Seven vintage but affordable amplifiers to upgrade your listening setup. Here’s a scenario that virtually anyone who has entered the home listening game by investing in a vintage power amp or receiver has likely confronted. You’re aware of the brands -- Sansui, McIntosh, Marantz, Pioneer, Harman Kardon -- but you don’t know where to start and you don’t want to mess up by buying something too old, battered or temperamental. We hear ...