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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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CRT Data Book?
Is there a good resource for CRT technical data? Things like bulb shape,
deflection angle, electrical requirements, etc? I really need something to help me when swapping CRTs - I often think I've found a proper match, only to discover that the replacement CRT has a different deflection angle or something. Such a resource would be a great time-saver. Thanks. |
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On Wed, 01 Dec 2004 18:46:50 GMT "Chris F."
wrote: Is there a good resource for CRT technical data? Things like bulb shape, deflection angle, electrical requirements, etc? I really need something to help me when swapping CRTs - I often think I've found a proper match, only to discover that the replacement CRT has a different deflection angle or something. Such a resource would be a great time-saver. Have you looked at the Sphere web site? He has a lot of data posted there. www.sphere.bc.ca - ----------------------------------------------- Jim Adney Madison, WI 53711 USA ----------------------------------------------- |
#3
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think I've found a proper match, only
to discover that the replacement CRT has a different deflection It's not only that. Nowadays you need to match the yoke to the internal convergence poles. In many cases you find that even if the deflection is OK, you can't get edge convergence. It's off in a way that does not respond to yoke tilt properly. Many times you might get close on everything but the H lines at the top and bottom for example. The only way to see for sure is to plug the chassis into the CRT and look, and I always do this before actually installing it if the numbers don't match. The specs that'll tell you this are likely to be complex, such as delta field @ max V deflection @ vector XXX degrees or something like that. Simple deflection angle is actually moulded into the CRT bell, or used to be, it would be like 27V90, 27V100 etc., not to mention there are different degrees of arc across the face. Electrically these tubes could all be the same, maybe even use the exact same gun assembly, it's the variables having to do with magnetic fields that trip you up. JURB |
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