{"id":12585,"date":"2017-11-19T22:15:58","date_gmt":"2017-11-20T06:15:58","guid":{"rendered":"https:\/\/rustybolt.info\/wordpress\/?p=12585"},"modified":"2017-11-25T22:24:58","modified_gmt":"2017-11-26T06:24:58","slug":"2017-11-19-royal-500-pcb-hairline-crack","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=12585","title":{"rendered":"2017-11-19 Royal 510 PCB hairline crack\u00a0"},"content":{"rendered":"

For FB group Vintage Transistor Radios <\/p>\n

Speaking of fuzzy garbled audio…  I won another auction for a Zenith “Royal 510” which I’d never heard of.  It turned out to be a Royal 250.  The seller got no bids at all, so with less than a minute left I bid the minimum ten dollars.<\/p>\n

I got it this afternoon.  It needed the usual capacitors, but after I got done doing those, it was microphonic, any vibration from the speaker would set it off into a squawk or buzz.  I started poking around to find a loose solder joint, and I finally found one and fixed it.  But it still squawked.  I had to poke around and flex the PC board quite a bit before I narrowed down the point that was causing the problem.  It was a hairline crack in the PCB trace, least where one would expect, in the middle of a trace thickly covered with heavy coat of solder.  I bridged the crack with two heavy wires imbedded in the thick solder.  I don’t think it will break again.  I guess the PC board was flexing when it was being shipped, and finally the trace cracked.  The board itself looks okay.<\/p>\n

I put it back together and Humpty Dumpty is working okay.  In the center of this photo is a ‘dogbone’ shaped piece of solder with the almost invisible hairline crack in the middle.<\/p>\n

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

For FB group Vintage Transistor Radios  Speaking of fuzzy garbled audio…  I won another auction for a Zenith “Royal 510” which I’d never heard of.  It turned out to be a Royal 250.  The seller got no bids at all, so with less than a minute left I bid the minimum ten dollars. I got <\/p>\n

(Read More…)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[311,7,262,335,206],"tags":[],"class_list":["post-12585","post","type-post","status-publish","format-standard","hentry","category-am-band","category-radio-frequency","category-receiver","category-repair-alignment","category-toroids-and-cores"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12585"}],"version-history":[{"count":4,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12585\/revisions"}],"predecessor-version":[{"id":12599,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/12585\/revisions\/12599"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}