CurtPalme.com Home Theater Forum

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Yes, when taking the magnet structure apart, what I do is I take a permanent marker and draw two lines across the entire assembly in a long V shape. When reassembling,
if the V is not a V, you're doing it wrong.

So now we know the KF-3203G yoke is unsuitable for Marquee applications without
both rewinding of the static focus coil and remagnetization to the appropriate strength.

CJ

Atom · Joined: 09 Mar 2006 Posts: 79 Location: Toronto

I tried a Focus coil in my 9500 yesterday on the green crt. I used the original casing and I flipped the coil 180 degrees so that it had the same Magnetic polarity as the original Marquee coil. So far everything looks good. I didn't have to rotate the deflection coil at all . Included below is a picture with the coil in place. I will be trying the coils on the rest of the crts this week if I can find the time. I'll get back with some more pictures when I have that done.
Andrew

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Be sure that the screws and nuts you're using to hold the two halves of the housing together are NON-MAGNETIC. Stainless steel or brass.

I recommend that you transfer the coils into Marquee yoke housings as it allows you
to position the focus coils closer to the bell of the tube. This will have an effect on
the focusing ability and range. Alternatively, modding the focus housing to the
same end may be advisable.

It's not as easy to come up with a good solution for recasing the Mark II coils as it
is for the Mark 1 coils, but a satisfactory solution is possible.

Atom · Joined: 09 Mar 2006 Posts: 79 Location: Toronto

The screws I am using in the picture are stainless steel , I also have some nylon that I could use. I'll try using the Thomson housing and see if it makes a difference. Here is the patent link for the focus coil if anyone is interested
http://www.freepatentsonline.com/5113162.html?highlight=4975668&s_id=33a3c13003416a6025f777813a8b358c
Andrew

Atom · Joined: 09 Mar 2006 Posts: 79 Location: Toronto

I just had a look at the convergence coil and the focus coil .If you remove the clamp that holds the covergence coil there is a plastic sleeve.The 22-22 focus housing would either fit over the plastic sleeve on the convergence coil or I could remove the plastic sleeve. That would move the focus coil at least 1/4" closer to the bell of the tube. The convergence coil is held in place with glue so it does not look like there would be a problem loosing the clamp.
Andrew

Lyckman · Joined: 09 Nov 2006 Posts: 66 Location: Gothenburg, Sweden

Finally I found some 22-22 yokes, and my 9500 LC Ultra is now equipped with them. Anyone that owns a marquee should do this mod!! We have all seen people complaining that the marquees are dim. Well...Not any more! So what if it eat tubes faster. When that time comes, there will be a digital pj for me that will outperform the Ultra. No doubt. I will do measurements today to determine the increased output. I'm suspecting ~20%.

// Lyckman

**AnalogRocks** · Posted: Wed Feb 28, 2007 5:33 pm Post subject:

Any before and after all important screen shots?

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Lyckman, I thought the Fyokes were supposed to improve focus and sharpness, not increase light output. My 8500 will already pump out 15 ftL or more on an 85" wide screen before it starts to bloom, which is more than I need. I usually run at 12 ftL.

If increased brightness was the only benefit, I'd say "why bother?" unless you're running a really monster screen.

nuttall_chris · Posted: Wed Feb 28, 2007 6:06 pm Post subject:

I did the Frankenyoke upgrade to my 8500 and there is a increase in focusing ability. I can also crank my contrast and brightness alot higher than before the upgrade without blooming. The problem with this upgrade on the 8500AC is the lenses can't resolve the higher resolution. On the tube face there are scan lines at 1080p but on the screen, with HD144 lenses the scan lines are not visible. Some secreen shots of my 8500 at 1080p can be seen at

https://www.curtpalme.com/forum_archived/viewtopic.php@t=3976.html

I will be upgrading my 8500 to LC and better quality lenses. I am hoping the lense upgrade that is required to go to LC will also help bring some of the sharpness from the tube face to the screen.

Chris

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Interesting. I wasn't sure about the HD-8b's but I'm surprised even the HD144's won't show the improvements. That pretty much makes it pointless to do this mod, doesn't it? Unless you're looking for increased contrast without blooming?

nuttall_chris · Posted: Wed Feb 28, 2007 6:52 pm Post subject:

Just to clarify, I did see some improvement. How much is difficult to quantify and is very subjective, but if asked I would estimate ~5%.

Is this upgrade worth it on an 8500AC....hard to say. As I said I will be upgrading to 8500LC in the very near future. I will have both projectors (8500AC HD144 with Frankenyokes and 8500LC with HD10 lenses and stock focus coils) set up at the same time on the same screen. I will update after the upgrade and setup is complete.

Chris.

mrking · Joined: 29 Mar 2006 Posts: 193 Location: Sweden

Cool.

Looking forward to hearing the result of this comparison.

nuttall_chris · Posted: Wed Feb 28, 2007 6:58 pm Post subject:

It will be at least a month before I have finished the upgrade. I am picking up my LC housings next weekend (March 10th), the lenses are currently being shipped, and I will need to fabricate new upper and lower mounting brackets. I will also have to remove my tubes from their AC housings and install them in the LC housings.

Thanks Kal for showing me what a nicly set up LC projector looks like, look at all the work you have created for me. Smile

Chris.

mrking · Joined: 29 Mar 2006 Posts: 193 Location: Sweden

Bah. If you are picking the hardware up next weekend you should be able to have anything finished except the mounting plates by monday. Wink

nuttall_chris · Posted: Wed Feb 28, 2007 7:17 pm Post subject:

The mounting plates are the easy part, its the tube swap from the AC housings to the LC housings that will take some time.

Chris.

mrking · Joined: 29 Mar 2006 Posts: 193 Location: Sweden

That's not hard but boring.

Are the donator LC-chambers still mounted on tubes?

Joust · Posted: Wed Feb 28, 2007 7:43 pm Post subject:

Chris's quest for perfection continues.....I'll help if you want some Chris.

nuttall_chris · Posted: Wed Feb 28, 2007 7:47 pm Post subject:

nuttall_chris · Posted: Wed Feb 28, 2007 7:48 pm Post subject:

Lyckman · Joined: 09 Nov 2006 Posts: 66 Location: Gothenburg, Sweden