Admiral Combo Chassis - Dead LV Rectifier?

[N2IXK]

Is it the 5U4 or the 6X5 that isn't lighting? Do the rest of the tubes light?

If the tube tests OK, then you either have a bad tube socket, or an open rectifier filament winding on the power transformer (very unusual). If none of the other tubes are lighting, check the power cord, power switch, line fuse, and power transformer primary.

[Nuke]

I think it is the socket. Tube feels loose in there but I would think if I wiggled it it would make some sort of contact. I will try to shim it somehow.

[Nuke]

Actually now I am not sure this is a socket. Some other tubes don't look like they are lighting. I'm wondering if I have a bad resistor somewhere in the circuit?