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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Thu Sep 19, 2013 2:12 am Post subject: To Mod or not to Mod that is the question- Barco 808G |
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I have a set of 120 mhz amps/neckboards R762721 (VPH08 amps) and Sony tubes from an 808S. I was planning on retrofitting them in my Barco 808 graphics. I understand I need to swap out the SMPS and mounts from the 808S.
I've read on AVSForum that installing the 120 mhz amps/neckboards from the 808S to panasonic tubes helps dramatically... although I'm not sure if I have the correct panasonic tubes.
http://www.avforums.com/forums/projectors/28995-light-streaks-dark-scenes.html
Is either these mods worth the effort? The latter seams like it could be easier as I don't think I would need to adjust the tube magnetics which I have no experience. I can solder the 120 mhz neckboards to change the pinout if needed.
Currently, I'm outputting 1080i from my computer and bluray to an HDFURY. Thanks in advance for the guidance.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Thu Sep 19, 2013 4:34 am Post subject: |
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Check out the Eisemann mods for Barcos before you do too much more 
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Thu Sep 19, 2013 2:27 pm Post subject: |
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Thanks for the suggestion. I'm somewhat familiar with Eisemann mods but I'm not really looking to invest much more into the project. I would prefer to use what I have if it offers any significant improvement. My main question is if the mods proposed will be significant enough for the effort involved.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Thu Sep 19, 2013 6:56 pm Post subject: |
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Hi,
The 808 (without "s") has about the same video chain as the BG801s. Both are using the same video amps. I once tried using the 120MHz amps from a BG808s in my BG801s and they worked. Problem was that I got visible streaking and ringing and couldn't see any improvement in sharpness or detail (due to the ES focus in the 801s). So I swapped back to original. You could get better results as the 808 has EM focusing. Don't know if You'll experience ringing though. Just try it out...
Regards,
barclay66
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Thu Sep 19, 2013 7:58 pm Post subject: |
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What tubes are in your BG801s? Is the pinout for the sony tubes on the 808S the same as the 808G panasonic tubes?
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Thu Sep 19, 2013 8:55 pm Post subject: |
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| barclay66 wrote: | Hi,
The 808 (without "s") has about the same video chain as the BG801s. Both are using the same video amps. I once tried using the 120MHz amps from a BG808s in my BG801s and they worked. Problem was that I got visible streaking and ringing and couldn't see any improvement in sharpness or detail (due to the ES focus in the 801s). So I swapped back to original. You could get better results as the 808 has EM focusing. Don't know if You'll experience ringing though. Just try it out...
Regards,
barclay66 |
One of my friends has a BG808 (non 's', with retrofitted Panasonic P16 LC tubes), and he has both 75MHz and 120MHz neckboards but he gets various problems when changing the newer RGB driver and neck boards to the plain BG808 (he gets no picture and, I2C errors mostly). So maybe that could be also an issue.
Others also reported no- to minimal sharpness improvement with the higher bandwidth neckboards.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Thu Sep 19, 2013 9:44 pm Post subject: |
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| gjaky wrote: |
One of my friends has a BG808 (non 's', with retrofitted Panasonic P16 LC tubes), and he has both 75MHz and 120MHz neckboards but he gets various problems when changing the newer RGB driver and neck boards to the plain BG808 (he gets no picture and, I2C errors mostly). So maybe that could be also an issue.
Others also reported no- to minimal sharpness improvement with the higher bandwidth neckboards. |
For BG808 ---> BG808s must change RGB Driver board and RGB Input also (R762719+R762120).
Also the firmware must be upgraded.
I has no problem with conversion of these projectors.
A good improvement is possible with P16 LC tubes (and lenses) but is necessary mount DIY supports.
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Domenico (Barco fan!)
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Sep 19, 2013 9:55 pm Post subject: |
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| moto-man wrote: | | What tubes are in your BG801s? Is the pinout for the sony tubes on the 808S the same as the 808G panasonic tubes? |
Panasonic and Sony tubes have different pin out you would need the right neck board for the particular tube.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Sep 20, 2013 6:30 am Post subject: |
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| moto-man wrote: | | What tubes are in your BG801s? Is the pinout for the sony tubes on the 808S the same as the 808G panasonic tubes? |
Hi,
Pinout was different (BG801s uses 07 MSP tubes) and the tubes needed a focus connector. So I took the CRT sockets from a set of spare BG801s neck boards and soldered those onto the RGB amps...
Regards,
barclay66
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Fri Sep 20, 2013 6:33 am Post subject: Re: To Mod or not to Mod that is the question- Barco 808G |
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| moto-man wrote: | | I can solder the 120 mhz neckboards to change the pinout if needed. |
I've changed pinouts of the Sony's 120Mhz neckboards with success many times
If you want ...
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Domenico (Barco fan!)
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Fri Sep 20, 2013 7:00 am Post subject: |
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Removing ABL from original 75MHz rgb amps helps to streaking. That is maybe easier if you are good with smd electronics.
But if you wan't also bit higher BW, you need go with modded 120MHz amps and s-series input/driver/software.
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Fri Sep 20, 2013 7:12 am Post subject: |
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| Decibel wrote: |
For BG808 ---> BG808s must change RGB Driver board and RGB Input also (R762719+R762120).
Also the firmware must be upgraded.
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I have a BG808 with
Stock boards
a set of eisemann modded boards
Cine 8 firmware + RGB input and driver (s-series)
Both the modded set and S-series give me very similar results, certainly better than the stock boards! (using test patterns)
I wouldn't invest 1000 usd in a set of greg eisemann none-S boards, i'd look for a set of S-boards first.
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Sat Sep 21, 2013 4:59 am Post subject: |
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So based on my initial question which route would offer the best improvement? Installing the Sony tubes and 120 MHz neck boards or leaving the stock 808g panasonic tubes in with modded neck boards? Does either offer a noticeable difference? I want to figure out first if it worth doing the mod. My setup works fine now so it might not be worth the headache if this is going to be marginal improvement. Also I'm not doing this mod to fix streaking. I haven't noticed streaking in my set. I was just hoping to improve the sharpness. Has anyone tried the mod I'm suggesting? I'm not looking to buy p16 since that would be quite expensive. I actually have a set of p16 but unfortunately they are from a 708 data  Thanks for all the feedback so far.
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Sat Sep 21, 2013 8:18 am Post subject: |
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A good improvement can be the replace of the lenses.
You must find a set of HD144/145's and DIY adapters.
It's a upgrade simple, cheap and the improvement will be high.
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Domenico (Barco fan!)
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Sat Sep 21, 2013 2:47 pm Post subject: |
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I already changed the lens out to the HD144. That did help. Now I'm looking to improve it even more if I can with reasonable changes.
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Sat Sep 21, 2013 3:25 pm Post subject: |
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If you don't want to replace the tubes with better P16's AC or LC you can try Darbee Darblet interface
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Domenico (Barco fan!)
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Sat Sep 21, 2013 3:38 pm Post subject: |
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If you have decent sony tubes + amps i'd use those. Seems generally it's 180DVB < Sony tubes < P16 tubes + no effort to do the mods.
And i'd keep an eye out for some S-boards, the RGB driver and input are a real upgrade!
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Sat Sep 21, 2013 3:40 pm Post subject: |
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Decibel, so you think changing to Sony tubes with 120 MHz neck boards or just adding 120 MHz neck boards to the stock tubes don't offer any significant improvement? Does it help if I change out the rgb input and driver board?
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moto-man
Joined: 19 Sep 2013
Posts: 20
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| Posted: Sat Sep 21, 2013 3:43 pm Post subject: |
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Just saw your comments frag zero. Are the rgb driver input and driver compatible with all tubes and amps?
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fragzero
Joined: 30 Aug 2012
Posts: 344
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| Posted: Sat Sep 21, 2013 5:19 pm Post subject: |
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| moto-man wrote: | | Just saw your comments frag zero. Are the rgb driver input and driver compatible with all tubes and amps? |
Well i have 180dvb's with s-boards and 75mhz amps,and i have combined a lot of boards, nearly everything worked, just be certain to use the correct firmware.
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