I have a feeling that some of those tubes you bought are not too good. OR, you have some really dirty tube sockets. Bouncing the set made me think of these things. If I were you, Id resolder any PC ground points, and anything else around the tube sockets that looks dull, or you see cracks in the solder. Any chance that you adjusted the AGC control a bit too much?
You really need access to a good tube tester. One that can really work the tubes in question. At the least, your set has all its deflection and HV circuits working. Thats one BIG problem in most of the old sets I see.
Have you messed with the tubes in the tuner at all? If nothing else, try reinstalling the original tubes, except for the damper, and the other one that you found bad. Even original weak tubes are sometimes better than ebay junk. People will sell anything there, and tell you that they have tested everything, etc, and still lie to your face. These are in the minority, but they are there. I, on the other hand, have only had one bad ebay experience. The seller sold me a load of tubes that tested good on his checker, and mine, but in the circuit, they were microphonic-- tap the tube and hear it 'tinging' in the speaker! Wouldn't take them back.
One other thing, dont adjust controls that you dont understand. Your set will work again, but you gotta go easy on her. You are so lucky to have that style set.
Any chance the normal/service switch is in the service position?