Valuable vintage audio typically features heavy construction, wood cabinets, analog VU meters, and prestigious brand names from the 1960s-1980s golden age. Key indicators include tube amplifiers , direct-drive turntables, silver-faced receivers, and equipment originally costing over 1,000 guilders. Model numbers matter significantly – a Marantz 2270 is worth €2,000+ while a 2220 brings €400. Initial consultation helps identify potentially valuable pieces.