[old_tv_nut]

Hint: any circuit that is "tuned" for correct operation will have an adjustable component, like a coil or potentiometer. If the fixed-value caps are way out of tolerance, the circuit is already detuned, and the best thing is to replace these and retune the circuit.

Note that the small ceramic or mica caps that tune the IF or tuner are seldom bad, compared to the larger paper or film caps or electrolytics in sweep circuits, etc., so it's not a good idea to blanket replace those small ones that tune IF or RF circuits. IF re-alignment is a chore, so if it's not broke, don't fix it.

But the paper or wax caps or electrolytics that affect sweep operation or are B+ bypasses, or large cathode bypasses (like the video output) etc. are worth replacing when things don't work right. The retuning then consists of adjusting the sweep size and linearity, for example, which will work much better if the fixed resistors and caps are within tolerance.