I have a few of these that need to be tested. I am certain they have not been plugged in for many years. Is the anything special I need to do before I just plug them in and turn them on? Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus