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is a tube with a colour going suitable?


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Hey mate,

 

I sent an email around work and have had a few offers of free tv's. However most of them have a colour going, either the red or similar.

 

I presume that would be the chassis on the TV that is going but wanted to confirm that something like that wouldn't be a problem.

 

If the colour issue isn't an issue then I reckon I'll be ordering a chassis from ya soon :)

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From my (limited) experience with TV's, colour problems are often in the CRT (low gun emission) so I'd probably avoid those ones.

 

Thanks for the info. so if one has a dodgy tuner I should be right. hmm..

 

I've been offered one where the red is a tad off, but after a bit comes good (ie. when it warms up). Would that be the gun or the chassis?

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Hey mate,

 

I sent an email around work and have had a few offers of free tv's. However most of them have a colour going, either the red or similar.

 

I presume that would be the chassis on the TV that is going but wanted to confirm that something like that wouldn't be a problem.

 

If the colour issue isn't an issue then I reckon I'll be ordering a chassis from ya soon :)

 

It funny how many people think there TV is losing color or have colors missing only to find it is being caused by a badly adjusted TV or chassis faults.

I think one of the biggest Myths of all time with TV's is that the Tube is stuffed when in reality it is extremely rare for a TV chassis to outlast the tube itself.

 

If you are getting them for free then you havent lost much trying them out :)

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Even 20 years ago when I was still working on tv's on a daily basis, there was only a few sets which actually had faulty tubes. National was one of the biggest problem sets around and probably closely followed by Rank Arena (NEC made them), but in the last 10 years or so I am yet to see a set with a faulty tube. Yup I still get talked into looking at sets for family and friends, even though a tele these days is almost free when you buy a carton of milk. :)
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I think one of the biggest Myths of all time with TV's is that the Tube is stuffed when in reality it is extremely rare for a TV chassis to outlast the tube itself.

I stand corrected! My comment was based on my own Panasonic TV that had the tube go bad. It was 12 years old I must say.

 

Glad to hear good ol' toobs are better than I thought. I guess my worry is that you get a 2nd hand CRT, get a Jomac chassis for it but the CRT is bad. If the next tube you try is a different make / model, can the same chassis be used without modification?

 

I remember reading here something about the chassis having to be matched to the yoke resistances. (and inductances?) If the CRT's you collected were wildly different, would the chassis need to go back to Jomac for mods or could a couple of small parts be swapped out or adjustments made? I think this is what people collecting CRT's want (or need) to know.

 

...in the last 10 years or so I am yet to see a set with a faulty tube.

Would you count faulty yokes in that? The reason I ask is that I'm on a technicians email list and hear about faulty yokes from time to time. Is there a reliable way to test them (visual inspection, resistance?) before adding the CRT to the "hoarding heap"? :unsure

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I may be able to get my hands on a 62cm 2 year old NEC! apparently it's in perfect working order, only getting chucked cause the owner has got a new LCD.

 

Hmm 62cm = 24.4094488 inches... not quite 26inch :( but it's all mine :)

 

also got what I think is a 19" which should be good :) that's the size i need for my sit down (though considering whether to try and squeeze a 21" in to it).

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I stand corrected! My comment was based on my own Panasonic TV that had the tube go bad. It was 12 years old I must say.

 

Glad to hear good ol' toobs are better than I thought. I guess my worry is that you get a 2nd hand CRT, get a Jomac chassis for it but the CRT is bad. If the next tube you try is a different make / model, can the same chassis be used without modification?

 

I remember reading here something about the chassis having to be matched to the yoke resistances. (and inductances?) If the CRT's you collected were wildly different, would the chassis need to go back to Jomac for mods or could a couple of small parts be swapped out or adjustments made? I think this is what people collecting CRT's want (or need) to know.

 

 

Would you count faulty yokes in that? The reason I ask is that I'm on a technicians email list and hear about faulty yokes from time to time. Is there a reliable way to test them (visual inspection, resistance?) before adding the CRT to the "hoarding heap"? :unsure

 

Great Post Dave !

 

It has happened to a few members here where we have found the Yoke is fried or the tube has been knocked around and cant be used.

If another tube is vastly different you might need to send the chassis back to be modded , in a lot of cases I have been able to send the parts needed and explained the mod over the phone or I will swap the chassis over with another model .

Basically as most know I do whatever is necessary so you have a working monitor.

 

 

As a good guide to collecting TV tubes , stay away from tubes with 12 pins ( arcade 12 pin tubes are ok ) check for any physical damage to the yoke, a major cause of yoke failure is moisture so look for any corrosion as some of the TV's guys pick have been rained on.

Stay away from Sony TV's because the tubes cant be used , keep pretty much everything else including those huge 33" TV's which can also be used.

 

I didn't include faulty yokes in the dead tubes count , this is way more common than dead tubes themselves , so for people not capable of swapping a yoke and resetting convergence will often say the tube is stuffed even though the yoke is a separate item.

In reality there are tubes that cant be used anymore because a yoke cant be found but the tube is still ok.

 

I may be able to get my hands on a 62cm 2 year old NEC! apparently it's in perfect working order, only getting chucked cause the owner has got a new LCD.

 

Hmm 62cm = 24.4094488 inches... not quite 26inch :( but it's all mine :)

 

also got what I think is a 19" which should be good :) that's the size i need for my sit down (though considering whether to try and squeeze a 21" in to it).

 

I have never heard of a 62cm TV before ? it might be a wide screen TV ?

 

There is virtually no difference between 19" , 20" , 21" , actually what people call 19" and 20" are the same 48cm , 21" is 51cm so not a lot in it.

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Can wide screen TVs be used on a Universal Chassis?

 

They do come up but only in 4:3 format instead of 16:9 so it looks really silly with big black bars each side.

If you adjust to suit the screen the games will come up out of proportion.

 

In summary probably not a good choice for arcade use.

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I picked up these from a TV repaired today:

2x 20" from NEC TV. CRT the same but not marked as NEC.

1x 20" Sharp from Sharp TV.

1x 68cm Mitsubishi from Mitsubishi TV.

1x 68cm Thompson from some odd brand TV.

 

There was also three flat screen (dead flat) CRT's. I was thinking of getting at least one, but AK seemed to think they are not usable with the universal chassis you sell. I think two were Panasonic and one was Samsung. I think all of them had what looked like an extra degaussing coil very close to the yoke. What's that all about?

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I picked up these from a TV repaired today:

2x 20" from NEC TV. CRT the same but not marked as NEC.

1x 20" Sharp from Sharp TV.

1x 68cm Mitsubishi from Mitsubishi TV.

1x 68cm Thompson from some odd brand TV.

 

There was also three flat screen (dead flat) CRT's. I was thinking of getting at least one, but AK seemed to think they are not usable with the universal chassis you sell. I think two were Panasonic and one was Samsung. I think all of them had what looked like an extra degaussing coil very close to the yoke. What's that all about?

 

Did ya get em free or did you have to part with some hard earned cash?

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I picked up these from a TV repaired today:

2x 20" from NEC TV. CRT the same but not marked as NEC.

1x 20" Sharp from Sharp TV.

1x 68cm Mitsubishi from Mitsubishi TV.

1x 68cm Thompson from some odd brand TV.

 

There was also three flat screen (dead flat) CRT's. I was thinking of getting at least one, but AK seemed to think they are not usable with the universal chassis you sell. I think two were Panasonic and one was Samsung. I think all of them had what looked like an extra degaussing coil very close to the yoke. What's that all about?

 

Just so everyone knows , 68cm ( any tube that has a part number that starts with A68....... ) is what we call 29" here in Australia . In USA only they call this 27" .

So Atro's ect are 29" 68cm .

 

All the tubes you have picked up so far Dave are fine , ( good work ) You can use Pure flat TV's from 13 to 21" only .

The extra little coil is a rotation coil for advanced on screen options that some TV's have , not used needed for arcade monitors though .

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There is virtually no difference between 19" , 20" , 21" , actually what people call 19" and 20" are the same 48cm , 21" is 51cm so not a lot in it.

 

Thank you Joemac, people never seem to believe me when I say there isn't really a 19" tube. It's a 20" tube with 19" visible.

BTW, I do have a working 18" here :)

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