| Author |
Message |
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
 |
Revox
Joined: 13 Feb 2008
Posts: 158
|
| Posted: Thu Sep 10, 2009 11:41 pm Post subject: |
|
|
Shure.
I defocused totally via picture controls , and then under service controls i let the center as it was. Then i looked at the size of the dots in the center (with a sheet of paper i made a model of those) and focused in the corners.
So last time i arranged the convergence. I think with my PT 65 lenses there is not much headroom of sharpness left. green is slightly less sharp than red.
Am i right, that the PT 65 are slightly better than HD8 rev. B.?
| Description: |
Screenshot at 1920x1080 @ 75Hz i
left corner |
|
| Filesize: |
298.77 KB |
| Viewed: |
4439 Time(s) |
|
| Description: |
Screenshot at 1920x1080 @ 75Hz i
middle screen |
|
| Filesize: |
216.37 KB |
| Viewed: |
4441 Time(s) |
|
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Posted: Fri Sep 11, 2009 6:34 am Post subject: |
|
|
|
a little soft , grainy, and noisy but that's normal for a stock Marquee, especially an older one.
|
|
| Back to top |
|
|
Revox
Joined: 13 Feb 2008
Posts: 158
|
| Posted: Fri Sep 11, 2009 8:13 am Post subject: |
|
|
I think a 1998 model isn't older? The noise comes from the camera. It's interesting, pictures always look softer than the original.
Is it normal that the sharpnes on green cannot be as good as the sharpness on red?
Stock, you mean untuned with new caps and so on..
|
|
| Back to top |
|
|
Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
|
| Posted: Tue Sep 29, 2009 4:29 pm Post subject: |
|
|
Revox, how are you making out with your 8500 setup? Curious if you finished it up and got the picture sharpened with less graininess.
Paul
_________________
~Paul
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Posted: Tue Sep 29, 2009 4:35 pm Post subject: |
|
|
| Revox wrote: | | Is it normal that the sharpnes on green cannot be as good as the sharpness on red?.. |
no it's not supposed to be but since green is run harder the electronics on it age faster, caps on VNB start to leak.
| Revox wrote: | | Stock, you mean untuned with new caps and so on.. |
yes, but other things too like better lenses, optimized source which IMHO means a Moome card, etc.
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Tue Sep 29, 2009 4:52 pm Post subject: |
|
|
| draganm wrote: | | Revox wrote: | | Is it normal that the sharpnes on green cannot be as good as the sharpness on red?.. |
no it's not supposed to be but since green is run harder the electronics on it age faster, caps on VNB start to leak.
| Revox wrote: | | Stock, you mean untuned with new caps and so on.. |
yes, but other things too like better lenses, optimized source which IMHO means a Moome card, etc. |
I dont know drags, every marquee i have had the red has been razor sharp and the green not nearly as good. My theory
but I never got around to proving it is the green is right between two Boards that produce some EMI noise that it picks up, also the HV splitter is right on top of the tube. the HDM is the worst noise generator in the Marquee, it has the Flyback generator, a bunch of coils, relays and inductors and mosfets. I have been wanting to use some kind of EMI/EMF
blanket/jacket to put all around the tube to isolate all that from getting to the focus coil and the tube itself. I was just doing some rough schiemphluge on the one pj and noticed that again, i have asked this question so many times but it has fallen on deaf ears. A good experiment would be to move the green tube to the red location. One more thing i s when i was testing the VNB mod to use the thomas tubes was, that green tube was sharpest of all i have seen and most of it was because i had the tube out of the chassis siting on top of the other green tube.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
Revox
Joined: 13 Feb 2008
Posts: 158
|
| Posted: Tue Sep 29, 2009 4:54 pm Post subject: |
|
|
Ok, ill change the VNB cabs soon.
The grainness comes out of my camera not out of my PJ.
For me it was not possible to do something against the red focus problem:
When i defocus the Image shifts but my ASTIG ist perfect!
The only way to get rid of this phenomen is to shift the red focus coil to the bottom. You can guess that centering isn't possible then!
|
|
| Back to top |
|
|
Revox
Joined: 13 Feb 2008
Posts: 158
|
| Posted: Tue Sep 29, 2009 5:00 pm Post subject: |
|
|
You can try to build an antena for a scope. Then you can make test's in the red, blue and red Position
Is possible that the phosphor of the green tube is "transporting" the energy better to areas around the electron ray. This is important to minimise the wear of this tube?
On all my PJ's the red Tube have the best sharpness.
A Copper plate between the boards is a good start?
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Tue Sep 29, 2009 5:03 pm Post subject: |
|
|
| Revox wrote: | Ok, ill change the VNB cabs soon.
The grainness comes out of my camera not out of my PJ.
For me it was not possible to do something against the red focus problem:
When i defocus the Image shifts but my ASTIG ist perfect!
The only way to get rid of this phenomen is to shift the red focus coil to the bottom. You can guess that centering isn't possible then! |
the focus coil and astig have to be done together and checked after each centering adjustment. first you mus nullt he astig magnets by pulling them out and moving all the tabs together. then center the grid with the focus coil, cpc magnets still nulled. then if you need to use the CPC to center the grid more do so and also start with the CPC astig shaping of the dots as you normally would, BUT also checking the centering of the focus coil too. ramp focus up and down till you do not get the grids to move, you might have to go back and forth up to 4-10 times before they don not move more than a cm. its a pain in the ass especially when you cant get the focus coil to move and stay where you want it!!! But practice makes perfect. and what really sucks is if you did the magnets while the PJ is on the floor and then ceiling mount it, you have to do it all over, just put my Longbow up top and the dots are no longer in the center
of the blob!! SUCKS!!!!
good luck and keep at it!!!
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Tue Sep 29, 2009 5:07 pm Post subject: |
|
|
| Revox wrote: | You can try to build an antena for a scope. Then you can make test's in the red, blue and red Position
Is possible that the phosphor of the green tube is "transporting" the energy better to areas around the electron ray. This is important to minimise the wear of this tube?
On all my PJ's the red Tube have the best sharpness.
A Copper plate between the boards is a good start? |
I put a copper covered metal plate above the VIM in the MDM slot, i have the copper foil (roof flashing)
that i have been meaning to cover the HDM and FCM cases with to get more protection, but there is better stuff out there to trap EMF and EMI noise. Most people think its Voodoo but it might work in this situation where you'll be able to see a different and not like in audio where its subjective.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
Revox
Joined: 13 Feb 2008
Posts: 158
|
| Posted: Tue Sep 29, 2009 5:38 pm Post subject: |
|
|
I don't know how to null the manual Astig. You know i only got the 2 Pole Astig.
On green and blue everything is perfect now, thats the reason why i think my abilities are Ok (can't be luck?).
The 2 Pole Astig has not the force to correct my phenomen! Doesn't matter in which position.
Only the extreme shift of the Focus coil (kisses the tube and Picture is 1m off screen) fixed it.
Is it possible that the red focus coil's permanent magnet is defect?
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Posted: Tue Sep 29, 2009 6:58 pm Post subject: |
|
|
| Nashou66 wrote: | I dont know drags, every marquee i have had the red has been razor sharp and the green not nearly as good. My theory but I never got around to proving it is the green is right between two Boards that produce some EMI noise that it picks up, also the HV splitter is right on top of the tube. the HDM is the worst noise generator in the Marquee, it has the Flyback generator, a bunch of coils, relays and inductors and mosfets. I have been wanting to use some kind of EMI/EMF blanket/jacket to put all around the tube to isolate all that from getting to the focus coil and the tube itself. I was just doing some rough schiemphluge on the one pj and noticed that again, i have asked this question so many times but it has fallen on deaf ears. A good experiment would be to move the green tube to the red location. One more thing i s when i was testing the VNB mod to use the thomas tubes was, that green tube was sharpest of all i have seen and most of it was because i had the tube out of the chassis siting on top of the other green tube.
Athanasios |
yes that's all true, noise from HMD is all over B + G. Someone else discovered this and when I read it and looked for it was there. So Red will be slightly cleaner but AFA focus, spot size, they should be pretty close. B is the only one that's typcially and substantially softer due the the scatter in the short wave-length I believe. It sounded though like Revox was talking strictly focus on green, and it should be pretty good.
|
|
| Back to top |
|
|
|
|
