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the static sound may be due to a defect in the high voltage circuits, IE Fly-back transformer or and voltage multiplier, posibly high voltage leads to the CRTs arching to ground, finally horizontal sweep circuits
Whenever there is a a spark or a flash it generally means high votage(HV) is arching either from the flyback, one of the CRT's or HV splitter/Focus block where the HV is created - It will be easy to diagnose but probably expensive to repair. Parts costs- Flyback and HV block $100-200 and CRT over $300
Can you remove the rear panel and check if the hissing is coming from the flyback? Which is a large transformer with a large red wire coming from the top of it? If so can post a link where you can get a replacement their not exspensive and their easy to replace. If its not coming from the flyback post a picture of where the hissing is coming from and I will identify the parts for you, But I feel its the flyback due to the hissing. respond to this same post so I have your correct model number when you reply.