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Yes, three rectifiers and seven electrolytics if I'm counting right. My National TV-7W has something similar, with a 25Z6 identified as a rectifier/voltage doubler and 6X5GT as a voltage tripler. Maybe something like that is going on here, although I haven't looked closely at either schematic.
A 6X5 rectifier is notorious in radio circles for developing a heater to cathode short. Various remedies are used, from installing a fuse to replacing it entirely. An Internet search may uncover some of those discussions. Perhaps the risk is negligible in a series string set, which has no power transformer to fry.
I'm a fan of the CL-90 ever since I put one in an RCA color set. Cheap and effective, just understand that it may get hot.
When I did my 505, I probably would have replaced the selenium rectifier with a 1N4007 diode and not changed anything else. Some people add more resistance in series with the new diode.
Phil
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