<div dir="ltr"><table width="100%" border="0" cellspacing="0" cellpadding="0" style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:medium"><tbody style="box-sizing:border-box"><tr style="box-sizing:border-box"><td style="box-sizing:border-box"><div id="gmail-story" style="box-sizing:border-box;width:618.4px;font-size:16px;height:auto;float:left"><h1 style="box-sizing:border-box;font-size:16pt"><div><img src="cid:ii_khm0lrae1" alt="image.png" width="651" height="433" style="margin-right: 0px;"><br></div></h1><h1 style="box-sizing:border-box;font-size:16pt">IEEE: The 11 Greatest Vacuum Tubes You’ve Never Heard Of</h1><p style="box-sizing:border-box">A <strong style="box-sizing:border-box">IEEE Spectrum</strong> magazine article says for richness, drama, and sheer brilliance, few technological timelines can match the 116-year (and counting) history of the vacuum tube<br style="box-sizing:border-box"><br style="box-sizing:border-box">To prove it, they&#39;ve assembled a list of vacuum devices that over the past 60 or 70 years inarguably changed the world. These include the Ubitron, Carcinotron and Coaxitron.<br style="box-sizing:border-box"><br style="box-sizing:border-box">Read the article at<br style="box-sizing:border-box"><a href="https://spectrum.ieee.org/tech-history/space-age/the-11-greatest-vacuum-tubes-youve-never-heard-of" target="_blank" style="box-sizing:border-box;color:rgb(0,51,102);text-decoration-line:none">https://spectrum.ieee.org/tech-history/space-age/the-11-greatest-vacuum-tubes-youve-never-heard-of</a></p></div></td></tr></tbody></table></div>