Dave:
CTR Surplus usually has a big supply of MRI/CT pulls of various date codes. He guarantees that they are good. Has some on Ebay right now.
See the following link:
http://cgi.ebay.com/Used-Eimac-3CPX800A7-Tube-Date-Code-Year-2002-Triode_W0QQitemZ290082090143QQihZ019QQcategoryZ48710QQcmdZViewItem
73, Dennis W0JX/8