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Barco Streaking Survey - Page 3

post #61 of 276
Thread Starter 
Gary you must have a different version than I have because I have much better DVDs. But Magnum force really does show the streaking, I find.
Also in adjusting the G2 should I be using the three pots behind the drive boards as opposed to the G2 pots right on the drive boards. And do I need a voltmeter to adjust it properly?

Regards
post #62 of 276
Thread Starter 
Sorry Gary , missed saying thanks for all that info.

Secstate, where in the UK. are you getting your stuff? I will place an order as well.

Regards
post #63 of 276
BG800

1064x764 48khz

1992 i think

don't know hours

CRT condition are 9s

I use TT1.5 for DVD, Samsung 165 OTA HD receiver

normally brightness is @ 90 in projector and contrast is 45. In TT 1.5 brightness is usually 10-20.

I just started streaking 1 month ago and I don't mean running around in public sans clothing.

Is it time to give up the 800 and go to digital? I hope not.
post #64 of 276
BG 801, nearly 42000 hours (and still running!) tubes are all in nearly pristine condition (must have been re-tubed shortly before I bought it . . .)

720p@60Hz. No streaking whatsoever.

As for source material, I imagine that the angled text scroll in the beginnning of Star Wars would be terrible.
post #65 of 276
Quote:


Originally posted by Tully
Sorry Gary , missed saying thanks for all that info.

Secstate, where in the UK. are you getting your stuff? I will place an order as well.

Regards

www.crtprojectors.co.uk. I have no affiliation with the company but they do have good reputation. The upgrade was about $75.00 when I inquired about 5 months ago but is probably closer to $100 these days with the decline of the $ vs. the Pound (and everything else).
post #66 of 276
For the G2 adjustment you are supposed to use the three pots on the G2/Diagnotic board in the back of the projector with the other boards (it is the one with all the LEDs). The pots on the amp boards themselves are not part of the normal G2 adjustment.
post #67 of 276
Thread Starter 
Thanks Secstate. So can you run me through the proper way to adjust the G2 , maybe I'm doing it wrong, and it amplifies my streaking problem.

Regards
post #68 of 276
Your welcome guys, Henry who gave me that info is from crtprojectors.co.uk

-Gary
post #69 of 276
Check the H phase, adjust it up and down, its possible that its set to high or too low.
post #70 of 276
Thread Starter 
I emailed Uk projectors today and Henry told me" It's possible that R762746 120Mhz RGB amps from MEC tubed simulation projectors might solve the problem on the Graphics 808 non S."
HHHMMMM may be a cure.

Regards
post #71 of 276
Quote:


Originally posted by Tully
I emailed Uk projectors today and Henry told me" It's possible that R762746 120Mhz RGB amps from MEC tubed simulation projectors might solve the problem on the Graphics 808 non S."
HHHMMMM may be a cure.

Regards

That would be a GREAT news!
And not only for the streaking-affected people...
post #72 of 276
Thread Starter 
I'm still waiting for Henry's reply . He's checking his stock on the amps. But this would be very good if it cured the problem.

Regards
post #73 of 276
BG808 1996

4700 hours, all tubes about 8

5m of standart grade BNC cable

neither it or I steak :-)
post #74 of 276
Bad thing is that black FET (if Henry mean VPH-06) are rare and cost very much. I try to find VPH-06 some time ago and those were only available from barco and cost about 200 $ each.

Red ball show VPH-06 position, in picture is old metal cover model. Newer model have black plastic cover.
LL
post #75 of 276
Thread Starter 
Henry had the RGB amps but the cost would be about $1000 Canadian by the time I got them in from th UK. Maybe somone has them on this side of the big pond . Any one have any idea?

Regards
post #76 of 276
Good, Bad, I'm the guy with the gum.

[IMG]http://www.**************.com/Barco/******.jpg[/IMG]

Remind you of anyone?
post #77 of 276
I forgot about this thread, but I finally got my G808, I think it's a 94, with 11K hours on the chassis. It has some streaking, unfortunately, which is dissappointing moving from a streak-free Marquee 8500.

I'll suck it up and live with it, not very noticeable at all in most video, however it would be something that would be nice to eliminate.
post #78 of 276
Thread Starter 
Well hopefully we all can get a handle on this streaking problem and get a fix for it , one that doesn't require us to change our projectors that would be a bummer.
I emailed Projection Systems to check out there stock of the RGB amps , I'm still waiting for them to get back to me . But if I can get my hands on one I will give it a try and we may have a cure. The problem is , is that these RGB amps are rare and a little pricey.

Regards
post #79 of 276
Quote:


Originally posted by Z-Photo
Yikes,

It would be cheaper to buy a 1208.

Pete

Yeah but you would need a later version with MEC tubes. The earlier 1208 with MEC tubes would require some mods to the connections to take a 1208 or 1208/2 RGB amp. Also the earlier model had big black box RGB boards which I am not sure would fit in the more crowded 808. Basically you would be looking for a 1208s/2 to part out. I don't think you are likely to find the parts by themselves. You probably have to look for a parts chasis. The last one I saw with very toasty tubes went for about $1000. Of course you could sell off the other parts to make some (maybe most of) your money back. Unfortunately 1208s/2 are fairly rare and folks are willing to pay money to get the upgraded features over the earlier models.
post #80 of 276
Also one other possible source is a Barco 808 Retrographics (the rear projection version of the 808). According to the Barco CRT History spreadsheet it uses the same part number. You might be able to find one with a busted screen and worn out tubes for a fair price, but again they are fairly rare so you might be looking for a while to find one at a decent price.
post #81 of 276
Good, Bad, I'm the guy with the gum.

[IMG]http://www.**************.com/Barco/******.jpg[/IMG]

Remind you of anyone?
post #82 of 276
Yeah just under a 1k seems to be the value of a surplus 1208s/2. They would make a very mean machine with new p16s. I may try that upgrade myself one day if I can find one for a decent price. There have been a fair number of 808 Retros these days but most have gone for more than I would have paid and one has been listed on ebay for 999.99 about 8 times. What has kept me from bidding on one is the weight and that fact that I would have to rent a truck to haul one. Only the ones minus the screen appear to go for "parts machine" prices.
post #83 of 276
Thread Starter 
Hi Secstate, your talking about the rgb amps with this part number right? R762746 . There in the Retro Graphics machines as well?

Regards
post #84 of 276
Quote:


Originally posted by Tully
Hi Secstate, your talking about the rgb amps with this part number right? R762746 . There in the Retro Graphics machines as well?

Regards

Yes I am talking that part number. According to the Barco CRT History spreadsheet the Barco Retrographics 808 uses that board as well as the 1208s/2. I have never worked on a Retro 808 so cannot confirm but the Barco spreadsheets are usually accurate in my experience.

I also find it interesting that Barco chose to put a higher bandwidth RGB amp into the Retro which has a limited screen size than the front projector models (excepting the Graphics 808s).
post #85 of 276
Thread Starter 
Yes Secstate Im trying to get a hold of a few of these things so I can give it a try . They replace the neckboard and the amp as far as I know .

Regards
post #86 of 276
Quote:


Originally posted by Tully
Yes Secstate Im trying to get a hold of a few of these things so I can give it a try . They replace the neckboard and the amp as far as I know .

Regards

Yep they are one piece rather than two seperate pieces in the regular 808 units. I am sure you can find some, it may just take a while.
post #87 of 276
I test once R762746 to my 801s, but unfortunately it was from retro and leaked glycol was shortened it. So I don`t know how much it helps.

R762746 have jumper that should move to other position when used instead of R762745.

Circuit board have printed instructions.

The G2 voltages will have to be recalibrated for the replacement board, each one is slightly different.
post #88 of 276
Thread Starter 
"Ile I test once R762746 to my 801s, but unfortunately it was from retro and leaked glycol was shortened it. So I don`t know how much helps.

R762746 have jumper that should move to other position when used instead of R762745.

Circuit board have printed instructions.

The G2 voltages will have to be recalibrated for the replacement board, each one is slightly different "


Thanks for the info , now all I have to do is find one .

Regards
post #89 of 276
Someone can help me with the R672757 and or R762757-5 neck board drawing? (BD 708)
Working to understand the solution BARCO implemented on these machines to avoid the streaking.


Cheers,
Flo
post #90 of 276
I'd like someone to clarify exactly what streaking or degree of streaking is being referred to here? I have now checked 2 BG-808's that I have installed new oem tubes in and completely adjusted and checked the entire projector. Neither projector has any streaking that I would call a problem or be concerned about. The ONLY way anything can be seen, and then it's very faint, is if the brightness is brought up enough to lite the entire raster well above any "normal" settings. Under those conditions, on transitions from black to white, or high contrast to low contrast, on boxes or heavy straight vertical lines, I can see the faintest ghosting or streaking.
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