{"id":6079,"date":"2016-12-17T13:19:42","date_gmt":"2016-12-17T13:19:42","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=6079"},"modified":"2016-12-17T13:19:42","modified_gmt":"2016-12-17T13:19:42","slug":"flexible-ht-power-supply-part-v","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2016\/12\/17\/flexible-ht-power-supply-part-v\/","title":{"rendered":"Flexible HT Power Supply (Part V)"},"content":{"rendered":"

I’m now back in business. Building a new 4P1L PSE output stage so will reuse the 300B\/4P1L Flexible PSU<\/a>.  I never managed to post an update on the troubleshooting I had to do to get this HT PSU to its optimal state. <\/p>\n

The output voltage was lower than expected and the 50Hz component extremely high. Something was wrong. So I traced the issue down. I found a bad solder in one of the rectifier’s cathode. The supply was operating in half-wave mode. <\/p>\n

The supply is choke-input with 6AU7 rectifiers (hybrid bridge with FRED rectifiers<\/a>). The transformer is custom made and has multi-taps for 300-400 and 500V. The tuning capacitor for the choke input is 470\u03bcF, then choke is 2.5H into 50uF oil cap. The filtering stage per channel is 20H + 100\u03bcF Oil caps;<\/p>\n

Here’s a test of the supply at 330V\/60mA per channel. It’s very rewarding now to see no 50Hz component and that the ripple at 100Hz is just 4mV (ignore the mA typo on the image):<\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

I’m now back in business. Building a new 4P1L PSE output stage so will reuse the 300B\/4P1L Flexible PSU.  I never managed to post an update on the troubleshooting I had to do to get this HT PSU to its optimal state.  The output voltage was lower than expected and the 50Hz component extremely high. … Continue reading “Flexible HT Power Supply (Part V)”<\/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":[673,835],"tags":[610,675,216,967,115,969,968],"class_list":["post-6079","post","type-post","status-publish","format-standard","hentry","category-300b-amp","category-4p1l-pse-amp","tag-300b","tag-300b-amp","tag-4p1l-pse","tag-4p1l-psu","tag-ht-supply","tag-tube-power-supply","tag-valve-rectifier"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1A3","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6079","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=6079"}],"version-history":[{"count":1,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6079\/revisions"}],"predecessor-version":[{"id":6082,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6079\/revisions\/6082"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=6079"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=6079"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=6079"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}