{"id":149789,"date":"2023-10-24T17:46:22","date_gmt":"2023-10-24T16:46:22","guid":{"rendered":"https:\/\/www.techweekmag.com\/?p=149789"},"modified":"2023-10-25T07:10:14","modified_gmt":"2023-10-25T06:10:14","slug":"bat-vk-80i-amplifier-automatic-biasing-on-6c33c-b-output-triodes","status":"publish","type":"post","link":"https:\/\/www.stereoindex.com\/tech\/hi-fi\/bat-vk-80i-amplifier-automatic-biasing-on-6c33c-b-output-triodes\/","title":{"rendered":"BAT VK-80i Amplifier: Automatic Biasing on 6C33C-B Output Triodes"},"content":{"rendered":"<p>The Balanced Audio Technology (BAT) tube amplifier, model VK-80i, uses 6C33C-B output triodes with a fully balanced signal path.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8863 aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/10\/101_techweek.jpg\" alt=\"\" width=\"1000\" height=\"562\" \/><\/p>\n<p>For 55 watts per channel, the VK-80i uses four 6C33C-B outputs, which means it&#8217;s far superior to the common 6550\/KT90 tube tetrodes.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8864 aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/10\/102_techweek.jpg\" alt=\"\" width=\"750\" height=\"670\" \/><\/p>\n<p>There are no traditional fuses in the circuit &#8211; in case of abnormal operation parameters of the output stage, the VK-80i goes into safe mode.\u00a0After that, it is enough to turn it off and on again, which will restore normal operation.\u00a0The fuseless protection circuit is combined with an advanced automatic bias circuit.\u00a0There is no need to manually set and adjust the correct output lamp offset.\u00a0The auto offset circuitry also ensures that your VK-80i will sound great for the first few minutes of listening.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8865 aligncenter\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/10\/103_techweek.jpg\" alt=\"\" width=\"1000\" height=\"562\" \/><\/p>\n<p>The manufacturer has documented a THD level at full power of 3%.\u00a0Frequency range &#8211; from 8 Hz to 200 kHz, power consumption 400 W in standby mode, 800 W &#8211; at full power.\u00a0Input switching &#8211; 1 XLR, 3 RCA.\u00a0Volume control &#8211; resistive ladder, 90 steps, 1 dB per step.\u00a0Comes with a full metal remote control.\u00a0The Balanced Audio Technology (BAT) tube amplifier, model VK-80i, is available in silver or black.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Balanced Audio Technology (BAT) tube amplifier, model VK-80i, uses 6C33C-B output triodes with a fully balanced signal path. For 55 watts per channel, the VK-80i uses four 6C33C-B outputs, which means it&#8217;s far superior to the common 6550\/KT90 tube tetrodes. There are no traditional fuses in the circuit &#8211; in case of abnormal operation [&hellip;] <a class=\"g1-link g1-link-more\" href=\"https:\/\/www.stereoindex.com\/tech\/hi-fi\/bat-vk-80i-amplifier-automatic-biasing-on-6c33c-b-output-triodes\/\">More<\/a><\/p>\n","protected":false},"author":10404,"featured_media":149790,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[642],"tags":[779],"class_list":{"0":"post-149789","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-hi-fi","8":"tag-news"},"acf":[],"aioseo_notices":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/149789","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=149789"}],"version-history":[{"count":0,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/149789\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media\/149790"}],"wp:attachment":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media?parent=149789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/categories?post=149789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/tags?post=149789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}