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Generally the cap across the power line develops leakage or shorts and it can just explode causing the black soot deposits, if there's a capacitor across the power cord now that's not exploded it's probably a replacement. The rectifier would not keep the tubes from lighting up. Your set uses a series string of tubes ie the filaments are in series, if one of them burns out none of the tubes will light up. If you don't have a tube tester you can check the filaments with an ohm meter, on the 7 pin miniatures that are in you set the filaments are connected to pins 3 and 4. Looking at the tube from the bottom count clockwise starting from the pin on the left side of the missing pin and go clockwise to number the pins.
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