CurtPalme.com Home Theater Forum

9kids · Joined: 25 Jun 2007 Posts: 138 Location: Manassas, VA

Athansios (Nacho66)

Did you ever get a chance to do any more with the Barco KAF3203 KOK21 focus coils? From your pics it looks like the magnets were about right. Were you going to try to rewind the coils?

When you talked about finding a vendor to make custom focus coil parts, it made me do a few google searchs just to see what was out there. I did not find anything that look promising, but I did find this link that has a good description of all the parts that make a CRT work. This company makes high-resolution digital film imaging solutions (basically a very high rez CRT, projecting a image on to film). I thought the Paper was very good, it is quite a bit above the basics but not so technical that I couldn't understand it. There is a part that describes how they align their focus coils that I thought was very interesting.

The Link to the CRT paper:
ELECTRON OPTICAL TECHNIQUES FOR AN ULTRA HIGH RESOLUTION COLOR FILM RECORDER

Celco's research type WEB site:
http://celco-nj.com/

Celco's product type WEB site:
http://celco.com/

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

**AnalogRocks** · Posted: Tue Feb 05, 2008 3:22 am Post subject:

mhalsan · Joined: 09 Nov 2007 Posts: 146 Location: Astoria, Oregon

Regarding the potential improvement of focus ability as the focus coil is moved closer to the bell; has anyone removed the "hoseclamp" and plastic ears from the convergence yoke, and hot-glued the focus coil to it? That would get the focus coil about 3/8" further ahead.

On my setup, the focus on the edges and corners could be better- and the dynamic RGB focus is at 0 or 100; not quite enough adjustment range.

Thanks, Mark

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

does anyone have a simplified diagram of what wire goes where for the 14-52811-11 I would like to make sure i have it right I kept the sony 1292 harness and would like to make sure what pin on the sony connector to what pin on the marquee connectors
Thanks JOhn

Joust · Posted: Sun May 18, 2008 12:30 pm Post subject:

yeah, I put pictures on page 8 of this very thread.
https://www.curtpalme.com/forum_archived/viewtopic.php@t=2498.html

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

so to be clear the pin number in the chart goes to the number on the sony harness my harness has different wire colors than you show. this is why I would like a clear discription (ie pin one on focus harness goes to pin 4 on sony harness. with pics to show the pin assignments

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

also what are the remaining 2 wires for on the marquee focus harness?

Joust · Posted: Sun May 18, 2008 6:00 pm Post subject:

the colour difference is because I used a Barco harness.
the extra 2 wires are for the temperature compensation thermister thats in the thompson yokes but not in the DKs

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

so its number to number on the chart provided and ignore the colors - correct?

Joust · Posted: Sun May 18, 2008 7:38 pm Post subject:

yeah,
I did a newer one with the proper colours but i might not have uploaded it.
sony has two of all the colours which is confusing.

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

cool, thank you! I got it working.

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

after doing the mod i now have noise in the video chain Wtf if i unplug the yokes it goes away. i don't get it there is even cross talk between the red green and blue
what a pain in the ass has anyone else had this problem

Joust · Posted: Mon May 19, 2008 1:47 am Post subject:

do you have the ground wire tied to a chassis point?

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

yes and i have tried with it removed. no luck

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

I wonder if its not connected inside the coil, is it on all three or just one? Disconnect one at a time till the noise goes away. What do you mean by "cross talk" explain a bit....

Athanasios

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

if i unplug the green coil it seems to be better but that does not seem to be the main cause. What i mean by cross talk is when i am displaying the menu for instance usually it only shows green well on the blue and red tube i get the menu image showing up on them. I have tried swapping neck cards and the vim and still no luck. if i unplug all of the yokes i no longer get it but there seems to be some noise in the picture when you look into the tube.
this all happened after the yoke mod. that is why i am at a loss.
nothing else has changed.

Joust · Posted: Mon May 19, 2008 1:35 pm Post subject:

that is odd.
Each yoke has its own seperate cables so there should be no intermix of signals. you can botch the individual coils on one plug but you'd have to really work hard to intermix the different tube signals.

pull out the ohm meter and compair resistance readings with a thompson yoke.
then try plugging in a thompson yoke to see if you get similar results.

maybe you have astig signals driving a focus yoke and making a HUGE magnetic field that is affecting adjacent tubes.
my only theory.

voodoo7869 · Joined: 19 Oct 2007 Posts: 193 Location: Chicago, IL USA

I will try it thanks for the advice

barcoguy · Joined: 05 Feb 2008 Posts: 128