{"id":4270,"date":"2015-01-06T19:36:58","date_gmt":"2015-01-06T19:36:58","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=4270"},"modified":"2015-01-06T19:36:58","modified_gmt":"2015-01-06T19:36:58","slug":"300b-amp-the-journey-starts-here","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2015\/01\/06\/300b-amp-the-journey-starts-here\/","title":{"rendered":"300B Amp: the journey starts here"},"content":{"rendered":"<p>I can&#8217;t get away from my big HT power supplies. This time the HT +400V for the 300B amp is here. Lots of Lundahl iron and a lovely hybrid bridge made of mercury rectifiers and damper valves. Yes, I&#8217;m in love with the blueish colour of the 816s. Despite they are mercury rectifiers, I know.<\/p>\n<div class=\"tiled-gallery type-square tiled-gallery-unresized\" data-original-width=\"840\" data-carousel-extra='{&quot;blog_id&quot;:1,&quot;permalink&quot;:&quot;https:\\\/\\\/www.bartola.co.uk\\\/valves\\\/2015\\\/01\\\/06\\\/300b-amp-the-journey-starts-here\\\/&quot;,&quot;likes_blog_id&quot;:35997060}' itemscope itemtype=\"http:\/\/schema.org\/ImageGallery\" > <div class=\"gallery-row\" style=\"width: 840px; height: 420px;\" data-original-width=\"840\" data-original-height=\"420\" > <div class=\"gallery-group\" style=\"width: 420px; height: 420px;\" data-original-width=\"420\" data-original-height=\"420\" > <div class=\"tiled-gallery-item \" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/www.bartola.co.uk\/valves\/2015\/01\/06\/300b-amp-the-journey-starts-here\/img_0492\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"416\"> <meta itemprop=\"height\" content=\"416\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"4271\" data-orig-file=\"https:\/\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg\" data-orig-size=\"1280,960\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"IMG_0492\" data-image-description=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?fit=300%2C225&#038;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?fit=840%2C630&#038;ssl=1\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?w=416&#038;h=416&#038;crop=1&#038;ssl=1\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?resize=50%2C50&amp;ssl=1 50w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?zoom=2&amp;resize=416%2C416&amp;ssl=1 832w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0492.jpeg?zoom=3&amp;resize=416%2C416&amp;ssl=1 1248w\" width=\"416\" height=\"416\" loading=\"lazy\" data-original-width=\"416\" data-original-height=\"416\" itemprop=\"http:\/\/schema.org\/image\" title=\"IMG_0492\" alt=\"IMG_0492\" style=\"width: 416px; height: 416px;\" \/> <\/a> <\/div> <\/div> <div class=\"gallery-group\" style=\"width: 420px; height: 420px;\" data-original-width=\"420\" data-original-height=\"420\" > <div class=\"tiled-gallery-item \" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/www.bartola.co.uk\/valves\/2015\/01\/06\/300b-amp-the-journey-starts-here\/img_0488\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"416\"> <meta itemprop=\"height\" content=\"416\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"4272\" data-orig-file=\"https:\/\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg\" data-orig-size=\"1280,960\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"IMG_0488\" data-image-description=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?fit=300%2C225&#038;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?fit=840%2C630&#038;ssl=1\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?w=416&#038;h=416&#038;crop=1&#038;ssl=1\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?resize=50%2C50&amp;ssl=1 50w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?zoom=2&amp;resize=416%2C416&amp;ssl=1 832w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/01\/IMG_0488.jpeg?zoom=3&amp;resize=416%2C416&amp;ssl=1 1248w\" width=\"416\" height=\"416\" loading=\"lazy\" data-original-width=\"416\" data-original-height=\"416\" itemprop=\"http:\/\/schema.org\/image\" title=\"IMG_0488\" alt=\"IMG_0488\" style=\"width: 416px; height: 416px;\" \/> <\/a> <\/div> <\/div> <\/div> <\/div>\n<p>I promised the wife I&#8217;d get a smaller amp, that was my excuse for the 300B reference system. Still this is not going to be small, however, it will be compared to the 814 SE Amp!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I can&#8217;t get away from my big HT power supplies. This time the HT +400V for the 300B amp is here. Lots of Lundahl iron and a lovely hybrid bridge made of mercury rectifiers and damper valves. Yes, I&#8217;m in love with the blueish colour of the 816s. Despite they are mercury rectifiers, I know. &hellip; <a href=\"https:\/\/www.bartola.co.uk\/valves\/2015\/01\/06\/300b-amp-the-journey-starts-here\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;300B Amp: the journey starts here&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[673,12,158],"tags":[610,675,674,676,678,677,679,115],"class_list":["post-4270","post","type-post","status-publish","format-standard","hentry","category-300b-amp","category-dht-valves","category-se-designs","tag-300b","tag-300b-amp","tag-300b-se","tag-676","tag-816-hybrid-supply","tag-816-tube-supply","tag-damper-tube","tag-ht-supply"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-16S","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4270","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/comments?post=4270"}],"version-history":[{"count":3,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4270\/revisions"}],"predecessor-version":[{"id":4275,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4270\/revisions\/4275"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=4270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=4270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=4270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}