{"id":3036,"date":"2021-10-02T11:08:00","date_gmt":"2021-10-02T01:08:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2021\/10\/02\/selenium-rectified\/"},"modified":"2025-07-22T18:04:32","modified_gmt":"2025-07-22T08:04:32","slug":"selenium-rectified","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2021\/10\/02\/selenium-rectified\/","title":{"rendered":"Selenium RECTIFIED"},"content":{"rendered":"<\/p>\n
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Selenium rectifiers. The name kind of sounds like Dilithium crystals, possibly related to flux capacitors. <\/b><\/p>\n

Anyway, there were two of them in the Globe Electronics V-10 VFO Deluxe that I recently bought. Obviously they had to go, so I took them out yesterday, replacing them with a 1N5408 silicon rectifier. <\/b><\/p>\n

The new diode had a significantly lower voltage drop than the selenium rectifiers — this pushed the output voltage from the power supply up to around 200V. It is supposed to be around 185 V. So I put a 470 ohm, 5 watt resistor (found in the junkbox) in series. This brought the output voltage to 167 V. Close enough. VFO seems to be working fine. <\/b><\/p>\n

I’m glad I did the extraction before these aging components released their nasty toxic smoke. <\/b><\/p>\n

W3HWJ has a good article on replacing these nasty old parts, with some interesting info on their history: <\/b>http:\/\/www.w3hwj.com\/index_files\/RBSelenium2.pdf<\/b><\/a><\/p>\n

Backgound on the element Selenium: https:\/\/en.wikipedia.org\/wiki\/Selenium<\/a><\/b><\/p>\n

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Selenium rectifiers. The name kind of sounds like Dilithium crystals, possibly related to flux capacitors. Anyway, there were two of them in the Globe Electronics V-10 VFO Deluxe that I recently bought. Obviously they had to go, so I took them out yesterday, replacing them with a 1N5408 silicon rectifier. The new diode had a … Continue reading “Selenium RECTIFIED”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":3037,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,101,53],"tags":[],"class_list":["post-3036","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-radio-history","category-tubes","category-vfo"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3036","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=3036"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3036\/revisions"}],"predecessor-version":[{"id":3039,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3036\/revisions\/3039"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/3037"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=3036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=3036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=3036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}