Hi Peter, The "Bulbous Solder Connection", or sometimes more irreverently referred to as "Pregnant Guppy Solder Joints," were an attempt to create reliable solder connections for leadless ceramic chip carriers in the Air Force Mantech program run by Martin-Marietta. Harvey Salomon of GE did some of the reliability testing. This part of the program failed as Mel indicated. Werner Engelmaier --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------