CurtPalme.com Home Theater Forum

[Joust]

No not at all.
there are are in fact more wires on the Marquee yoke harness than are connected on the sony yokes.

[barcoguy]

OK i got it but they work but are out of focus. whats the trick?

[stefuel]

I thought I'd bump this up to the front page as there seems to be some other Marquee focus threads going on now. I started reading the first couple of posts when I noticed that all the pictures are gone. What happened?

[Nashou66]

[stefuel]

And the really nice thing about a AmPro 4600HD is it comes stock with the parts you are trying to fudge onto a Marquee.

[Nashou66]

I think that focus coil is in all ampros from the 3600 and 4200 and up. Not sure though. some dont have one of the windings as in the pic i have on here from the coils TSE sent me.

Athanasios

PS i dont feel like replying toy our playful banter

[stefuel]

Who's playing

[Nashou66]

Here is some info i copied from ZGman on AVS to post here:

[zGman]

Ok, you are very quick!!
Thanks,
G

[J Kildare]

Does anyone have pics of the wiring harness after the mods have been done? All of Chris's pics have been gone for some time now, and not sure if he still has them or not. I now have a set of these (22-22) and would like to modify the wiring as required but have no real pics or schematic.
Jim

[Ohmess]

I have a question for the Frankenyoke folks. In looking for the parts to do this mod to a set of Marquee tubes, what exactly would one look for? From this thread, it appears the parts are Kanto Denshi K22-22s, and that these were used in the Sony 1292. It also appears that Sony used part # 1-452-811-11 for this part.

Is this the only yoke that will work? Did other manufacturers use this same yoke (with a a different part number)? Has anyone use other yokes to upgrade a Marquee?

[Nashou66]

Nope just that. look for the long number on sony parts.

Athanasios

[Ohmess]

Been looking around for a couple of months; no joy. Thanks for the confirmation.

[Nashou66]

Well i made some progress on rewinding the focus coils of a barco(not sure which one) IIRC it was a KF3203 G, I posted a pic of it and of the grid it threw with no connection, From that pic TSE said it might work. So with that little bit of encouragement i decided to try it. I first got some 32 gauge magnet wire and tried to do it by hand but it looked uneven and I did not want to try it. So this sat on the back burner for a long time. Then I found a hand crank traversing coil winder on the bay and bought it. Still i never got around to using it. Well a couple weeks ago i decided to try to rewind the static bobbin coil, after it looked much nicer than my hand wound turd. So i was going to wait on some 24 gauge magnet wire to rewind the dynamic as well, but decided to try it with the stock Barco dynamic coil value.
My values are off and I think if i get closet to the Thompson values exactly i will have better results.

The Thompson stock value for the static is about 30mH and the dynamic is 45uH. I over wound it a bit so I could see what higher value will do and if need be unwind some to the correct value for the magnet structure and or the focus circuits. The static value ended up at 36m and the stock value of the barco dynamic was 69.8uH after the wiring harness was connected t was like 58uH before, maybe the wire added some inductance?
TSE described the values of inductance each focus circiut would work with on the marquee and both fell into that
range.

I did not hook up the Astig coils yet that will be next, and that might be what i need to fix things you wil see
in the pics.

I hope TSE chimes in here with some advice. One thing i noticed is i wasn't sure how the original coil wind began and on what side. Scott(TSE) said it shouldn't matter and if i noticed anything just switch the wires in the harness near the focus board. At first i got nice tight focus in the centers and across the horizontal but upper and lower were not as good.
I also had to go very low for good focus like to 14. So i decided to swap the wires in the harness, now I got a litlte better results and now had to go up for better focus to 74. Edges on corners were not as good yet.
so then i swapped wires for dynamic also. this is where i stopped since its 2 am here now :shock)

So Scott would lowering the value for both help. I now if I lower the static i will have more range of the focus numbers
so i will unwind till i get close to 30mH. and I thing it would help when i rewind the dynamic also or unwind some there.
I ordered 24 gauge magnet wire for that.

Also will the astig winding once hooked up help the corners. Oh and these pics are with no CPC magnets on the tubes
and I did not correct the deflection coil either.

8 inch AC tube with Frankenyoke Mrk III(Barco Rewind: Barkenyoke?)

EDIT: looking at these pics the fuzz around parts of the grid is juts finger prints on the glass.





Athanasios

[Ohmess]

Dude -- you went out and figured out that in order to get a better wind you needed something called a hand crank traversing coil winder to play with the Barco KF-3203 KOK21s you took apart a few months ago just to see if your idea about modifying the Barco parts might work, found one on ebay, bought it, used it, and are now making progress on this crazy idea. You are seriously addicted.

Keep up the good work.

[Nashou66]

[Nashou66]

Someone either PM'ed me or in another thread said he'd send me some barco cols for the cause. If you have any Id like them and see what i can do from scratch now that this is all fresh in my head. The last two assemblies i had i mixed up coils and such so I just want to confirm with a known stock coil assembly. I am 95% sure I can make this work
with barco coils now. I just need the fine tuning of the corners and T,B,Side focus could get a bit tighter. Its hard to judge from only the tube face, but 70-90%of the grid is very very sharp. I need to have a set in a set up PJ to really get a feel for what is going on the tube face by transferring it to the screen.

I was thinking that winding your own coils you can "match" focus assemblies better to each other, but this isnt really too important as you can go into the individual focus sections and tighten it up...Ahhh Haaaaa!!! I should go into the zone focus and see if I can tighten up the sides and top bottom.!!!! Its just a pain to maneuver through the menu on a reversed menu.

EDIT: Just went into the service menu adjusting section and tightened up the sides and top and bottom. Awesome!!!!!! the one side could use some more adjustment and this is where a closer speced wind I think would come in to play.

Id love to make a set of Barcenyokes for each tube and then see the difference.

Athanasios

[Ohmess]

Can you be more specific about what you are seeking please?

[Nashou66]

[Nashou66]

Ok Via PM I asked TSE about my findings and he gave me some things to look for . I Just went to my test machine and its 8 inch tube i have resting on top as the focus coil
test tube. From now on in this thread I will refer to a non connected focus coil as a "dead" coil. So I slid on a dead Thompson coil, it was very focused in the center and even the edges, I then used the Barco dead coil and it was out of focus evenly through out the grid I now tested a Sony dead coil and expected better results than the Barco but it was the same, maybe a bit less unfocused but it was so slight I couldn't tell and went back and forth between each just to make sure, it may have been due to the Sony coils lack of a clamp flange on the end nearest the convergence yoke. I think if I can get them closer to the convergence yoke they may tighten up more. This can be done I think by using a sanding drum a bit smaller than the inside of the focus coils and reaming out the very end so the clamp of the convergence yoke fits inside the Focus coil. I think Galen did this and found the Frankenyokes Mrk II were able to have a better focus range using the controls. So i think a rewind of Even the Frankenyoke Mrk II's(KD-2222) to the specs of the Thompson yokes static winding could give better results. I may try this with a spare Mrk II yoke I have. I think the Dynamic may also benefit too as TSE said this is a resonant circuit and would be affected more by the windings not being of the right value where as the static is a linear circuit.

As you can see here from some readings taken by Nuttall Chris the static inductance of the Thompson is twice as much
as the static inductance of the Sony 1292 yoke. the dynamic is much closer with only 5 uH difference.

Thompson from an 8500
Black – Red Static Focus 29.9mH 58.5 ohms
Yellow – Org Dynamic Focus 45.6uH 0.38ohms
White – Violet Astig Winding 156uH 6.2ohms
Grey – Blue Astig Winding 156uH 6.2ohms

Thompson from an 8000
Black – Red Static Focus 28.7mH 58.5 ohms
Yellow – Org Dynamic Focus 45.6uH 0.38ohms

Sony KEO23 sony # 1-452-811-11 From a 1292 (22-22 ??) Tested as a Frankenyoke
Pin #
2-4 Astig Winding 52.6uH 3.494ohms
3-5 Static Focus 14.9mH 56ohm
6-8 Astig Winding 52.4uH 3.5ohms
7-9 Dynamic Focus 40uH 0.29ohms

Sony K2211 from ??
Pin #
1-2 Static Focus 25mH 69ohms
3-4 Dynamic Focus 51uH 0.22ohms

Barco KF-3205 KPK14 From a Barco 808s
Pin #
2-4 53.6uH 3.3ohms
3-5 294u H 0.95ohm
6-8 53.6uH 3.3ohms
7-9 294u H 0.95ohm

The values I measured on my KF3203 for the astigs were 116uH in between the values of the Thompsons 156uH and the sony's 52.6uH. On this
I do not know what the difference will make an await TSE's reply or maybe he'll answer here.

I cant believe I waited this long to follow through on this. I was almost not going to after I found two sets of sony coils.

Athanasios