u003e\n\u003c\/article\u003e\n\u003carticle\u003e\n\u003cp\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/www.phasemation.com\/img\/product\/ma-2000\/photo01.png\"\u003e\u003c\/p\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"main_box\"\u003e\n\u003ch3 style=\"text-align: left;\"\u003eProduct Specification:\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 235.126px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e300B Parallel Single-ended Monaural Power Amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eInput impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e47k ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eGain\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e27dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eResidual noise\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e200µV or less: A-NET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eRated output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e25W (THD: 5%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eFrequency characteristics\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e10Hz to 40kHz (+0,–3dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eOutput impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e4 ohms, 8 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003ePower consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e160W（230VAC, 50 to 60Hz）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eInput\/Output terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003eTerminals made by FURUTECH CO.,LTD.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eExternal dimensions (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e270（W） x 245（H） x 433（D）\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003e20ｋｇ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 33.3757%; height: 19.5938px;\"\u003e\u003cstrong\u003eAccessories\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.7257%; height: 19.5938px;\"\u003eAC power cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Phasemation","offers":[{"title":"Default Title","offer_id":47387160969365,"sku":"MA-3000","price":49975.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/photo_3.png?v=1779849330","url":"https:\/\/houseofstereo.com\/es\/products\/phasemation-ma-3000-monaural-power-amplifiter","provider":"House Of Stereo","version":"1.0","type":"link"}