{"id":4611,"date":"2015-05-09T21:11:29","date_gmt":"2015-05-09T20:11:29","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=4611"},"modified":"2015-05-09T21:14:49","modified_gmt":"2015-05-09T20:14:49","slug":"sic-cathode-bias","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2015\/05\/09\/sic-cathode-bias\/","title":{"rendered":"SiC cathode bias"},"content":{"rendered":"<p>Playing this afternoon with the SiC\u00a0<a href=\"http:\/\/www.cree.com\/~\/media\/Files\/Cree\/Power\/Data%20Sheets\/C3D02060F.pdf\">C3D02060F<\/a>, which can happily run +20mA with very low dynamic resistance. Ideal for the 6e5p\/6e6p driver I had in mind for the 300B amp:<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"4612\" data-permalink=\"https:\/\/www.bartola.co.uk\/valves\/2015\/05\/09\/sic-cathode-bias\/c3d02060f-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png?fit=1128%2C1607&amp;ssl=1\" data-orig-size=\"1128,1607\" 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=\"C3D02060F-1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png?fit=719%2C1024&amp;ssl=1\" class=\"alignleft wp-image-4612 size-large\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1-719x1024.png?resize=584%2C832\" alt=\"C3D02060F-1\" width=\"584\" height=\"832\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png?resize=719%2C1024&amp;ssl=1 719w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png?resize=211%2C300&amp;ssl=1 211w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-1.png?w=1128&amp;ssl=1 1128w\" sizes=\"auto, (max-width: 584px) 85vw, 584px\" \/><\/a>At 20mA of cathode current the forward voltage is 0.85V and dynamic resistance 1.5\u03a9. If cathode current is 40mA instead the resistance drops down to 1\u03a9:<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"4613\" data-permalink=\"https:\/\/www.bartola.co.uk\/valves\/2015\/05\/09\/sic-cathode-bias\/c3d02060f-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png?fit=1128%2C1607&amp;ssl=1\" data-orig-size=\"1128,1607\" 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=\"C3D02060F-2\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png?fit=719%2C1024&amp;ssl=1\" class=\"alignleft wp-image-4613 size-large\" src=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2-719x1024.png?resize=584%2C832\" alt=\"C3D02060F-2\" width=\"584\" height=\"832\" srcset=\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png?resize=719%2C1024&amp;ssl=1 719w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png?resize=211%2C300&amp;ssl=1 211w, https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2015\/05\/C3D02060F-2.png?w=1128&amp;ssl=1 1128w\" sizes=\"auto, (max-width: 584px) 85vw, 584px\" \/><\/a>The 6e5P\/6e6P will run comfortably around 30-40mA and bias tends to be around 3.5-3.7V to swing nice volts as needed. Therefore, we will need 4 SiC in series. 4\u03a9 resistance is good enough and not adding much when reflected to the anode&#8230;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Playing this afternoon with the SiC\u00a0C3D02060F, which can happily run +20mA with very low dynamic resistance. Ideal for the 6e5p\/6e6p driver I had in mind for the 300B amp: At 20mA of cathode current the forward voltage is 0.85V and dynamic resistance 1.5\u03a9. If cathode current is 40mA instead the resistance drops down to 1\u03a9: &hellip; <a href=\"https:\/\/www.bartola.co.uk\/valves\/2015\/05\/09\/sic-cathode-bias\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;SiC cathode bias&#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_post_was_ever_published":false,"_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}},"categories":[5],"tags":[29,347,606,746,750,749],"class_list":["post-4611","post","type-post","status-publish","format-standard","hentry","category-valves","tag-6e5p","tag-6e5p-driver","tag-6e6p","tag-cree-c3d02060f-bias","tag-sic","tag-sic-cathode-bias"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1cn","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4611","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=4611"}],"version-history":[{"count":5,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4611\/revisions"}],"predecessor-version":[{"id":4618,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4611\/revisions\/4618"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=4611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=4611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=4611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}