| Author |
Message |
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Tue Mar 18, 2008 12:15 pm Post subject: |
|
|
Well, in keeping with my conversation with myself here...I removed the burned tube from the 852 last night with not much difficulty. I really took my time and it was a little tense at the end as a bit more force than I expected was required to pull the bare tube from inside the yokes. I did my best to make good markings and measurements for the astig magnets and hope that I can get those back pretty close. Tonight I will remove my donor tube from the 110.
_________________
"Coffee is for Closers."
|
|
| Back to top |
|
 |
Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
|
| Posted: Wed Mar 19, 2008 12:31 am Post subject: |
|
|
I thought you were going to pull the tubes with all the magnetics in place and just plug and play ??
Why the change ? It makes it quite a bit more difficult to get the transplanted tube setup well....
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Wed Mar 19, 2008 12:01 pm Post subject: |
|
|
| Elaine Benes wrote: | I thought you were going to pull the tubes with all the magnetics in place and just plug and play ??
Why the change ? It makes it quite a bit more difficult to get the transplanted tube setup well.... |
Yeah, I talked myself out of that for some reason. I pulled the good tube last night. I think I have done a pretty good job of noting where everything was so hopefully I wont regret this whole thing.
Here are some pictures of the mess I have going on right now.
The XG852
The XG110
Green tube from each machine. Good one on the left. Bad one on the right.
I should have set up two sets of saw horses. Much easier than crawling around on the floor.
A few close ups of the burned green from the 852.
The donor tube from the 110.
|
|
| Back to top |
|
|
Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
|
| Posted: Wed Mar 19, 2008 12:55 pm Post subject: |
|
|
Yeah, but....
Where the magnetics were on the tube you pulled, have no bearing on where they go on the one you are installing...they're different tubes...
The general placement is the same between tubes, of course, but the exact position of the focus yoke and astig/flare magnets are only relevant to the particular tube they were installed on...
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Wed Mar 19, 2008 1:11 pm Post subject: |
|
|
| Elaine Benes wrote: | Yeah, but....
Where the magnetics were on the tube you pulled, have no bearing on where they go on the one you are installing...they're different tubes...
The general placement is the same between tubes, of course, but the exact position of the focus yoke and astig/flare magnets are only relevant to the particular tube they were installed on... |
Well, I guess the best I can hope for now is that I get the good tube back in the 852 without breaking it and then I will just have to struggle to get everything else right. That's the story of my life anyway. Never easy but then again, perhaps I brought this one on myself. My thinking was that I thought it might be better to keep everything intact and not introduce parts from one machine to another, other than the tube of course. I really studied the position of the magnetics and hardware on both green tubes from both machines and oddly enough they were almost exactly the same regarding position, placement, etc. I can only hope that I get things back correctly at some point. Who knows, maybe I will get lucky.
|
|
| Back to top |
|
|
MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
|
| Posted: Wed Mar 19, 2008 4:47 pm Post subject: |
|
|
I don't think you will have that that hard of a time getting the magnetics focus right, it just takes time...Mine were way off and I had a virgin projector. I now have way better overall focus. I would make sure you have your raster area small when adjusting as it will move all over the face of the tube while you are adjusting the rings, and you don't want it to go past the edges. 
I don't know if this is the way the pros do it this way I set the optical focus set to min then move the screen or projector as close to the screen as possible to achieve good optical focus this will give you the best view of the dot pattern while you adjust the rings.
Edit: Before you start focus you should make sure the yoke is level. Probably should do this before installing the lens.
If I'm wrong about this someone please chime in.
Good luck!
DECLAIMER: DO NOT ADJUST YOUR MAGNETICS UNLESS YOU MUST!
BTW...What are you going to do with the cooked tube?
Mike
_________________
Doing HD since the last century!
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Wed Mar 19, 2008 6:21 pm Post subject: |
|
|
Mike, thanks for the tips and I will be sure to take note of my raster size before doing anything else. I did read somewhere about leveling the yoke first thing and then setting phase. I'm using a guide by JRobbo for the tube change and reading everything I can get my hands on.
I'm not sure what I will do with the other tube. Honestly, if I had not needed to expand the raster size to fit my current screen size and throw then I would have lived with it because it's really not that bad if you stay in the wear pattern. I guess I have a few options. Sell the tube alone or put it in the 110 and sell that as a complete machine. I believe this tube was used in an installation with about a 96" wide screen.
_________________
"Coffee is for Closers."
|
|
| Back to top |
|
|
MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
|
| Posted: Thu Mar 20, 2008 12:32 am Post subject: |
|
|
| dropzone7 wrote: | Mike, thanks for the tips and I will be sure to take note of my raster size before doing anything else. I did read somewhere about leveling the yoke first thing and then setting phase. I'm using a guide by JRobbo for the tube change and reading everything I can get my hands on.
I'm not sure what I will do with the other tube. Honestly, if I had not needed to expand the raster size to fit my current screen size and throw then I would have lived with it because it's really not that bad if you stay in the wear pattern. I guess I have a few options. Sell the tube alone or put it in the 110 and sell that as a complete machine. I believe this tube was used in an installation with about a 96" wide screen. |
Good....I just didn't want to see you throw it away. It didn't look that bad, I bought a 852 cheap and expect it to have cooked tubes. I would like the get another 852 and set up a blend using TVOne C2-260 cards. It will require some major revamping in my theater and would like to prove it works before I jump in with both feet and tear up the theater. It sounds like the 852's would do the job nicely as the higher scan rates are not required for a blend yet the 852 can be sharp as a tack. Your tube looks like it would be good enough to experiment with.
The recommended resolution for a 2:40 AR blend is 1066X800 however I might need to go higher as my XG has very noticeable scan lines at that resolution. I would like to get second 1351 but the prices are still on the high side for the LC’s and I just don’t think it would be needed for a blend, plus the light output is not much more on an LC so it just seem like more of a waste.
To be honest I think I have done about as much as I can with my 1351 and think I want to more, a blend is about the only way get more out of an 8" CRT and is on the exotic side without breaking the bank. G90's with all the reliability issues and LUG costs scare the hell out of me.
Mike
_________________
Doing HD since the last century!
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Thu Mar 20, 2008 1:23 am Post subject: |
|
|
Wow, that sounds like quite a project Mike. It would be cool to see an XG blend as the G90's always get all of the hype for that. I would be happy to just get one of these XG's looking good. That's a limitation of my skills though and not the projectors but I'm trying to learn. I will hold onto this tube until I know that I at least have one working projector. Paul also expressed some interest in it so I will check back when I'm ready and see who needs it.
_________________
"Coffee is for Closers."
|
|
| Back to top |
|
|
dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
|
| Posted: Thu Mar 20, 2008 1:29 am Post subject: |
|
|
Drop,
Make sure you have the focus yoke alignment sleeve in place. It goes between the deflection and focus yoke. Doug
|
|
| Back to top |
|
|
Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
|
| Posted: Thu Mar 20, 2008 1:35 am Post subject: |
|
|
|
It's always handy to have burnt tubes to swap in if your pj develops a fault. I have a burnt set for just this reason.
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Thu Mar 20, 2008 1:43 am Post subject: |
|
|
| dbaisey wrote: | Drop,
Make sure you have the focus yoke alignment sleeve in place. It goes between the deflection and focus yoke. Doug |
Yeah, that thing fell out in my hand and scared the crap out of me thinking I had broken something. When I took the donor tube from the 110 this piece was missing. I know that this was a fairly new tube so I guess it got lost in the change. There was also no silicone on the magnets so I went ahead and applied some just in case I have to go back to that unit.
|
|
| Back to top |
|
|
Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
|
| Posted: Thu Mar 20, 2008 1:45 am Post subject: |
|
|
You need that sleeve or it will drift (I know that because Doug told me  )
|
|
| Back to top |
|
|
dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
|
| Posted: Thu Mar 20, 2008 1:47 am Post subject: |
|
|
You will have no stability (drift) without it. I try to mention this as much as I can and its important. Doug
You can wiggle the yoke and the raster centering will change all over the place. Now think thermal changes and what it will do.
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Thu Mar 20, 2008 1:50 am Post subject: |
|
|
I did not notice how it went on but seeing as how it's tapered I suppose it will only fit one way. I will have to check my newly acquired service manual for that. Pretty cool "exploded" diagrams of the projector in those.
_________________
"Coffee is for Closers."
|
|
| Back to top |
|
|
MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
|
| Posted: Thu Mar 20, 2008 1:52 am Post subject: |
|
|
| dropzone7 wrote: | | I did not notice how it went on but seeing as how it's tapered I suppose it will only fit one way. I will have to check my newly acquired service manual for that. Pretty cool "exploded" diagrams of the projector in those. |
That's about the only thing thats cool about the manual...I find it very lacking.
Mike
_________________
Doing HD since the last century!
|
|
| Back to top |
|
|
dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
|
| Posted: Thu Mar 20, 2008 1:52 am Post subject: |
|
|
|
Taper to the inside to fit the taper of the focus yoke. When pushed up to the deflection yoke it aligns the focus yoke. Doug
|
|
| Back to top |
|
|
dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
|
| Posted: Thu Mar 20, 2008 1:58 am Post subject: |
|
|
| dbaisey wrote: | | Taper to the inside to fit the taper of the focus yoke. When pushed up to the deflection yoke it aligns the focus yoke. Doug |
Cool, thanks Doug. It would be so nice if you were close by. I would love to be able to pick your brain for an afternoon.
|
|
| Back to top |
|
|
MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
|
| Posted: Thu Mar 20, 2008 2:01 am Post subject: |
|
|
Just curious...does anyone know what rebuilt tubes run for a 852?
Mike
_________________
Doing HD since the last century!
|
|
| Back to top |
|
|
Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
|
| Posted: Thu Mar 20, 2008 3:13 am Post subject: |
|
|
| MikeEby wrote: | Just curious...does anyone know what rebuilt tubes run for a 852?
Mike |
DO NOT BUY "REBUILT" TUBES.
If you have enjoyed the super sharp, great images you get from an NEC, don't buy a "rebuilt" tube. Seriously.
I've had experience with "rebuilt" tubes, they SUCK. Period. They should not be considered an option.
They are soft, have poor focus, and wear incredibly fast(under 100 hours for wear to be easily visible...).
I believe the only US supplier of tubes still has "new" tubes suitable for an NEC. They are the only ones you should consider.
|
|
| Back to top |
|
|
|
|
