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Check the focus rectifier socket for carbon traces. Look for any tracks of carbon in the HV area. There are several spark gaps, unless the leads are bent and shorting they usually are not the problem. In other words you would only get a spark if there is a problem causing the voltage to go way higher than normal. There are gaps on c143, and c142 both in the 800volt boost. One of these is located near the screen controls, the other is under the HV cage. Also check the controls on the rear panel. The vert lin control has 800v boost on it, and can arc.
Good Luck
Bill R.
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