And there is no harm in buying a pre-owned unit? Are preamplifiers proned to diminished reliability and quality after use?
No,used gear is not prone to any more defects over new gear,infact ive found just the oposite with new gear having more problems requiring service,from my experience used gear is more dependable because its allready been put to the test & lasted many years.
Hifi & stereo gear is not like a TV,warrenty's are over rated in most cases & in all cases over charged,from my experience warranty's are only usefull for bottom of the barrel gear with questionable build quality & quality control to start with,there is a reason why mid-fi & hi end gear costs more,build quality & quality control attest for much of the cost,its not all hype as others will have you believe.
Dont get sucked into being scared of used gear/speakers over the warrenty issue,even if service is required in the future the savings from buying used still make up for the cost of service,usually many times over.
I think alot of people fixate on warrenty being an issue without having any real meaningfull ewxperience with used gear,dont be scared of buying used if you want to save a big wad o cash.