[clockman1954]

OK, so would it be possible that someone didn't have the correct tube and installed the large 5Z3 with a potentiometer to regulate it? As you can tell, I have no electrical or tube radio knowledge, so I may be asking the equivalent of "the kneebone's connected to the...."! As you noted, the red wire may be new, but there is a second wire going to the top of that cap that is disconnected; should it be attached?

I'm not going to fire it up; I have a tube radio repairman nearby who has my Philo 48-1270 chassis now, so I'll wait for him.

I see there is an internal plug as well. Does that allow one to disconnect the radio and use the clock?