|
|
Post by Casethecorvetteman on Feb 6, 2017 13:17:26 GMT -5
Hi all,
I finally got around to unpacking and installing my modded boards from Greg.
First off the standard of work gone into these is top notch. If i didnt have standard boards to compare on the bench, id hardly be able to tell theyve been touched.
The switcher and RGB boards went in first and i fired up the test videos for a look, there was no sharpness improvement, but much less noise, it could barely be seen.
Threw in 2 modded neckboards next, and the noise was no longer visible from the viewing position. Can hardly see it from 1 meter away from screen.
I had a brand new factory original Barco green tube is there, with 103 hours on it, and as sharp as it was i wasnt happy with it.
I took it and the mildly contaminated blue tube out and installed a lower hour blue ( both are pretty new, the internals of the bell are still almost silver ) and put my 385 hour Eisemann green back in.
The Eisemann green is sharper by enough to notice it. It shows scanlines very clearly at 1920x1080p.
The low hour red i installed a few months back is by far the sharpest red ive seen, so it got to stay. It shows clear scanlines at 1920x1080p all the way to the corners.
The astig/focus/lens flapping was all redone, full 4 & 6 pole zone astig on all 3 tubes, balanced the blue uniformity by using 6 pole electronic astig.
The image is no sharper than i had before, but signifant drop in visible noise.
The combo of those two razor sharp tubes, Greg's mods, and a fair few hours calibrating everything yeilded the best image ive seen to date.
|
|
|
|
Post by gjaky on Feb 6, 2017 16:10:04 GMT -5
Nice to hear Greg could made advancement to the 909  |
|
|
|
Post by stridsvognen on Feb 6, 2017 17:56:52 GMT -5
Did you try shoot a SMPTE pattern before and after, is there a visible difference in bandwidth performance on the test pattern.?
|
|
|
|
Post by gregstv on Feb 6, 2017 18:43:34 GMT -5
Thanks Casey,
I don't think bandwidth will be that much better. Maybe a little on the switcher. The aim was to reduce noise and give better depth.
|
|
|
|
Post by Casethecorvetteman on Feb 6, 2017 19:34:09 GMT -5
Did you try shoot a SMPTE pattern before and after, is there a visible difference in bandwidth performance on the test pattern.? No i only watched the demo videos on my Spears & Munsil bluray. My set was always very sharp anyway, and i dont think there was ever going to be much to be gained there, but it certainly looks much nicer without the noise. |
|
|
|
Post by gregstv on Feb 6, 2017 22:22:00 GMT -5
I am playing with AD8009 OP amps in place of the HFA1100. Once I am happy with them I will send a set of boards to Casey to compare. These amps have much better slew rate and a bit more and width.
I have purchased a Tektronics 2465a oscilloscope that will be here next week. Hopefully be able to compare the difference between the changes with this unit.
|
|
|
|
Post by Casethecorvetteman on Feb 7, 2017 0:46:43 GMT -5
i spend a pretty long time getting astig and focus just right over the whole screen, and i think this makes the biggest impact on image sharpness, but having said that you need the right set of tubes and the right input source and path etc.
Ive noticed some P19LUG tubes go just that much sharper than others too, like the 4 reds i have here, 2 of them are clearly not as sharp as the other two, and one is Eisemann sim grade sharp. All are Barco originals.
|
|
|
|
Post by gjaky on Feb 7, 2017 1:35:28 GMT -5
Did you try shoot a SMPTE pattern before and after, is there a visible difference in bandwidth performance on the test pattern.? No i only watched the demo videos on my Spears & Munsil bluray. My set was always very sharp anyway, and i dont think there was ever going to be much to be gained there, but it certainly looks much nicer without the noise. Interesting, but afer performing the bandwidth mod on my XG not the sharpness got better but the color tracking, like a haze came off the screen, it is kind of logical since good bandwidth tracks the signal variations faster, movie materials are not really stuffed with high bandwidth content like 1:1 pattern. |
|
|
|
Post by gregstv on Feb 7, 2017 5:31:45 GMT -5
You probably noticed a big difference due to how bad your bandwidth was.
I have to say my 919 is looking fantastic. Very sharp with great picture depth.
Once I get the oscilloscope I will see what differance there is between the HFA1100 and the AD8009 amps hopefully. The AD has much better slew rate and a bit more bandwidth.
|
|
|
|
Post by Casethecorvetteman on Feb 7, 2017 6:03:47 GMT -5
Greg do you get easily visible scanlines on your red and green at 1920x1080p 60Hz?
|
|
|
|
Post by Casethecorvetteman on Feb 7, 2017 6:09:05 GMT -5
|
|
|
|
Post by barclay66 on Feb 7, 2017 6:28:24 GMT -5
I am playing with AD8009 OP amps in place of the HFA1100. Once I am happy with them I will send a set of boards to Casey to compare. These amps have much better slew rate and a bit more and width. Hi,
I will be doing something similar with Marquee Neck Boards soon. Instead of the CLC449 (or HFA1100 on older boards) I will be trying out the AD8009, the LMH6732 and the OPA695. To me, not only the slew rate but especially the 0.1dB bandwidth is crucial. I've made a comparison chart and to me the AD8009 seems to have a weak point with its low 0.1dB bandwidth. The OPA695 looks much more promising...
OP Overview.xlsx (10.79 KB)
Regards,
barclay66
|
|
|
|
Post by Casethecorvetteman on Feb 7, 2017 6:58:25 GMT -5
Another thing to add, convergence accuracy is just as critical to overall sharpness as astig and focus are. Unfortunately the Cine 9 cant achieve pixel perfect focus all across the screen the way an NEC can, but if you set the mechanical side of things as perfect as possible, itll go damn close.
Its a real shame they didnt add the same level of convergence adjustment as NEC did, it wouldve made for a phenominal image.
As good as the electronic astig is, i wish they had 2 pole electronic adjustment on the Barco, as well as the ability to adjust it seperately for different scan rates.
If i compare 1280x720p between the Cine 9 and XG, there really is very little in it, but the XG certainaly takes the prize at 800x600, the Barco eats it at 1920x1080p due to the 9" tubes, which makes it a perfect movie watching set.
|
|
|
|
Post by gjaky on Feb 7, 2017 9:41:01 GMT -5
I am playing with AD8009 OP amps in place of the HFA1100. Once I am happy with them I will send a set of boards to Casey to compare. These amps have much better slew rate and a bit more and width. Hi,
I will be doing something similar with Marquee Neck Boards soon. Instead of the CLC449 (or HFA1100 on older boards) I will be trying out the AD8009, the LMH6732 and the OPA695. To me, not only the slew rate but especially the 0.1dB bandwidth is crucial. I've made a comparison chart and to me the AD8009 seems to have a weak point with its low 0.1dB bandwidth. The OPA695 looks much more promising...
Regards,
barclay66
What is funny about the OPA695 is that it is actually specified for 0. 2dB flatness of 320MHz, if you look at that way the AD8009 is about the same. Furthermore with the OPA695 there is no actual curve shown for the gain flatness performance either. |
|
|
|
Post by stridsvognen on Feb 7, 2017 10:27:46 GMT -5
Moome uses the AD8000 as output buffer, or AD8003 i think on the SONY AND Barco cards. i think they performs ok on that location, i bypass them on the Marquee card.
I dont remember if i been trying the AD8009, most likely, for the Marquee neckboard i prefer the EL5166 or CL449, who with the generator tracks pretty much the same up to 330Mhz, none of the others have done that, they always seem to distort way before, i have a feeling that the CL449 is a bit more transparent than the EL5166, so lately i just been sticking to the standard setup and lowered the gain a bit on that opamp.
|
|
