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I pulled the chassis on the Jackson today. The horzontal squeal did go away after allowing the set to dry out. I thought I heard a faint arcing so I investigated. A resistor had somehow bent toward a tube socket and was giving a little snap. I might add that a different CRT was just intstalled prior to me buying it, the old crt bit the dust when it was moved recently. The set has recently been recapped, but I see some resistors that have gotten warm. The set has a prominent white vertical line that I am guessing is either a horizontal drive adjustment, or one of those resistors is out of value. I am going to make a list of resistors and replace them. I spent a good amount of time cleaning the inside of the cabinet and the chassis was full of dust. Also fixed a tear in the speaker that I made when I hit it with the vacuum nozzle. The Aleenes original tacky glue and pieces of a coffee filter work great. Cleaned the grill cloth and the set has much better visual to it.
The Travler set is a little dandy and is playing 'Combat' right now, but does have a slight audio buzz that I will look into.
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