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Should that capacitor have the same capacitance as the original or just anyy capacitance.
Same as original is always best, but .05uF is a bit large for a ceramic type. You may need to go with a polystyrene film cap. Whichever you use, make sure it has the proper safety rating for across the line AC service.
This cap is used for RF bypass purposes, and isn't all that critical as far as capacitance value.