CurtPalme.com Home Theater Forum

Chuchuf · Joined: 11 Mar 2006 Posts: 548

Nice project Ile. Very nice.

Terry

jask · Joined: 17 Mar 2006 Posts: 10165 Location: kamloops BC

looks good Ile!! I am doing a similar ceiling mount. I found a great fan for the project in an appliance shop! the extractor fan from a Jenn-air downdraft range-with a rheostat from the cooking element for speed control.I will eventually use a thermistor to control this fan.

Ile · Posted: Wed Apr 02, 2008 7:53 pm Post subject:

I'm going to use Barcos own back fans to blow hot air from hushbox. Long throw makes it possible, because projector is going to be only feet or so from back wall. I probably going to use two or three 120 mm Barco NMB's to blow fresh air to hushbox front section. I'm going to take fresh air from another room floor level, so it's going to be as cold as possible.

I'm just building attachment hardware for tube rack and already painted few aluminium frame parts black. It's going to have similar black industrial look what this sucker. Shocked

http://www.barco.com/projection_systems/images/BR912_l.jpg

No similar scoop of cource. Very Happy

Ile · Posted: Wed Apr 09, 2008 7:49 am Post subject:

Got projector build up last night.

After start rasters was super bright and retrace lines was visible, I almost got heart attack...
But just G2 needed to turn down almost full turn, after that everything seem to be ok. When I tested neck boards with Jarmos (1031) test tube G2 looked ok as is, so that tube must have very low emission.

Heater voltage seems bit high (6.6 V) with adjustments meant for Sony tubes, so I'm going to drop it to 6.3 V today. No PQ impressions yet, but few pictures...

Yes it looks bit bulky, but that only makes me build hushbox faster. Very Happy

Mark_A_W · Posted: Wed Apr 09, 2008 9:21 am Post subject:

Looks AWESOME!!

DIY projector Porn!!!

Does it have flapping Ile?

And are they the 120mhz neckboards?

1031 · Joined: 22 Mar 2006 Posts: 657 Location: Finland

Yes, Looks NICE Thumbs Up

Not really beaty queen, allmoust as ugly, as marquee Mr. Green

Edit. Yes your Diy Barco is much nicer looking that naked Marquee

Ile · Posted: Wed Apr 09, 2008 9:46 am Post subject:

Ile · Posted: Mon Apr 14, 2008 1:52 pm Post subject:

1031 · Joined: 22 Mar 2006 Posts: 657 Location: Finland

Ile · Posted: Mon Apr 14, 2008 8:56 pm Post subject:

RTV was just fine. HV lead soldering to bell connector looked fishy, so I glued another lead.

I forgot to mention that neck board noise mod seem to work, I had only one modded board in projector and it had much less noise than other tubes when I looked through lenses. I make more tests after I get it running again. I hope those ferrite core inductors near tube wont cause any problems with stability. Very Happy

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Ile what value were those Inductors and are they high enough current rated? Aslo you could possibly change out those carbon comp resistors like in the Marquee Neck board mod to Ceramic Ohmite resistors.

Athanasios

Ile · Posted: Mon Apr 14, 2008 10:12 pm Post subject:

Ile · Posted: Fri May 02, 2008 2:03 pm Post subject:

I'm thinking to make convergence tray cooling little better and realized that 808's have two separate temperature controlled fan systems. One sensor in smps that controls back end fans and one in convergence tray. My other Barcos have only one control system. Convergence fan voltage is rising much faster. I have to measure these voltages also after projector have been running hour or so, to see if convergence fan runs much higher.

kaitsu66 · Joined: 03 May 2008 Posts: 9 Location: Finland

Ile · Posted: Mon May 26, 2008 11:13 am Post subject:

In weekend I made holes to back wall and elevated 808 to ceiling. Small hole is used for hot air channel and bigger hole over it for fresh air that is pushed between wall from floor level.

Now I "just" need to make hushbox, new screen and get ceiling and walls bit darker...

Ile · Posted: Wed Aug 06, 2008 1:11 pm Post subject:

Little update.

Box is working great and it's pretty darn quiet. Very Happy

Bookshelf that is coming against back wall should make it even better, then fresh air fan noise through wall should be lower. Shelf under hushbox was reason why I couldn't use hinges for box bottom cover.

It still need paint and I'm going to build rear speakers inside lowered ceiling that is coming to be in same level with hushbox bottom...

Ile · Posted: Wed Aug 06, 2008 1:22 pm Post subject:

Bedroom side of wall is only ready part of my project.

I use two 120x38 mm 80 CFM fans for fresh air, those are feeded from Barco back end fan power lines. Line is feeding fans with only 7.8V, so those are quite silent. Hot air is coming out with Barcos original fans, no extra fans needed in my case.

First I dried air filtering for cooling air, but filter was decreasing too much air flow so I make only gratings for fans and hot air channel. With auto cabin filter fans was needed to run with 13 V and without filter about 8V is enough.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Ile, Looks very nice! Did you line the inside of the hush box with any acoustical foam?

Nice Job on a tough project!!!

Athanasios

Ile · Posted: Wed Aug 06, 2008 2:44 pm Post subject:

stefuel · Posted: Wed Aug 06, 2008 9:04 pm Post subject:

C'mon smiley, we need screen shots Wink