CRT ADC Display Badly Magnetized

[bunnspecial]

I decided to sacrifice an old 4gb Maxtor HDD to the cause, as I didn't have any other hard drive magnets handy.

Interestingly enough, I was actually able to get the colors correct in the upper right hand corner of the screen at the expense of other parts of the screen. Degaussing returns the screen to the "normal" distortion that I showed earlier.

I didn't take the cover off, but thanks to the acrylic cover I spent some time looking at the tube. This stuff is slowly coming back to me, but all gun alignments are still at their factory glued and/or painted position.

I still wouldn't rule out a yoke misalignment, but don't know how to check other than getting in and poking at it-something that I'm NOT going to do until the claim is closed.

There's also a chance that I could fix it by attaching magnets to the side of the tube, but again not yet. This was actually done at the factory fairly often, and I suppose there's always a chance that one of the original adjustment magnets could have fallen off in shipping(although I don't see it floating around anywhere).

The beam convergence can be adjusted through software-I played around with that some, but it didn't make a difference.

 

[flyrod]

The mask could also be bent slightly. Does the housing show evidence of the CRT being dropped? Unless there's something special about it, you could probably get a LCD for the price of shipping it.

 

[bunnspecial]

The mask could also be bent slightly. Does the housing show evidence of the CRT being dropped? Unless there's something special about it, you could probably get a LCD for the price of shipping it.

There's no obvious damage.

There is something special about this particular CRT, and if this one ends up going back I'm going to look for another one.

 

[poiihy]

Not to be anal or anything but I am just curious why you bought a CRT montitor? Was it to complete a collection or something? Because I don't think anyone would buy a CRT for actual use nowadays... With that high-voltage deathtrap inside

 

[bunnspecial]

Not to be anal or anything but I am just curious why you bought a CRT montitor? Was it to complete a collection or something? Because I don't think anyone would buy a CRT for actual use nowadays... With that high-voltage deathtrap inside

I wanted all the ADC monitors Apple made-and I do actually have them all now(although this one is damaged).

CRTs do actually have some advantages over LCDs. The color accuracy is better, although it is subject to drift(unlike LCDs). Good CRTs-including this one-have built-in calibration. LCDs and LEDs have improved dramatically in the last few years, but CRTs are still king in contrast ratio and viewing angle. Really high end CRTs are still made for the movie industry for these reasons.

Aside from that-and from a more down to earth perspective-I like the fact that they don't have a native resolution. The maximum resolution is limited by the size of the shadow mask and the gun scan rate. They can be down-ressed and look great at pretty much any resolution. Some LCDs are designed to be run at non-native resolutions(i.e. the Retina displays) but most look like crap any anything other than native. This particular monitor(which is a really great tube) will do anything from 640x480 all the way up to 1600x1200, and looks good at all of them. The refresh rate at moderate resolutions(where most people would use it) is crazy high-I think in excess of 120hz-so eyestrain is almost non-existent. It can even manage 75hz(I think) at 1600x1200, which is still not bad on your eyes.

For most uses, LCDs/LEDs are really a better choice. They're so much lighter for their size, plus smaller in terms of depth(most CRTs are longer than they are wide) and just overall are more convenient. CRTs still have a place, though, and I love using a good quality CRT. The late, high end true flat Trinitrons and the like are the best you'll find in a consumer CRT. Heck, even the true-flat CRT on the eMac is a great tube(I almost prefer it to the LCD on the iMac G4).

I'm still looking for the 21" Trinitron that was a BTO option with the B&W G3 for some of the same reasons-all 77lbs of it make a great monitor!

 

[MagicBoy]

I used a Sony 19" G400 FD Trinitron for 10+ years with my PCs (and PowerMac 7200). Excellent monitor, I just wasn't using it since getting a decent 20" IPS LCD and didn't have the space to store it so ended up going for recycling. 1600x1200 @ 85Hz was rock solid, although the max res of 1800x1400 was pushing the aperture grille pitch. Weighed a good 27Kg and doubled up as a room heater when it was on.

 

[bunnspecial]

I used a Sony 19" G400 FD Trinitron for 10+ years with my PCs (and PowerMac 7200). Excellent monitor, I just wasn't using it since getting a decent 20" IPS LCD and didn't have the space to store it so ended up going for recycling. 1600x1200 @ 85Hz was rock solid, although the max res of 1800x1400 was pushing the aperture grille pitch. Weighed a good 27Kg and doubled up as a room heater when it was on.

The subject tube here gets a bit fuzzy at 1600x1200, and I do think it's a lot more readable at the next setting down(I forget what it is). I think that if you figured the 17" vs. 19" tube, this would scale about the same.

Apple displays tend to be excellent quality as a general rule(at least in my experience) and I have a mid-90s 16" Multi-Scan hooked up to my Quadra 700. I have a Radius Precision Pro X(or XP-I have one of each, and I forget which is in the computer) graphics card in the computer. The on-board graphics are a bit limited, even with the VRAM maxed. I'm working from memory since I haven't even powered up the computer in a while, but I think that the Radius would output 1152x760 at 24-bit color and could go the next resolution down at 32 bit. I run it at 800x600(or whatever oddball resolution Apple came up with that's close to that). I think it's actually a shadow mask CRT(although I may be wrong on that) and it gets really fuzzy at higher resolutions.

Even so, you have to admire how gracefully you can adjust this sort of stuff on a CRT-once you get over the size, weight, and heat

 

[Dronecatcher]

I love the warm aroma that comes from my iMac's CRT...probably the nostalgic memory from peering into the grills at the back of the TV as a youngster, trying to see all the little people from the TV shows
There's definitely something more 'organic' about component level hardware as opposed to integrated circuits.

 

[poiihy]

CRTs do actually have some advantages over LCDs. The color accuracy is better, although it is subject to drift(unlike LCDs). Good CRTs-including this one-have built-in calibration. LCDs and LEDs have improved dramatically in the last few years, but CRTs are still king in contrast ratio and viewing angle. Really high end CRTs are still made for the movie industry for these reasons.

I have noticed that. Colors on a CRT do look more vibrant. The blacks look blacker (not meant to be racist o-o ) and the whites look white. When the screen is black, it looks like the CRT is off, until I actually turn it off and then I see the difference.
I have a COMPAQ CRT. The highest it can go is 85 Hz which is the minimum I would want to use. I cannot tolerate 60Hz on it.


Why is it that CRT monitors don't make a high pitch noise, have a degaussing thing, and have a grounded plug, while TVs do make an annoying high-pitch noise, and don't have a degaussing thing and non-grounded plug?

 

[LightBulbFun]

I have noticed that. Colors on a CRT do look more vibrant. The blacks look blacker (not meant to be racist o-o ) and the whites look white. When the screen is black, it looks like the CRT is off, until I actually turn it off and then I see the difference.
I have a COMPAQ CRT. The highest it can go is 85 Hz which is the minimum I would want to use. I cannot tolerate 60Hz on it.


Why is it that CRT monitors don't make a high pitch noise, have a degaussing thing, and have a grounded plug, while TVs do make an annoying high-pitch noise, and don't have a degaussing thing and non-grounded plug?

well the the vertical (or is it horizontal cant quite remember) sync on a CRT monitor is like 30Khz where as on a 525 line or 625 line TV it is like 15Khz and 15Khz is with in the human hearing range. (also some TVs do have a degauessing coil and grounded plug it Just depends on the TV)