Probably don't need to replace all the tubes. Might want to post your TV questions here, under TV:
http://www.antiqueradios.com/cgi-bin/forums/index.cgi
Norm
:Hi im needing a clear wire diagram for a motorola 9t1 I do belive it is.. needing to replace all the tubes and caps but few are marked..and im concerned about replacing the wrong ones.thanks