{"id":159475,"date":"2024-04-24T15:55:08","date_gmt":"2024-04-24T15:55:08","guid":{"rendered":"https:\/\/www.techweekmag.com\/?p=159475"},"modified":"2024-04-25T03:15:00","modified_gmt":"2024-04-25T03:15:00","slug":"sw1x-lpu-iv-phono-the-ultimate-level-4-phono-stage","status":"publish","type":"post","link":"https:\/\/www.stereoindex.com\/tech\/hi-fi\/sw1x-lpu-iv-phono-the-ultimate-level-4-phono-stage\/","title":{"rendered":"SW1X LPU IV Phono: The ultimate level 4 phono stage"},"content":{"rendered":"<p>British company\u00a0SW1X Audio Design\u00a0has unveiled the ultimate\u00a0SW1X LPU IV\u00a0Phono\u00a0tube phono stage 4, designed for high output moving magnet (MM) or moving coil (MC) cartridges.\u00a0In addition to the fully balanced signal output transformer (OPT) design used in the LPU III, the LPU IV Phono circuitry is based on more powerful eight-pin tubes.\u00a0Instead of the two amplification stages used in the LPU I, II and III phono stages, the LPU IV Phono has three amplification stages.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2023\/04\/28_techweek.jpg\" alt=\"Image\" \/><\/p>\n<p>The input stage of the SW1X LPU IV Phono is based on two 6SJ7 tubes, an eight-pin version of the EF86 pentode.\u00a0The intermediate stage is made on the popular 6SN7 double triode, and the output stage is powered by a pair of powerful 6F6 tubes.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2023\/04\/29_techweek.jpg\" alt=\"Image\" \/><\/p>\n<p>In addition to the basic version (\u00a0\u00a318k\u00a0), the\u00a0SW1X LPU IV\u00a0Phono\u00a0is available in\u00a0Special\u00a0(\u00a0\u00a324k\u00a0),\u00a0Classic\u00a0(\u00a0\u00a334,200\u00a0) and\u00a0Sign\u00a0a\u00a0ture\u00a0(\u00a0\u00a346,200\u00a0) versions, which differ in the number of chokes, transformers over high class, the material of the windings of transformers and the careful selection and manufacturers of components.<\/p>\n<p>You can also choose to finish the component&#8217;s front panel in\u00a0<i>silver<\/i>\u00a0or\u00a0<i>matte black<\/i>\u00a0.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2023\/04\/31_techweek.jpg\" alt=\"Image\" \/><\/p>\n<h3>SW1X LPU IV Phono stage Specifications:<\/h3>\n<ul>\n<li>Three stages of amplification<\/li>\n<li>Bulb set: 2 x SJ7, 1 x 6SN7, 2 x 6F6, 1 x 5U4GB, 1 x 5Y3<\/li>\n<li>Specially designed SW1X Audio Design signal transformers with Super HiB DC core and silver windings<\/li>\n<li>Black Gate VK capacitors in the power supply<\/li>\n<li>Non-magnetic niobium resistors AN with a power of 2 W on a bakelite board<\/li>\n<li>Super HiB mains transformers with double C-Core core for power supplies<\/li>\n<li>Interstage silver foil capacitors<\/li>\n<li>AN 2W silver non-magnetic tantalum resistors<\/li>\n<li>2 mains transformers and 5 chokes<\/li>\n<li>Active RIAA correction<\/li>\n<li>Input impedance: 47 kOhm<\/li>\n<li>Output impedance: &lt; 20 ohm<\/li>\n<li>Total gain: 46-52dB depending on lamps selected<\/li>\n<li>Maximum input voltage: 350 mV<\/li>\n<li>Output noise, unweighted (mVrms): &lt;0.5<\/li>\n<li>Maximum power consumption (W): 55<\/li>\n<li>Dimensions (W x H x D): 440 x 140 x 410 mm<\/li>\n<li>Weight: 21.5 kg<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>British company\u00a0SW1X Audio Design\u00a0has unveiled the ultimate\u00a0SW1X LPU IV\u00a0Phono\u00a0tube phono stage 4, designed for high output moving magnet (MM) or moving coil (MC) cartridges.\u00a0In addition to the fully balanced signal output transformer (OPT) design used in the LPU III, the LPU IV Phono circuitry is based on more powerful eight-pin tubes.\u00a0Instead of the two amplification [&hellip;] <a class=\"g1-link g1-link-more\" href=\"https:\/\/www.stereoindex.com\/tech\/hi-fi\/sw1x-lpu-iv-phono-the-ultimate-level-4-phono-stage\/\">More<\/a><\/p>\n","protected":false},"author":10404,"featured_media":190292,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[642],"tags":[779],"class_list":{"0":"post-159475","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-hi-fi","8":"tag-news"},"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/159475","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/users\/10404"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/comments?post=159475"}],"version-history":[{"count":0,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/159475\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media\/190292"}],"wp:attachment":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media?parent=159475"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/categories?post=159475"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/tags?post=159475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}