|
|
Post by stridsvognen on Jan 23, 2018 11:25:40 GMT -5
You will not gain much playing with the focus system as the videochain is acting as it do in the original Marquee, so from my perspektive you atacking it from the wrong side, if you want a bit of competition ill be happy to challenge any yoke system you can put together, with a standard yoke setup, but modified videochain.
I can say i have seen videochains bloom at 5fl, and identical projector with a different videochain handle over 10fl without blooming, just make MP make you a set of boards and ull see how much focus controle and lightoutput you can loos.
|
|
|
|
Post by thelasttubewarrior on Jan 23, 2018 23:37:07 GMT -5
I've seen a single Marquee change its focus performance dramatically just by replacing a weak old LVPS with one that had just been freshly recapped. I'm sure we will all agree that every circuit works better when the power feeding it is clean, quiet, and stable.
The odds of me ever doing any kind of business with MP are just about precisely zero. He promises the sun and you're lucky to get mooned. It takes forever for him to deliver anything and when he does, as often or not it's utterly bizarre and only works under very unusual circumstances.
I'd have NO issues dealing with you or anybody else in this CRT forum that I know so far. But no, I'm not going to deal with MP. I prefer to stop BEFORE I get burned.
I'm not interested in competing with you regarding focus system changes. You can do your own experiments if you wish, be my guest. But I'm doing these experiments for PERSONAL REWARD and that's the only reason to do it because it's certain that there isn't a dollar to be made off it no matter how successful it might be.
I'll be quite happy to share my results when I have some actual results to offer. When that time comes I'll post my results even if they don't make any improvement. But I'm not at that point yet. I just ordered the JRC connectors I need to build the adapter cables so it's going to be a while before the parts are even in hand.
|
|
|
|
Post by stridsvognen on Jan 24, 2018 12:16:07 GMT -5
Ill recommend you to start with a good testpattern, a meter to measure lightoutput, and then establish a reference, like optimize flare magnets so you dont need any stig in the center zone, and specify a resolution/ bandwidth, then crank the contrast up to the point you find where it starts blooming, i usually do that by looking into the lens from way back, just in front of the screen, so you use the lens as a magnifying glass, and see everything, then focus the lens as good as it gets, shift to a 100% IRE 25% window and measure your lightoutput at 6500 Kelvin, then you established the limit of your focus capability, and you can do a screenshot of the center pattern, a closeup so that there is not a hint of doubt how it looked when you started, then repeat it all when modified, and you will then have documentation to present supporting your work, eliminate all guesswork and subjective evaluation.
what video processor do you have.?
|
|
|
|
Post by thelasttubewarrior on Jan 24, 2018 16:24:32 GMT -5
As for video processors, I have the following Lumagen units:
VisionPro
VIsionPro HDP
HDQ
The HDP and HDQ are essentially the same unit with different connector options. They run identical firmware. I've placed DVI to HDMI adapters on the HDQ and they work just fine.
I don't necessarily run a video processor. I have one of the Moome HDMI ports connected directly to the HDMI output port
of the Sony BDP or UHD player I'm using at the moment. (Thanks to some free players acquired over the last year, I have in total,
five BP or UHD players to choose from.)
I can also directly generate test patterns via PC or via one of my QuantumData test generators. Or from my Sencore CM2125, which allows resolutions of up to 2048x2048.
When I get to that point, I'll do the photo documentation from a tripod mounted camera placed at a marked position relative to the screen. Conditions for the evaluation will be as scientifically valid as I'm able to achieve.
Hey, what are the chances that you have a few of the "new style" VDC designed neck cards that need a home? I'm looking for a set.
|
|
|
|
Post by stridsvognen on Jan 25, 2018 9:21:08 GMT -5
I have shitpiles of those VDC neckboards, as they are totaly useless for my aplications, MP borowed a set from me a few years ago wich he constantly forgets, so you can contact him as if he are ready to deliver back, if so im sure we can make a deal on that set, as im not going to ship anything over there.
|
|
|
|
Post by jbmeyer13 on Jan 26, 2018 15:27:52 GMT -5
Right now im running 11fl on a 110" screen with LUG tubes, all neutral gain screens, so i dont buy the original yokes are crap. There is lot of crap in the marquee design, and lot of electronic adjustments are better left alone, and performed mecanically as far as possible. I agree with Kurt regarding the yokes. He spent over 40-hours tweaking my set up and we swapped in/out my frankenyokes twice and could not observe any advantage over the stock yokes (hence the reason we spent 40-hours...). I really wanted to be able to say the frankenyokes offered an advantage but it simply was not the case and in the end they are packed up in a box sitting under my workbench. In my experience, the right video chain, careful lens selection and a VERY lengthy set up process are what is needed to max out the Marquee. If any of those variables are lacking the image will not reach it's potential. |
|
dacka
New Member
Posts: 1 
|
Post by dacka on Jan 26, 2018 19:10:01 GMT -5
Chris, you should try pushing forward the yokes the furthest as well, like I did. I Think I got better focus from that and I'd like to see someone else try it too, I hate it to be just an grand illusion.
|
|
|
|
Post by thelasttubewarrior on Jan 26, 2018 19:52:46 GMT -5
You might note that I mentioned yoke position as being one of the very reasons why I consider the previous FY yoke experiments to be a failure. When used with the stock Marquee deflection and convergence yoke assembly, the focus yokes made for most other projectors can not be placed far enough forward on the tube neck.
This is why I am specifying that the G90 DEFLECTION yoke needs to be run along with the G90 focus yoke, via a modded HDM, if tried out on a Marquee. Then you have the focus yoke in its proper location on the tube neck.
If you simply try to run ANY non-stock focus yoke in a Marquee all by itself, I would not expect full success for any of several reasons, and yoke position on the tube neck is certainly one of them.
I found that Barco 909/1209 focus yokes are OK with regard to positioning, but could never get them to work properly in both the central and outer regions of the raster at the same time. The 909 deflection yokes have to be substantially reworked to be fully compatible with the Marquee HDM as both H. field windings are hard wired into a series configuration.
Like I said, the G90 yoke experiment is going to be my last one. I've exhausted all other alternatives anyway. It's G90 yokes or stock yokes, and that to be determined by upcoming test results.
The difference in focus stability and retention between a Marquee and a G90 over the full range of contrast is in no way subtle
or easy to overlook, in my experience. Maybe you've encountered an unusually stable Marquee but so far the focus stability of
the G90 has always made the Marquee look shameful so far, to my eye.
|
|
|
|
Post by stridsvognen on Jan 27, 2018 9:49:36 GMT -5
The G90 has much better and stable electronics to operate all the magnetical system, you want to pair the defective Marquee electronics with G90 yokes, why would you think that magically will gain anything without the G90 controle system/ electronics.
A G90 can controle focus, shif and geometry stable, the Marquee never been able to do that, and for that reason alone you need the Marquee yokes to do the mecanical raster centering as any use of the electric features to do so in the Marquee represent a problem.
So ill say you totally missed whats the actual problem, and how the Marquee operates.
|
|
|
|
Post by Admin on Jan 27, 2018 11:42:10 GMT -5
The frankenyokes modification is a viable option for those who cannot afford or have the electronic ability to do video chain modifications. It is a poor mans modification that does have proven results.
|
|
|
|
Post by stridsvognen on Jan 27, 2018 11:49:04 GMT -5
The frankenyokes modification is a viable option for those who cannot afford or have the electronic ability to do video chain modifications. It is a poor mans modification that does have proven results. So where is the proven results.? Maybe you can present your test results.? How much did you boost lightout at a specifik spot size.? Just by changing yokes.? And how did you deal with the raster ringing.? |
|
|
|
Post by Admin on Jan 27, 2018 11:52:33 GMT -5
The frankenyokes modification is a viable option for those who cannot afford or have the electronic ability to do video chain modifications. It is a poor mans modification that does have proven results. So where is the proven results.? Maybe you can present your test results.? Kurt. Please don't start. I have no desire to start deleting your posts again. This has all been documented years ago on 2 different sites. Nobody is stating that your results are not valid. Only that there are options for those with lesser options. So let this go to rest.  |
|
|
|
Post by gjaky on Jan 27, 2018 14:48:22 GMT -5
The frankenyokes modification is a viable option for those who cannot afford or have the electronic ability to do video chain modifications. It is a poor mans modification that does have proven results. First, focus-ability and video chain are only share the fact that both play role how the picture is drawed, but one can't substitute the other. Unrelated, but these days video chain modifications are really affordable LOL  Chris should go on with his tests of course, but for your point: when the ingredients for this modification start with "take a full yoke set of a G90" it's not going to be poor man's modification Although while I'm not against this experiment at all but want to warn Chris -again- that overriding the current limit on the HDM is not the right thing to do. Each G90 winding is 3 times smaller than the Marquee's. For the full deflection a certain amount of magnetic field is needed. Now for 1/3 inductance you need 3 times the current for the same magnetic field. So while overriding the over current sensing circuit might sound a good idea, but I guess the scan regulator circuit on the HDM is not designed to handle the 3 times load. |
|
|
|
Post by Admin on Jan 27, 2018 14:58:17 GMT -5
My comment was for the focus coil only. Not the deflection yoke. But if someone wants to experiment and it can be done so safely then why not. You guys did a lot of your experimenting without knowing the outcome. So why be criticizing him with out having any basis. Comment after the fact if need be. |
|
|
|
Post by Admin on Jan 27, 2018 15:00:46 GMT -5
Unrelated, but these days video chain modifications are really affordable LOL Let me also add that very little has been posted on the results of your modifications. I was hopefully waiting. |
|
