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Post by gregstv on Feb 7, 2017 14:29:08 GMT -5
Greg do you get easily visible scanlines on your red and green at 1920x1080p 60Hz? Yes I can if I look into the lens. If I get close to the screen I can see them on a white picture but only just. My eyes are not the best. |
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Post by gregstv on Feb 7, 2017 22:32:15 GMT -5
The AD8009 is a later chip using the later design technology.
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Post by Casethecorvetteman on Feb 8, 2017 4:05:43 GMT -5
Greg do you get easily visible scanlines on your red and green at 1920x1080p 60Hz? Yes I can if I look into the lens. If I get close to the screen I can see them on a white picture but only just. My eyes are not the best. My eyes arent what they used to be, but with the Eisemann green and my current red i can see them from about a meter out. Its extremely sharp. |
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Post by stridsvognen on Feb 8, 2017 10:17:47 GMT -5
what pattern do you guys use to set focus, a resolution or a grid pattern.. If i focus a 100% IRE white grid on black background to be the sharpest, my hi resolution like the pixel phase or SMPTE 1:1 is not so good, and if i focus to best SMPTE or pixel phase resolution my grid pattern is a bit fuzzy.. Im thinking its more of a phosfor thing, as on the resolution benefit from slightly softer focus scattering some of the beam, so the phosfor dont get hit so hard/ bright, at one spot. Now im evaluating at max light output at 14-20fl on a neutral gain 90" screen, so no turning down contrast, or dim CRT image.
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Post by Casethecorvetteman on Feb 8, 2017 22:33:47 GMT -5
I use the NEC readability pattern, and i defocus to 0, then set optical for sharpest grain on screen with the right click menu showing so i know where middle is.
Then i set electronic to 57 as per the 909 tube install TSB, and move yoke til best sharpness at 1920x1080p. Then walk to the screen, move focus back and forward to be sure it is set spot on best.
If i set brightness to about 10 and contrast to 95-99 it is a touch easier, but makes no difference to the final result.
On the NECs i used to set focus to +10 ( or -10, cant remember which, goes from -100 to +100 ) then adjust the pot til best sharpness, and i used to use the internal H pattern at 640x480 or 800x600. The Barco doesnt have a pot, and adjusting electronic focus varies on each scanrate, where it makes no difference on an NEC.
Setting lenses i always use the full defocus and go for sharpest phosphor grain.
Image sharpness relating to electronic focus doesnt seem to vary with different patterns on a Barco or NEC.
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Post by Casethecorvetteman on Feb 8, 2017 22:35:16 GMT -5
In relation to the phosphor grain focus method, i dont do that with my Sony VPH-1001 QMs, because Delta TAC-4 lenses are just not that capable.
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Post by stridsvognen on Feb 9, 2017 7:55:02 GMT -5
If you display the pixel phase pattern from the DVE disc, can you clearly see the 1:1 diagonal pixels on screen.?, and if that well resolved, hows the geometry pattern, white lines on black background from the DVE disc.? Im curious about those 2 specifik patterns as i can reference to those, not so much how you get there, just how they look, ill snap a few pics when i get my 9518 up hanging. Important is to know the light output on what type and size screen, as CRT focus is very much depending on how hard its driven. The images is both from a Marquee 9518   |
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Post by gregstv on Feb 10, 2017 22:00:59 GMT -5
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Post by gregstv on Feb 10, 2017 22:03:48 GMT -5
I will do some shots with all HFA100's changed to AD8009.
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nashou
Unmoderated Off Topic
Tech in Training.....
Posts: 1,239 
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Post by nashou on Mar 2, 2017 17:37:32 GMT -5
Ive tried the AD800x and the OPA695. The 695 works best but I only did this on the Vim's You need to play with the FB resters, get a bunch of values to test, the gain of the recommended ones for the gain we need makes it a bit too bright. its been a few years since I did this so I cont remember what I used and I was using the same vim for all this and its back to stock when I decided to try the adjustable Black level mod we talked about some where using the volume control for adding voltage . Been working with Vintage Audio gear lately guys so Have been out of the video loop for awhile . Miss it to be honest. I haven't watched a movie in over 5 months I think in the theater.  maybe some day I'll get back to playing with all this again. Nashou |
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Post by gregstv on Mar 3, 2017 6:09:47 GMT -5
Ive tried the AD800x and the OPA695. The 695 works best but I only did this on the Vim's You need to play with the FB resters, get a bunch of values to test, the gain of the recommended ones for the gain we need makes it a bit too bright. its been a few years since I did this so I cont remember what I used and I was using the same vim for all this and its back to stock when I decided to try the adjustable Black level mod we talked about some where using the volume control for adding voltage . Been working with Vintage Audio gear lately guys so Have been out of the video loop for awhile . Miss it to be honest. I haven't watched a movie in over 5 months I think in the theater. maybe some day I'll get back to playing with all this again. Nashou In what way did you find the 695 better? The AD8009 looks really nice and clean in the Barco. |
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nashou
Unmoderated Off Topic
Tech in Training.....
Posts: 1,239
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Post by nashou on Mar 3, 2017 17:17:00 GMT -5
695 was sharper. I didn't look closely to the noise tho on either, at that point I was just looking for resolution ability on an 8 inch tubed marquee. But in the end I use the EL5166 . Just easier to adapt to the marquee. I began to loose patients back then chasing oscillations and working with those small resistor parts.  Nashou |
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Post by gregstv on Mar 3, 2017 17:39:44 GMT -5
I do all soldering under a microscope these days. I have not looked at the Marquee video circuit at all. The 8009 was an easy fit into the Barco circuit. Now it's cooling down I can get back into the shed and start playing again. At this stage it's the Sony 1292 I will looking at improving.
Not sure if I need to go any further with the Barco as it looks razor sharp and silky smooth.
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Post by gjaky on May 19, 2017 11:26:17 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
I've added an extra colum to this great list with showing the value for the optimal feedback resistance at gain 1 or 2. When playing with CF opamps one should always keep in mind to follow those values as was previously mentioned. I've now experimenting with the LMH6703 in the ULTIMATE VNB-DB, so far the results are better then it was with the CLC449. OP Overview_JG.xlsx (10.57 KB) |
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