5tp4.. early proj tube

[wiseguy]

take a look below... looks "cooked".. hehe,this tube is on e-bay,
i wonder how many hours these things can last with moderate intensity,i replaced many sony CRT's in vph-12xxx series industrial projectors..( i use a VPH-1272 and a g70 for HDTV),but have never seen a crt this badly burned,i suppose they did not have any type of cooling back then..
it's just interesting though..
terry