CurtPalme.com Home Theater Forum

[kal]

I obtained a supposedly minty P16LNP47HKA (8" GREEN LC) tube here that has some odd marks on it that I figured were deflection/spot burns on it. They are obvious to the naked eye but hard to photograph. What do you guys think caused this?:









It's really hard to photograph. They're much more obvious in person under any light. Assume they're about two three times dark than what you see here. I noticed them immediately.

Looking at the photos it’s not the darker shadows from dust spots and other things in the glycol or on the outside tube surface. Those are normal and expected to some degree. It’s the lighter colored horizontal lines and the light pin-prick dot groupings at are in the same plane as the stippled phosphor.

There’s one grouping of horizontal lines near the middle of the tube, and two groupings of dots in arcs below the lines.

The rest of the phosphor is pristine.

These imperfections are for sure in the phosphor: They do not cast shadows or move at all when you shine a bright light at various angles (they don’t cast shadows like some of the other small bits). The groupings of the lines and dots also made me think that the it's defection/spot burns as the beam stops/moves due to failing H/V deflection circuitry.

The rest of the phosphor being pristine makes me think this tube only had a few hours on it (if even that) before the deflection circuitry failed.

Thoughts?

Kal

[kal]

I obtained a supposedly minty P16LNP47HKA (8" GREEN LC) tube here that has some odd marks on it that I figured were deflection/spot burns on it. They are obvious to the naked eye but hard to photograph. What do you guys think caused this?:









It's really hard to photograph. They're much more obvious in person under any light. Assume they're about two three times dark than what you see here. I noticed them immediately.

Looking at the photos it’s not the darker shadows from dust spots and other things in the glycol or on the outside tube surface. Those are normal and expected to some degree. It’s the lighter colored horizontal lines and the light pin-prick dot groupings at are in the same plane as the stippled phosphor.

There’s one grouping of horizontal lines near the middle of the tube, and two groupings of dots in arcs below the lines.

The rest of the phosphor is pristine.

These imperfections are for sure in the phosphor: They do not cast shadows or move at all when you shine a bright light at various angles (they don’t cast shadows like some of the other small bits). The groupings of the lines and dots also made me think that the it's defection/spot burns as the beam stops/moves due to failing H/V deflection circuitry.

The rest of the phosphor being pristine makes me think this tube only had a few hours on it (if even that) before the deflection circuitry failed.

Thoughts?

Kal

[Curt Palme]

Looks like a starburst sorta, right?

Text wear, I got some 909s here from a planetarium last year with a similar wear pattern.

[Curt Palme]

Looks like a starburst sorta, right?

Text wear, I got some 909s here from a planetarium last year with a similar wear pattern.

[Clarence]

increased the contrast...

[kal]

Hi Clarence: Yes - that's what I wanted to show... the horizontal lines and dots. Your picture is a clearer indication of what the tube actually looks like in person.

Above the horizontal lines at about 10 and 2 o'clock positio are a bunch of double/triple dots in arcing patterns. The fact that they're arc'ing made me assume was spot burn as the deflection failed: the beam would stutter/stop/start and cause burn. But I'm not sure anymore.

This is a backup tube I obtained.

I don't think I can use it as I really don't see how these defects wouldn't show up on screen in an obvious manner. They're obvious on the tube face (the photos make them look more subdued). If you can see something on the tube face it always shows up 10x worse on screen. If I had a backup machine to throw the tube in I'd do it but as such the only way to test this tube is many hours of work in replacing my current green tube with this one.

Kal

[kal]

Hi Clarence: Yes - that's what I wanted to show... the horizontal lines and dots. Your picture is a clearer indication of what the tube actually looks like in person.

Above the horizontal lines at about 10 and 2 o'clock positio are a bunch of double/triple dots in arcing patterns. The fact that they're arc'ing made me assume was spot burn as the deflection failed: the beam would stutter/stop/start and cause burn. But I'm not sure anymore.

This is a backup tube I obtained.

I don't think I can use it as I really don't see how these defects wouldn't show up on screen in an obvious manner. They're obvious on the tube face (the photos make them look more subdued). If you can see something on the tube face it always shows up 10x worse on screen. If I had a backup machine to throw the tube in I'd do it but as such the only way to test this tube is many hours of work in replacing my current green tube with this one.

Kal

[LOTREE]

I'm not sure what those pic's look like on an LCD but I could see them fine here on thee old CRT monitor but thanks Clarence for the arrows.

Interesting you point those out as I noticed a similar burn on a tube from the Barco Vision II tube I took apart today due to fungus. It was only one line off to the side about 1cm long though.

That sucks the tube is in the condition it is Kal. A good deal on it at the time, I considered getting it myself. Bummer

[kal]

So given that the marks are indeed in the phosphor and that in person they look about as dark as Clarence's photos, I'm presuming that the marks would definitely show up on the screen right? I don't see how they could not ...

Kal

[kal]

So given that the marks are indeed in the phosphor and that in person they look about as dark as Clarence's photos, I'm presuming that the marks would definitely show up on the screen right? I don't see how they could not ...

Kal

[Chuchuf]

The dots look like flecks or spots of phosphor that have delaminated from the mask, and if that's what they are the tubes are junk as it will show up as spots on the screen.
They are junk, return to seller for a refund.

Terry

[secstate]

I have never seen anything like that but if it is in the phosphor they for sure would show up on-screen. I had a VDC tube have a "pin prick" bit of phosphor missing you could hardly see it on the tube but it gave you a quarter sized dot on the screen so if Terry is right about the delamination then that tube would look awful. I'd return for a refund at this point.

[kal]

Thanks guys!

That's what I figured. Just wanted to confirm before I even consider spending time trying the tube out. I wanted to give the seller the benefit of the doubt but I don't see at all how trying out the tube would not be anything but a waste of time and effort.

My current green tube has a tiny bit of wear. This one was simply going to be a backup that I'd install a few years down the road so I'm in no hurry to take the machine apart.

Kal

[kal]

Thanks guys!

That's what I figured. Just wanted to confirm before I even consider spending time trying the tube out. I wanted to give the seller the benefit of the doubt but I don't see at all how trying out the tube would not be anything but a waste of time and effort.

My current green tube has a tiny bit of wear. This one was simply going to be a backup that I'd install a few years down the road so I'm in no hurry to take the machine apart.

Kal

[Chuchuf]

Let me guess who you got this junk from..........

Terry

[WTS]

Well don't be shy Terry, tell us so no one else buys from the same seller, or I suppose Kal could tell us.

[secstate]

[kal]

It was purchased from cmjohnson. See: https://www.curtpalme.com/forum_archived/viewtopic.php@t=20780.html

Chris offered to refund me. We'll see what happens.

While I'm typically very flexible with sales of anything used I really don't see any other choice then a refund as the tube's obviously not pristine as was stated. It is unusable. The dots/lines are seen immediately upon looking at tube face.

Kal

[kal]

It was purchased from cmjohnson. See: https://www.curtpalme.com/forum_archived/viewtopic.php@t=20780.html

Chris offered to refund me. We'll see what happens.

While I'm typically very flexible with sales of anything used I really don't see any other choice then a refund as the tube's obviously not pristine as was stated. It is unusable. The dots/lines are seen immediately upon looking at tube face.

Kal

[Chuchuf]

He knows better than to sell this kind of junk.......there is no excuse.
GL getting your money back Kal

Terry

[kal]

Chris has offered to refund my money on Thursday. An unfortunate sale.

Kal

[kal]

Chris has offered to refund my money on Thursday. An unfortunate sale.

Kal

[WTS]

BS! He should have never been selling that junk in the first place, let alone try selling it on this site where we're all suppose to be friends so to speak.

[Spanky Ham]

Walter,
You may be right, but I have seen other people sell and push crap on here as well. At least he is refunding the money.


I might also mention that CJ has actually contributed to the forum, as opposed to those that have come here to sell their stuff or those that ask for help in repairing their pj just to sell. I can think of two that fit that latter description immediately. I don't mean to sound like CJ's lawyer, but the other people get my panties in a wad before this.

[Chuchuf]

[Chuchuf]

[Spanky Ham]