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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Sat May 05, 2012 4:59 pm Post subject: wacky beam spot on red in Marquee Ultra |
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So last night I'm getting one of my Ultras back up and running after losing patience trying to get good results with the G90 focus yokes, put the Thomson yokes back in and I run into an issue I don't remember experiencing on the red when setting CPC flare and beam spot shape. With user focus at 0 and contrast at 80+, I wasn't getting the classic big fuzzy circle with the bright spot that you can usually easily maneuver into the center of the halo. Just wouldn't cooperate. And then playing with the stig and triangular correction rings I was getting crazy beam spot shapes, hugely distorted with multiple spikes and comet trails. I had active stig all set to 50, and service mode EM focus set to 50. I am able to get an acceptable grid, so it is watchable. Just couldn't get the beam spot predictably dialed as normal.
Anyone ever see this? Can beam spot be affected by neckboard signal in such a way? Or is maybe the electrode/heater assembly in the tube doing weird things?
No, I forgot to take photos!
TIA,
Steve
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat May 05, 2012 6:14 pm Post subject: |
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A couple of things:
1) Unplug the astig connectors. Iv'e had a couple of astig boards fail to give ovals instead of dots at 50/50 settings.
2) I've had a couple of bad/weak astig magnets cause strange dot shapes. Try swapping with another tube.
Cheers!
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Sat May 05, 2012 6:42 pm Post subject: |
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| Curt Palme wrote: | A couple of things:
1) Unplug the astig connectors. Iv'e had a couple of astig boards fail to give ovals instead of dots at 50/50 settings.
2) I've had a couple of bad/weak astig magnets cause strange dot shapes. Try swapping with another tube.
Cheers! |
Cool, will try. So you've never seen weird beam spot due to the tube?
Steve
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat May 05, 2012 7:49 pm Post subject: |
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Not yet.  I had one LUG tube off Terry that we talked about here at length. I put it into a Marquee housing, and couldn't get a good dot no matter what I did. I finally decided that the tube was bad. I then put the tube into a Barco, and the tube focused fine. Turned out that the astig magnet was bad. I'd changed the focus yoke and board in the Marquee, thinking it was one of the two. Sold the Barco, and the customer loved it.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat May 05, 2012 8:31 pm Post subject: |
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| Curt Palme wrote: | | Not yet. I had one LUG tube off Terry that we talked about here at length. I put it into a Marquee housing, and couldn't get a good dot no matter what I did. I finally decided that the tube was bad. I then put the tube into a Barco, and the tube focused fine. Turned out that the astig magnet was bad. I'd changed the focus yoke and board in the Marquee, thinking it was one of the two. Sold the Barco, and the customer loved it. |
I remember that thread, I wonder if some how some where in the Marquee housing a magnetic field was created?
I know its Aluminum but cant aluminum maybe get even a small magnetic field?
Steve, did you maybe put the CPC magnets in very close contact to the G90 focus yokes while not in the PJ?
Athanasios
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Sun May 06, 2012 4:00 pm Post subject: |
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| Nashou66 wrote: | | Curt Palme wrote: | | Not yet. I had one LUG tube off Terry that we talked about here at length. I put it into a Marquee housing, and couldn't get a good dot no matter what I did. I finally decided that the tube was bad. I then put the tube into a Barco, and the tube focused fine. Turned out that the astig magnet was bad. I'd changed the focus yoke and board in the Marquee, thinking it was one of the two. Sold the Barco, and the customer loved it. |
I remember that thread, I wonder if some how some where in the Marquee housing a magnetic field was created?
I know its Aluminum but cant aluminum maybe get even a small magnetic field?
Steve, did you maybe put the CPC magnets in very close contact to the G90 focus yokes while not in the PJ?
Athanasios |
No, but they were right up against the G90 yokes while they were in the set. I've got some other 2/4/6 CPCs I can try out.
Steve
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun May 06, 2012 4:11 pm Post subject: |
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| mr_ro_co wrote: | No, but they were right up against the G90 yokes while they were in the set. I've got some other 2/4/6 CPCs I can try out.
Steve |
it's ok if they're co-linear like on the tube neck, but putting focus yokes next to each other where they can touch side by side can ruin them. Same is true for the CPC's.
I had a bad focus yoke in a 9500 once, it was fine at some settings but would do exactly what you described as you ramped the stig menu toggle up and down. So it's either the yoke or the CPC's, not the tube
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Sun May 06, 2012 5:40 pm Post subject: |
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| draganm wrote: | | mr_ro_co wrote: | No, but they were right up against the G90 yokes while they were in the set. I've got some other 2/4/6 CPCs I can try out.
Steve |
it's ok if they're co-linear like on the tube neck, but putting focus yokes next to each other where they can touch side by side can ruin them. Same is true for the CPC's.
I had a bad focus yoke in a 9500 once, it was fine at some settings but would do exactly what you described as you ramped the stig menu toggle up and down. So it's either the yoke or the CPC's, not the tube |
Thanks! I agree, but others place less importance on this issue. The CPCs in this set were shipped in small box with no special provision for keeping them from touching each other.
I'll try some other CPCs. I bet that's the issue.
Steve
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun May 06, 2012 11:34 pm Post subject: |
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Hello
Loosen the clamps and rotate the entire focus yoke, and the entire flare yoke assembly; that should tell which has the problem.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Mon May 07, 2012 3:54 am Post subject: |
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FYI, if you have focus yokes (for a Marquee) that work but deliver poor focus, odds are that their magnetic fields are distorted or at the wrong strength.
TSE has a machine that will fix those problems. You might ask him if he'll do the recalibration of your yoke set for you.
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Mon May 07, 2012 1:50 pm Post subject: |
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| cmjohnson wrote: | FYI, if you have focus yokes (for a Marquee) that work but deliver poor focus, odds are that their magnetic fields are distorted or at the wrong strength.
TSE has a machine that will fix those problems. You might ask him if he'll do the recalibration of your yoke set for you. |
Good to know! I'm interested in doing that.
Steve
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