It's missing the 1B3 socket and Doorknob cap, (and all the other tubes of course) I'm pretty sure this does have a separate PS.
What about the knobs? don't see those anywhere.
It looks like the same basic chassis used in the 10" Mayflower Porthole and that set uses a separate power supply, you need a picture of the back apron to see if there's a socket for the PS to plug into, it probably has a "Phonevision" jack also.
Rear view of a Mayflower, note the two sockets lower right side (viewed from rear).
http://www.radiomuseum.org/r/zenith_...r_28t925r.html