As a courtesy,Thought I would answer your question regards tube shots. I have seen wear on crt`s with only 300ish hours if they have had a computer signal through them.(Normally the green.). It is not unusual for a green tube to show a little wear after 1,000hrs IF the input -or one of the inputs has been p.c. To my mind,the hours can be a nonsense,for example you can have a high hour crt that has been re-tubed that puts up a better pic than a low hour original.Though I tend to prefer low hour originals with great tubes. Also,there could have been situations where the hours have been altered for whatever reason.This is why its key to look at the tubes. The history is also important to make sense of the hours,how its been used etc. The difficulty comes with photos of tube shots,sometimes you can only see wear under certain light conditions,but the reality Is If you cannot see any wear on a whitescreen you are not going to see it in your picture. But If its a second hand crt of course there is wear -maybe not apparent -but there all the same. The crt ratings are Intended as a guide & I have found using this criteria any wear 8 and over will not show up on a whitescreen-so whether a crt tube is an 8,8.5 or a 9 there is little -If any noticable difference on a whitescreen & little point in arguing the toss about whether It is an 8 or 9. Either is good enough and the determination of whether It is an 8/9 subjective. An Important factor Is that the wear is spread even across the tube faces. I think history Is very important to know with a crt purchase,How Its been used in the past? Was It used for 16:9? p.c.? Knowing the history and asking the right questions allows you to build up a picture of what the crt could be like,what the tubes could be like. Most crt`s I have seen out of computer companies in the past have taken a battering on the green. Red tubes always seem o.k. Blue tends to take a hit If the crt has been used for video.