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Got 3 .0047uF 600V caps?...If so and you wire them in series you'll get 1 .00156666uF 1800V cap...I used to do that from time to time before I started stocking 1600V caps. Caps in series (assuming all are the same value) the new capacitance is the face value divided by the number in series, and the rated voltage adds.
Caps in parallel the capacitance adds, and the voltage is that of the lowest rated part.
If C13 really has a .1 in parallel with it then it is a .133 cap. That may have been done to get a really precise value and or compensate for adapting an NTSC design to CCIR.
You don't want to monkey with sweep cap values unless it won't run on frequency with all the right parts...I know from experience it can be a messy proposition to deal with fudged values.
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