The Family DuMont

[old_coot88]

I dunno. Considering the heirloom status of the TV, and unless the CRT is absolutely and equivocally proven weak and needing a brightener, i wouldn't do it. The pics Cary has posted of the CRT's display sure don't look like a weak CRT.
Symptoms of weak emission would include (from a cold start): coming on very dim with a 'silvery' or negative look, then gradually building up over several minutes to a brighter pic.