I have subject tubes with serial numbers E0-09528, I9-29374, and I9-27406. Can anyone tell me what year they were manufactured? Thanks! Mark Fancher, AA4MF mmfancher@earthlink.net -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com