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lift the all the leads off the junction of the 150k/180k resistors and read the voltage, should be around 180-190v
reattach the leads, it should not change. if it does then there is leakage, somewhere. could be those caps to ground (.001/.001/.1) or a KH short in a tube (the IF tube/shunt tube/CRT).
if it does not change you are good to go.
if it makes you feel more comfortable to change by all means have at it, just make sure the cap is rated at least 400v to be safe (double what it is likely to see)
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