Have you cleaned the contacts in the tuner? I've seen dirty tuner contacts do stuff like that.
If you have not cleaned the tuner contacts make sure to get both the ones involved in changing channel and the tube socket pins.
I recommend Deoxit, or the cheaper comparably effective De-ox-id as the cleaning solution. If you can rub the contacts with a pencil eraser (the soft white ones are especially good) while they have the cleaner on them it will be better still. Those erasers are almost good enough contact cleaners by them selves to not need the spray.
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