I like the picture on that set too. Are those two pictures from OTA signals or cable? If OTA, you must be in a good area for reception from the two Salisbury network stations (channels 16 and 47), not counting the several PBS stations you can receive from Delaware and elsewhere in that area.
When I saw that your set uses two 3DG4 low-voltage rectifiers, it reminded me of my Zenith K2739 1963 23-inch console b&w TV (now long gone after 41 years). My set also used a 3DG4 as an LV rectifier and had fins on the power transformer (yours doesn't seem to). I note this because the 3DG4 seems like an oddball tube that would be difficult to find a replacement for if it burned out or (gasp!
) shorted, to say nothing of the fact that most TVs of that era used one or two 5U4s or 5Y3s as LV rectifiers. I think Zenith may have been the only TV manufacturer that used a 3DG4 in that position in the set.
Do color sets of the '60s draw that much more current than newer sets that they require two LV rectifiers? Yours is one of the few sets (color or b&w) I've seen in all my years of electronics experimenting that uses two low-voltage rectifiers, in addition to the HV rectifier.