In IPC classes it is stressed never to solder to both sides of a barrel, since one side is then capped off with no way for air to flow out, which can create a gap to entrap fluids. I have been asked why soldering a resistor in a tip jack, such as cal parts, would be any different since there is no way for air to escape out the bottom of the tip jack. Or soldering a wire into a cup terminal? Can you answer this question for us. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------