If a picture tube loses its vacuum...

[peverett]

This is off the subject, but what Tom Ryan mentions about materials different rates of expansion when heated is exactly why I do not like the radiators in new cars(The ones with the plactic ends and aluminum body). After both my 70s Mustang and early 1980s Pickup truck(both with brass radiators) went 20+ years without the radiators leaking, my wifes crappy aluminum/plastic radiators starts leaking after 5 years. What crap.