Can tube rolling change bass?

To answer your question, tube rolling can affect bass to a minor degree. FME, bass is mostly affected by the room and speaker location. Smaller bass adjustments can be had by equipment, amps, preamps etc. Smaller yet bass adjustments can be had by cables and power cords. Tube rolling comes in next, and probably last for bass adjustments. You can find some tubes that may have some minor affect on bass. In my tube rolling experiences, I've noticed most differences in tubes lie in the midrange, high's, soundstaging, and aspects like that. Bass to a much lesser degree.

Cheers,
John

Usually the tube rolling can change the sound signature slightly. So the difference is not bigger.

Yes, it can.

I might add that a change in speaker cable can assist in adding incremental bass as well. As mentioned earlier I noticed an increase in bass. Let me add that the bass was tighter and somewhat deeper. It was NOT and increase that
created a totally new sound it just enhanced. I may have mislead some by a less descript measure of improvement.
My answer was directed at your question and the simplest answer is, yes. The amount and degree will depned on your total system and in some cases the answer could be NO.
FME, it helped.