just bought a used jr9001s servo from someone on this site. installed in in my tc and it seems to make alot more noise than my cheep servo. Make a humming noise with a little bit of load on it. Is this normal for this servo or did i buy a junk one.

Its digital. It is constintly trying to center itself... Its doing its job.

good, thank you. this is the first digital servo i have had and wasnt sure.