{"id":2007,"date":"2013-10-06T10:10:01","date_gmt":"2013-10-06T09:10:01","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=2007"},"modified":"2013-10-06T10:10:01","modified_gmt":"2013-10-06T09:10:01","slug":"sx-201a-sylvania","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2013\/10\/06\/sx-201a-sylvania\/","title":{"rendered":"SX-201a Sylvania"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"215\" data-permalink=\"https:\/\/www.bartola.co.uk\/valves\/2012\/06\/04\/01a-preamplifier\/20120604-232610-jpg\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?fit=1536%2C1024&amp;ssl=1\" data-orig-size=\"1536,1024\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;5.6&quot;,&quot;created_timestamp&quot;:&quot;1335654634&quot;,&quot;focal_length&quot;:&quot;80&quot;,&quot;iso&quot;:&quot;100&quot;,&quot;shutter_speed&quot;:&quot;6&quot;}\" data-image-title=\"01a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?fit=840%2C559&amp;ssl=1\" class=\"alignleft size-large wp-image-215\" alt=\"01a\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610-1024x682.jpg?resize=584%2C388\" width=\"584\" height=\"388\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?resize=1024%2C682&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?resize=450%2C300&amp;ssl=1 450w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2012\/06\/20120604-232610.jpg?w=1536&amp;ssl=1 1536w\" sizes=\"auto, (max-width: 584px) 85vw, 584px\" \/><\/a>I have a pair of Sylvania&#8217;s SX-201a which sound superb. My\u00a0preferred\u00a0ones for 01apreamps. I&#8217;m looking at revamping my <a title=\"01a preamp (revisited 2013)\" href=\"http:\/\/www.bartola.co.uk\/valves\/2013\/01\/19\/01a-preamp-revisited-2013\/\">01a<\/a>\u00a0line-stage\u00a0shortly. Here is a trace of the anode curves for one of them:<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2008\" data-permalink=\"https:\/\/www.bartola.co.uk\/valves\/2013\/10\/06\/sx-201a-sylvania\/sx-201a\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?fit=657%2C642&amp;ssl=1\" data-orig-size=\"657,642\" data-comments-opened=\"1\" data-image-title=\"sx-201a\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?fit=657%2C642&amp;ssl=1\" class=\"alignleft size-full wp-image-2008\" alt=\"sx-201a\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?resize=657%2C642\" width=\"657\" height=\"642\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?w=657&amp;ssl=1 657w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?resize=300%2C293&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2013\/10\/sx-201a.png?resize=307%2C300&amp;ssl=1 307w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a>The <a title=\"4P1L model improved\" href=\"http:\/\/www.bartola.co.uk\/valves\/2013\/09\/29\/4p1l-model-improved\/\">uTracer<\/a> is a fantastic tool clearly. Well done Ronald!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have a pair of Sylvania&#8217;s SX-201a which sound superb. My\u00a0preferred\u00a0ones for 01apreamps. I&#8217;m looking at revamping my 01a\u00a0line-stage\u00a0shortly. Here is a trace of the anode curves for one of them: The uTracer is a fantastic tool clearly. Well done Ronald! &nbsp;<\/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_feature_clip_id":0,"_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":[5],"tags":[10,429,447,25,446,428],"class_list":["post-2007","post","type-post","status-publish","format-standard","hentry","category-valves","tag-01a","tag-curve-tracer-2","tag-sx-201a","tag-tube-curve-tracer","tag-tube-tracer","tag-utracer"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-wn","jetpack_likes_enabled":true,"jetpack-related-posts":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/2007","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=2007"}],"version-history":[{"count":1,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/2007\/revisions"}],"predecessor-version":[{"id":2009,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/2007\/revisions\/2009"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=2007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=2007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=2007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}