What is this?

[miniman82]

jr: The pattern is not exactly the same, the colored splotches move depending on which gun you turn on but the pattern is more or less the same. A red splotch becomes green, or a blue beomes red, ect. I know what you mean about the mask being out of alignment, but I've never heard of that before. I have not tried tapping the screen to see if they move, I'm hesitant because of implosion risks.

waise: Good question. The tube looks identical in every way to my CYP though, including the gun alignment. I'll try degaussing the neck tonight, though that will probably involve removing hte CRT to avoid demagnetizing anything else. I don't think it's the yoke, it seems to work as advertised.

Eric: The mods involve moving the red cathode to the same lug as green/blue, and a slight change to the chroma circuit (adding a resistor and ceramic cap to the G-Y amp). It has to do with the FJP sulphide tube having a more efficient phosphor than the CYP tube does. The literature also mentions adding a red screen control if balance cannot be achieved, but obviously I haven't been able to get that far just yet. Haven't tried removing the convergence yoke yet, I'll try tonight. I'm gonna hold off calling Scotty till I try a few things, I know he's pretty busy.

oldtvman: I know what you mean, but I trust that the tube was rebuilt correctly. Scotty did say that some of the phosphor on the screen had flaked off in a previous rebuild attempt, but it's not really noticable. With the set off, you can actually see a few spots where it's missing dots, but with it on it's not really noticeable.



Here's a question: could this be a total loss of focus? I don't really trust the focus rect in this set, and I have a spare I could try. My guess is that the screen would just be really fuzzy if that happened, and I wouldn't see much of anything at all. Just a blur.

[jr_tech]

Originally Posted by miniman82

jr: The pattern is not exactly the same, the colored splotches move depending on which gun you turn on but the pattern is more or less the same. A red splotch becomes green, or a blue beomes red, ect. I know what you mean about the mask being out of alignment, but I've never heard of that before. I have not tried tapping the screen to see if they move, I'm hesitant because of implosion risks.

Here's a question: could this be a total loss of focus? I don't really trust the focus rect in this set, and I have a spare I could try. My guess is that the screen would just be really fuzzy if that happened, and I wouldn't see much of anything at all. Just a blur.

Sad to say, but everything that I have read here seems to be consistent with the shadow mask being totally out of position, not just bent or dimpled. Focus appears to be fine.

Does the box show any sign of damage? it would take a fairly severe bump to dislodge the shadow mask spring clips from the posts on the inside of the front panel. Anybody know how many clips are used in this roundie? ...3?

I suspect that the tube was fine when Scotty shipped it... I would guess that he tested red, blue and green fields to evaluate rebuild quality, and perhaps eliminate any screen contamination that might have occured during the rebuild process.

TubeTypes' test may well reveal a loose shadow mask assembly, but it is also possible that the mask could be wedged in its' present position... for sure worth a try!

sad ,
jr

[miniman82]

Originally Posted by jr_tech

Does the box show any sign of damage? it would take a fairly severe bump to dislodge the shadow mask spring clips from the posts on the inside of the front panel.

No, actually the box was perfect! I was half expecting to get a pile of crushed glass in the mail, but Hawkeye packs them very well. It was mailed with the face pointing down resting on a pile of foam, with a cardboard piece at the base of the bulb to keep it from shifting. There's basically no way for the neck to break, and I doubt it sustained any sort of shock in transit.

I'll try the box trick, but I'm not so sure I'll be able to 'nudge' the mask back into position if that is in fact what happened.