Also check ham flea markets & ask around. I bet in the 70's
there were at least 30 shops in your city & lots of Eq to find.
Recommend either a B&K or Sencore from the 70's on.
Be sure it has a lot of sockets, set up book & owners manual.
With a universal adapter you can test damn near any CRT.
BTW if the sets run you can tell if a CRT is good by the symptoms & voltage measurements.
73 Zeno
LFOD !