Of course. Motor bearings and things relax and bed-in with time. The same way you can't use launch control in a Dodge Demon until you've done 500 miles.
Depends more on the repeatability of the owner's skill in setting up a phono cartridge. Also, all audio systems sound different on different days, for many different reasons. Ask a better question.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.