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Yes that is called a ballast tube, often made by Amperite. Some of them have taps for pilot lamps.
Calculate the resistance and power rating from subtracting the sum of all the heater voltages from the power line and dividing by 0.3 Amperes. If you need 68 Volts from 120 V, then you divide 52V by 0.3A and get about 170 Ohms. It will dissipate about 16W so use a 30 W resistor or thereabouts and mount it clear of components that its heat will damage.
Having said that, you may still be able to find ballast tubes, assuming yours is bad. Measure across various pins to see if you can measure somewhere around 150-170 Ohms. If so, it's probably good.
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