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barco_75
Joined: 14 Jan 2009
Posts: 171
Location: Chicago
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| Posted: Mon Dec 02, 2013 2:54 am Post subject: Bad Glycol? |
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Hi, I have a few air cooled tubes which have an unusual appearance on the glass. See attached photos (pattern marked with red). I only notice an issue when you use a flashlight on the face of the glass. If I didn't use the flashlight, I would of thought the tubes are fine.
One tube has close small lines like a fingerprint which appears to be on the backside of the front glass. When you place a flash light on the front glass the lines stay together but will shift as you move the light. I drained part of the glycol and the lines appear to stay on the backside of the glass. I'm wondering if I have bad glycol which is clinging to the glass?
The other tube appears to have an air bubble. Like the other tube, the "bubble" shifts when I use the flashlight. I pulled the rubber seal on the glycol chamber and the "bubble" didn't escape so I don't think this is an air bubble. Again, I'm thinking it's bad glycol clinging to the backside of the glass.
Anyone know the real cause of these anomalies? Is there such a thing as bad glycol? I'm hoping I don't have to pull the glass to determine the cause.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 02, 2013 5:27 am Post subject: |
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Possible someone had to replace the glass(been there before) get some clr and go by the defugusing method on the main site I did that with a spare 07ms tube and then rinsed it out with water before putting fresh glycol in you couldn't tell it ever had the fungus and yes this will work with fingerprints
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crt king of black
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barco_75
Joined: 14 Jan 2009
Posts: 171
Location: Chicago
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| Posted: Mon Dec 02, 2013 2:27 pm Post subject: |
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Just for clarification, the "fingerprints" are too large to be actual fingerprints. However, the shape resembles a fingerprint. It seems strange that a fungus would produce these shapes, but maybe? I'll have to drain and see if the CLR and water flush out the distortions.
These tubes have a rubber expansion bulb at the top and a screw plug at the bottom. Any recommendations on glycol filling procedure? I'm guessing I don't fill as recommended on the defugusing webpage. I'm assuming I can just fill to the top of the CRT housing, push the rubber expansion bulb into the glycol, let it bleed past the rubber seal and then secure the rubber bulb. This will leave almost no air in the chamber but the rubber bulb can expand out if needed. When I removed the bulbs they seemed to have no air in the chamber.
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 02, 2013 4:19 pm Post subject: |
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| barco_75 wrote: | Just for clarification, the "fingerprints" are too large to be actual fingerprints. However, the shape resembles a fingerprint. It seems strange that a fungus would produce these shapes, but maybe? I'll have to drain and see if the CLR and water flush out the distortions.
These tubes have a rubber expansion bulb at the top and a screw plug at the bottom. Any recommendations on glycol filling procedure? I'm guessing I don't fill as recommended on the defugusing webpage. I'm assuming I can just fill to the top of the CRT housing, push the rubber expansion bulb into the glycol, let it bleed past the rubber seal and then secure the rubber bulb. This will leave almost no air in the chamber but the rubber bulb can expand out if needed. When I removed the bulbs they seemed to have no air in the chamber. |
Remove the screw and follow the steps on the page
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crt king of black
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barco_75
Joined: 14 Jan 2009
Posts: 171
Location: Chicago
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| Posted: Wed Dec 04, 2013 3:54 am Post subject: |
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Looks like it is bad glass. Guessing manufacturing defect. Do you think it would affect picture?
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Wed Dec 04, 2013 3:59 am Post subject: |
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| barco_75 wrote: | | Looks like it is bad glass. Guessing manufacturing defect. Do you think it would affect picture? |
Maybe maybe not it depends on where its at and how bad it is
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crt king of black
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barco_75
Joined: 14 Jan 2009
Posts: 171
Location: Chicago
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| Posted: Wed Dec 04, 2013 4:22 am Post subject: |
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I rinsed out the chamber with distilled water after doing the CLR. Should I let the inside of the chamber to dry before refilling with Glycol. I'm thinking it's best not to let dry so there are not any water marks. Suggestion?
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Wed Dec 04, 2013 4:40 am Post subject: |
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| barco_75 wrote: | | I rinsed out the chamber with distilled water after doing the CLR. Should I let the inside of the chamber to dry before refilling with Glycol. I'm thinking it's best not to let dry so there are not any water marks. Suggestion? |
I didn't and haven't on any tube I have worked with
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crt king of black
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barco_75
Joined: 14 Jan 2009
Posts: 171
Location: Chicago
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| Posted: Wed Dec 04, 2013 4:41 am Post subject: |
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didn't let it dry?
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Wed Dec 04, 2013 5:10 am Post subject: |
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| barco_75 wrote: | | didn't let it dry? |
Nope I just emptied the glycol rinsed with water then cleaned it with clr then rinsed again then put the glycol in never knew the tube has fungus before and so far it hasn't got fungus again
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