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Well first of all it isn't a sure thing that I got it right, its a idea.
You have to understand how vacuum tubes work.
The rest is reading schematics and knowing how resistors and capacitors work in circuits. Recognizing sections of circuits I've seen before, etc.
There are some good vintage books available for free download on the web.
RCA tube handbooks have a section explaining a bit about how tubes work and for a more detailed explanation is in books like "Radiotron Designer's Handbook" also available.
Actually it seems to me that the way that C2 is connected it may make the problem worse. It may have been connected the way it is so as to reduce C2's needed voltage rating.
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