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I see a quite similar Sylvania in Beitman's 1952 Most needed TV book. Page 177. Digital copies exist on various places on the 'net. I see a few strange things, like the power supply has a -135V and another supply at +125V. Some circuits like the vertical and horiz use both, ie, their cathodes draw electrons from the -135V supply and the plates draw current from the +125V (remember, current flow is in the opposite direction of the flow of electrons, blame Ben Franklin for getting it backwards). Some low power circuits draw only from one or the other. And become effectively in series. So some of those electrolytic cap outside cans may be at some high voltage compared to the chassis, maybe even that hack masking tape one. I see an added electrolytic cap as well.
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