{"id":10137,"date":"2019-06-10T16:54:25","date_gmt":"2019-06-10T20:54:25","guid":{"rendered":"http:\/\/www.engineeringradio.us\/blog\/?p=10137"},"modified":"2023-03-19T09:08:22","modified_gmt":"2023-03-19T13:08:22","slug":"almost-eighteen-years","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2019\/06\/almost-eighteen-years\/","title":{"rendered":"Almost Eighteen Years"},"content":{"rendered":"

I do not know what the record is for the longest tube life, however, this particular tube lasted 17 years, 11 months, and 23 days.\u00a0 That’s 157,596 hours.<\/p>\n

I had written about this almost five years ago: https:\/\/www.engineeringradio.us\/blog\/2014\/12\/longest-tube-life\/<\/a><\/p>\n

The last one was last fall: https:\/\/www.engineeringradio.us\/blog\/2018\/09\/i-almost-hate-to-say-anything-but\/<\/a><\/p>\n

\"\"<\/a>
Eimac 4CX12000A power tube, serial number RHH108<\/figcaption><\/figure>\n

This was installed new in a Broadcast Electronics FM20T transmitter which was placed online on June 6, 2001.\u00a0 It lasted until May 28th, 2019 with almost no downtime.\u00a0 Towards the end, the emissions started dropping off and we increased the filament voltage up to 10 volts.\u00a0 When you have to increase the filament voltage, that really is the end for a tube.<\/p>\n

The new tube was put in and I carefully marked out the date in the maintenance log.\u00a0 The hour meter on the transmitter stopped working several years ago.<\/p>\n

Prior to this, the longest tube life I’d experienced was an EEV 4CX35000C from an MW-50B transmitter RF section.\u00a0 When that tube came out, it looked like it have been on fire.<\/p>\n","protected":false},"excerpt":{"rendered":"

I do not know what the record is for the longest tube life, however, this particular tube lasted 17 years, 11 months, and 23 days.\u00a0 That’s 157,596 hours. I had written about this almost five years ago: https:\/\/www.engineeringradio.us\/blog\/2014\/12\/longest-tube-life\/ The last one was last fall: https:\/\/www.engineeringradio.us\/blog\/2018\/09\/i-almost-hate-to-say-anything-but\/ This was installed new in a Broadcast Electronics FM20T transmitter … Continue reading Almost Eighteen Years<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":10147,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[82,15],"class_list":["post-10137","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-fm","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/comments?post=10137"}],"version-history":[{"count":6,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10137\/revisions"}],"predecessor-version":[{"id":11073,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/10137\/revisions\/11073"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/10147"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=10137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=10137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=10137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}