What made vintage old tv dangerous to turn on

[Acabal1234]

My Name is art. im new to the site. what made old tv dangerous to turn on. As a kid i remember the tvs were always smelling like burnt and smoke billowing from the top. that was nerv wreking as a kid to see lol.

if one restores a vintage tv is there a new way of upgrading the electronics so that they dont depend on bulbs or some of the paper transistors?