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An update regarding the arc event.
UPDATE, JULY 3, 2019, DAY 333
From Mike: “Hi Marshall. Short update here. The flash that I serundipidously caught occurred between the top of the HV regulator and one of the new electrolytic cans that I installed during the recap process. The cans come in all kinds of different “heights”. And I was careful to make sure that the clearances were OK for the crt to fit back in. But, I missed the fact that this one is just tall enough to creat a nice “spark gap” for the HV regulator. LOL! By the way, I meant to include that those images are MIRROR images. Anyway, the focus rectifier takes a large HV hit any time that there is a HV arc because it creats a “field flash” in the core of the flyback that is tranmitted to all of the rectifier tube filament wires. The HV rectifiers survive this field flash because they are rated for a much higher voltage than the focus rectifier is ratated for. The fix is easy. I will be adding insulation to all of the nearby electrolytic cans. I will also be adding a fiberglass barrier between the focus rectifier and the HV rectifiers. This will add some isolation between the two circuits. Westinghouse should have added this barrier anyway, in my opinion. I say that because of the close proximity of all those tubes to each other inside the HV cage. When on the jig, that tube and HV cable did not exist. I was running unregulated. More later,
Regards, Mike”
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Last edited by etype2; 07-03-2019 at 11:40 AM.
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