The red wire in your hand looks like its the HV lead to the CRT. Its
pulled out of the white plastic HV "cup".
Probably broke off the HV rectifier socket. You will need to take apart
the HV cup to see.
Interesting to see the US$$ v Can $$ in the ad. The color set would be $300
& your B&W abt $140 US$.
73 Zeno
LFOD !