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Look at the tubes with vert. labeled next to them in the set's tube chart and the vertical output transformer.....All caps connected even through resistors should be changed. There will be a lytic connected to the cathode of the vert output (most likely the problem) and one filtering the B+ connection of the output transformer, change them.
In a monochrome TV you need to know the generic block diagram of circuits that applies to any monochrome TV....Most apparent problems are easily correlated to their given 1-3 (most can be tracked to only 1) circuits, then it becomes a matter of replacing parts in that circuit. You should know this, and not need us to tell you, if you plan to service TVs.
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