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It can, but

Posted by Ralph on February 9, 2017 at 11:30:50:
the 6H30 can be a source of that too. I bet these are easier to deal with :)

If the regulator is poorly bypassed, you can run into HF artifacts.

The regulator has a certain amount of bandwidth. Above that frequency it should be bypassed with a capacitance (so you can see here that the value of ideal capacitance may not be all that large) such that the output impedance of the combination is as linear as possible (there will be a step in the curve as the regulator typically has lower output impedance than the bypass cap will).

Hopefully that's all been dealt with. But what if the cap is failing, like maybe its a small electrolytic and just takes a while to come up to speed?

IOW it might be worth changing that part if this is the case but I would be hesitant to change out the regulator without doing the math.