Hi all, I purchased a pair of brand new Eimac 8877 tubes. The tubes are labled with indication: "YU-158". I there any difference? 73, Werner DJ2HZ / VE7HBI -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm