CurtPalme.com Home Theater Forum

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

listen closely to the ceramic caps on the vdm, they make that noise.
maybe on some other boards too.

http://www.murata.com/en-global/products/capacitor/mlcc/solution/naki

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Indeed the peeeep comes from vertical and lvps. Think I forget about it. With the vision cage it might be unaudible.

One question. The tubes are new. Should I do some setup and project all white with low contrast for some time?

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

Set up the PJ unfocused with a full white field at 40 contrast for a few hours a day if your anal. I did it for 8 hours while At work and that was it.

Athanasios

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

Yep the piezoelectric effect.

http://www.atceramics.com/Userfiles/piezoelectric_effect.pdf

Film caps may help if there is room .

Nashou

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

A little impression of the beeeeep. It gets less with a full screen. I think it is pretty quiet this way.

https://www.youtube.com/watch?v=rx-4RuzHZ6k&spfreload=10

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

I am working on the magnets and discovered that with the focus yoke wires disconnected the blue focus yoke all the way to the tube bell I still don't have optimal focus. I have to set electronic focus at 37 to get it sharp. At 50 there is overfocus. The RGB focus is also on 50. The green and the red tubes are new and they focus sharp at 50.

Now it seems to me that the old blue focus yoke has lost some of its permanent magnetic power? Is it normal for a marquee to have 10 point underfocus electronically? Is it advisable to try other focus yokes?

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

Yes its normal. That is why they have the individual RGB focus adjustments. The magnets never can be exactly the same and stay the same over time. So an electromagnetic field is needed to compensate or under compensate the Gauss of the magnets.

Also your electronic focus will differ as well due to non matching components of each RGB circuit on the FCM/FGM.

Athanasios

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

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

That could be it.

here are some relevant threads.

https://www.curtpalme.com/forum_archived/viewtopic.php@t=15724.html

This device was posted in the MArquee Mod thread and Scott started a new one dedicated to it.

http://www.curtpalme.com/forum/viewtopic.php?p=152532&highlight=#152532

There are some more all over this forum about the focus of the marquee, and in the frankenyoke thread.

I have some things I want to try on that board as well soon.........

Athanasios

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Very cool but such a big toroid I do not have laying around Very Happy

I feel like testing different yokes like the 1292 and the barco yokes and more thomson yokes I have here.

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

I tried another Thomson yoke I have here and found out that the convergence yoke could be moved a little over the deflection yoke. Do not know if that solved it but now at 50 the yoke seems to be in focus. It is different with the barco's there you have some space to move the yokes.

This way I have more headroom for focus in the corners.

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

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Ok. By the way I am doing the magnets now with the lenses off. Contrast at 70 it is clearly visible. Especially blue seems easier this way. I guess on screen I can fine tune.

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

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

Some strange observation. When the Marquee is in standby I can see the blue tube filament glow clearly but the other two are very faint. Does the filament get brighter with hours? Or do new tubes have different filaments? Just curious.

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

gjaky · Joined: 05 Jun 2010 Posts: 2802 Location: Budapest, Hungary

redfox001 · Joined: 16 Mar 2009 Posts: 2257 Location: The Netherlands

It was visible when I removed the back covers of the neckboards. It can be seen between the cooling ribs.

Another weird observation. i was not totally happy with the factory settings of the magnetics and on the green tube these astig magnets where difficult to turn without a knob. So I put on a new set of magnets and before I nulled all magnets. When I fired up the blobs seemed perfect round, dots in the middle and no movement with focus! Very Happy

So I thaught hey lets do that for red too but sadly that did not work for red or blue Sad

Makes me wonder again why does the green not need any correction? Is the gun perfect in spot?

gjaky · Joined: 05 Jun 2010 Posts: 2802 Location: Budapest, Hungary

I think it depends on pure luck, if you move the pj away, or put it upside-down you most likely have to redo the Astig, it is very delicate.

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

The placement to the earths magnetic field has a lot to do with the CPC magnets. Just moving from floor to ceiling sometimes throws it off and it has to be redone .

Athanasios