did my 1st cateract removal

[marty59]

Originally Posted by VintagePC

Indeed, good news.
Out of curiosity, what actually constitutes a cataract? Is it just delamination of the safety glass, or does the sealant actually "go bad"?

The "bonding material" between the tube and the safety glass is breaking down mostly due to age. Here's my patient:

[DaveWM]

I think the key to a low stress removal it like in the shaw shank redemption movie, time and pressure...

a concern is the effect of the intense direct sunlight on the phospors on the screen, I know its only going to be an hour or 2 but still...

I was thinking of placing a sheet of black tin foil on top of the screen during the warm up phase. The idea is to put it out in the sun early in the day and let it warm up over hours until high noon, then take off the covering so the fingers can be observed to be starting then recover. I know its prob not a big deal but I figure it cant hurt.

The warm up phase (start early) would allow the entire CRT to come up to temp to avoid distortion (the theorized reason for implosion on other attempts that used heat lamps and heat guns).

with a cover in place you could leave it under pressure for hours. The hard part would be to make a good contract with the glass.

I know it sounds like a lot of effort but with the scacity of these tubes (esp the roundies) I am just trying to take ever precaution possislbe. I would not even attempt it if the cat was mild, but that is not the case here.

[ctc17]

Originally Posted by marty59

The "bonding material" between the tube and the safety glass is breaking down mostly due to age. Here's my patient:

I have that EXact set and it has the green halo. That must be a RCA style replacement.

[marty59]

Originally Posted by ctc17

I have that EXact set and it has the green halo. That must be a RCA style replacement.

Actually, it is a Zenith branded, EIA 274 (RCA) coded tube with a very early 1964 (64-04) date code!