Adam Sampson's capacitor bookmarkshttps://bookmarks.offog.org/ats/capacitorAdam Sampson2016-06-21T16:36:08ZPY1AHD ALEX - Alexandre Grimberg - py1ahdhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.alexloop.com%2Fartigo36.html2016-06-21T16:36:08ZA magnetic loop antenna with a highly entertaining tuning capacitor construction.Capacitor ESR Testerhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.members.shaw.ca%2Fswstuff%2Fesrmeter.html2010-05-21T14:08:53ZSimpler than most designs I've seen.Jackson Brothers - Variable Capacitors and Driveshttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.mainlinegroup.co.uk%2Fjacksonbrothers%2Findex.htm2009-12-18T11:22:32ZMakers of fine radio components since the 1920s. Still in business (even making many of the same designs), and selling stuff on eBay through Mainline Electronics!