Hi guys I and my friend went for listenning to a secondhand krell kav 250p/250a. system was : audiolab cdplayer dynaudio audience 82 monster cable Sound was under krell standard and it's ability in driving my speaker was bad. we turn up volume but krell could not load my speakers it was like a 70 watt/ch amplifier. I confused and i told to my friend maybe this amplifier have problem but my friend told me maybe this amplifier did not work and it did not spend breakin time. he told me every new amplifier need 100 hrs for giving it's real power and a new 250w/ch amplifier sound like 70w/ch amplifier during first 50 hrs running. But now i can not undrestand what's correct, secondhand amplifier is safe or it have problem in it's circuit?! can you help me? Thanks