Do all FM tuners need alignment eventually?

If it isn't broke,why fix it.

I have some vintage receivers that work great.If the are no signs of a problem,I can't see any reason to have it done.If it is not doing a good job of picking up stations,that would be a reason to.Another reason to have it done would be poor left to right channel stereo separation.Of coarse any poor sound problems may be an alignment problem,or part/parts going bad.

My take on it is this: a solid state tuner would probably not ever need a realignment unless it was shipped (and jostled around) or one of the internal components have failed.

A tube tuner might need realignment if certain (but not all) tubes fail and need to be replaced (tubes in the IF stage, MPX, etc.). And if a station keeps drifting when you try to lock in on it, it may be time for a realignment.

Here's some Tips for Evaluating Your Tuner's Alignment from the H.H. Scott tuner site that might prove helpful: http://hhscott.com/cc/tuner_tips_FM_stereo.htm