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carbon deposits for HV arcing in the HV rectifier socket, and around the flyback area could cause this. Probably low high voltage causing lack of focus while it was crackleing and hissing. Also check around the damper tube socket. The damper tube plate does tie back to the 390v (b) source. I doubt the focus problem caused the burnt resistor. Check the windings of the vertical output transformer and componants in the vertical output circuit, including the 6JC5 tube and socket.
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