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You're are seeing a lot of crappy repair work that was done in the 50s-70s. They could do haphazard work and still get the TV to work OK. I've seen a lot of missing HV covers. Some repairmen just didn't put them back on, especially if they were difficult to re-install. Based on the voltages involved with B&W TVs, there wasn't that much of an X-ray hazard. The cage was mainly to contain the high voltages. It's also possible that the customer didn't want the TV repaired after the repairman gave them an estimate and the repairman just slapped it back into the cabinet, thinking that the TV would never be repaired.
Littlefuse made a fuse holder which allowed to you piggyback a new pigtail-less fuse onto a pigtail fuse. I used them some when I didn't have the exact value fuse in the pigtail configuration.
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