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Tim,
I have replaced the selenium rectifiers with diodes, no dropping resistors needed. I restored a CBS RX90 which subsequently developed an arc over from the filament winding of the HV rectifier to the flyback core, so now when I restore a set I replace the filament wires out of paranoia. I use that very flexible silicone wire rated at 20KV or better. I can send you some if you need it.
I would recommend adding fusing downstream of the purity control and the field neutralizing control. I have had more than one set develop a B+ fault which burned up one or both of these hard to find pots. I just seem to be unlucky.
Good luck!
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John Folsom
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