CurtPalme.com Home Theater Forum

[greg9518lc]

Been running Sock neck cards at 207.443 mhz 1080p 71.928 hz for the last 3 weeks with good results. Not sure
VDC designed them for that but they have come alive in my machine and plenty of pop. AT 60hz 178mhz these new
cards are turds so porch settings must be accounted for the surprising improvement of the cards.

They are razor sharp and have some good qualities about them that the old boards do not posses with
the lug tubes in the marquee. So it looks like life is a trade off you take some good with some bad
and these new boards posses more good 10ftl 110" lugs than bad. Enough to let my modded boards go to a new home
and go a different path as there is more than one way to get to the finish line.



Cm I am sure you have some ideas floating in your head feel free to chime in...

[cmjohnson]

How's the greyscale tracking?

How do they work out at high contrast levels?

I spoke to the designer of those cards and asked why they're reportedly sharper with LUG tubes and he found that question to be
interesting and said he'd have to think about it. He designed those cards more than 10 years ago, you can't expect him to remember everything about what he did.

I can assure you, any apparent sharpness increase has nothing to do with the video amplifier chain itself.

But there are components on the card that connect to every part of the electron gun assembly and if any values or circuit constants
changed in the right direction, then it is reasonable to accept the proposition that they are better matched to the requirements of the LUG tubes' electron gun assembly, which it must be noted, is significantly different from the electron gun assembly of an LCP tube. It adds a third grid but other elements had to be changed to accomodate that added grid. So really, we can't assume that anything about the LUG gun assembly is exactly the same as an LCP's guns.

It's just a simple fact that LUG tubes are not just LCP tubes with a smaller electron beam exit and an added grid. They need to be looked at as a whole different tube with significantly different characteristics.

I have ONE remaining brand new "new" 0340 neck card I saved to experiment with it. I'll be doing those experiments soon, once I've got my full G90 magnetics system running as desired.

One thing I do want to make note of, though, is that for you to make a fair comparison between a classic neck card and a new one, be sure that the classic card has had aged capacitors replaced with new ones. It's not fair to compare two circuit boards when one may be 20 years old and the other may have been made just two years ago. The older card needs an overhaul to be brought up to original specifications and performance. THEN, the comparison is most meaningful.

[greg9518lc]

Fair enough CM and the tracking is quite good at the higher bandwidth with a few changes and progress
is being made in that department that's why I held on to 8 sets of them with all the lug available a solution
will be found soon. I am aware of the caps and they were upgraded in the old boards as well as the new. No
question I am moving in the right direction and the new boards are progressing nicely. Work on peaking and
lineararity has also been moving along and will be running the new boards at the meet. I agree the new boards
on lcp tubes is horrible as they have been tested in a lcp machine. With 3 months before the meet I would
think they will be close enough done tested and calibrated and as they stand now will fair well against the
Rs600👍

Work is being done by my service tech at the shop so far I am out 3 cases of beer

[cmjohnson]

I expect that before the meet I'll have the G90 magnetics system completely ironed out. If it works as well as my early experiments promise, then it's something you might consider adding to your own projector.

I'm telling all about these experiments in the related topics. Nothing proprietary, no secrets, use it if you want to.

I think I'm going to have to make a very limited run of CPC driver boards. Not sure how many, but not less than three
in any event due to minimum order quantity requirements from the PC board houses. So at least one will be available off the prototype order.

[greg9518lc]

I know I will pass CM as the stock magnetics and lugs are plenty sharp. Heck 1080p desktop is lazer sharp and
I already need to defocus 1080p not to see scan lines and star stepping. With the old cards they would never focus
but sure looked good. With the meet moving forward as planned had to find a game plan that I could pull off in
time.

So I am figuring out the new cards out and use them for personal use and enjoy my lugs the way they were
meant to be used. With only a few changes they are more than acceptable in my machine.....

[cmjohnson]

The advantage that I'm seeing, so far, with the G90 magnetics is that they are extremely stable with changes in contrast level. If you decide to crank up the contrast, focus will stay very sharp. We've seen that before with other "frankenyokes" but this appears to take focus stability to a new level.

Plus I'm designing a control board so I can run the G90 electronic CPC yokes on a Marquee as well.

[greg9518lc]

I may hit you up on this after thinking about this for a minute it could be of some use
so who knows the contrast blooming you talk about starts at 91 and the 10ftl threshold
Can be seen on text but not video.

[greg9518lc]

Here is what a MP vim can do with stock lug neck cards on lugs with a 35.00 LG BLURAY player 1080p 60hz
using an ipone. The moral of the story is I am dumping the pc and moving on with my life as windows is broke
and will never work right.

[img][/img]

[AnalogRocks]

You know I did that back in 2009. I got a a bluray plyer and watched many, many movies. Couple years later I got the HTPC back out but NOT to do bluray. It records TV shows for me all the time. Good aplication for it.

Skip the BS and get down to watching movies. Use the HTPC to tinker.

[AnalogRocks]

You know I did that back in 2009. I got a a bluray plyer and watched many, many movies. Couple years later I got the HTPC back out but NOT to do bluray. It records TV shows for me all the time. Good aplication for it.

Skip the BS and get down to watching movies. Use the HTPC to tinker.

[greg9518lc]

[thewolfman]

[mp20748]

[thewolfman]

[greg9518lc]

[thewolfman]

[cmjohnson]

There's no reason to run your refresh rate faster than you need it to be in order to not see any flicker.

In fact, the higher the refresh rate, the higher the bandwidth requirement. You're better off to run the lowest refresh rate
that looks good to you. If you don't see flicker at 60 Hz, running at 72 Hz is going to make the picture SOFTER if you're already near the bandwidth limitation.


I remind you, pixel clock and bandwidth are related but they are not the same.

Pixel clock is DOUBLE the video bandwidth, at best. If you're running a 210 MHz pixel clock, then your video signal bandwidth is not more than 105 MHz.

[greg9518lc]

Stock cards is as far as I can take them fun while it's lasted but time to move forward
now it is time to try different cards. These where 2008 new style red and green and old style on blue



[img][/img]

[CIR Engineering]

Do you guys know what judder is and why you should run BD at 72Hz and not 60Hz on a CRT (digitals use 96Hz or 120Hz usually)? It has nothing to do with flicker. 72Hz is an even multiple of 24Hz and will not have judder. Google. It's very important to run BD at 72Hz. This may be 1080p for 16x9 or 818~800x1920 for 2.35 and higher aspect ratios. And no, if you do active area scanning properly 818x1920 does not "scale" the image and maintains 1:1 pixel mapping.

craigr

[greg9518lc]

[gregstv]

I am running 1080p@48. The DVDO wont do 72hz without a lot of mucking around. I always have thought that pushing the scalar to its limits would affect the picture quality. Am I wrong in thinking this?