I really don't get the fascination with vintage electronics gear. Electronic parts wear out with age. It's like picking a woman for a wife. A 20 year old girl is the prime target of any man with normal inclinations. A 30 year old girl is, sub-prime. A 40 year old spinster, is tolerable at best. A 50 year old spinster, man will avoid her like the plague.
Most vintage receivers are at least 20-30 years old. That's like specifically picking out a woman that is 40-50 years old for a wife. That's just not right. Unless you have specific fetishes which I care not to discuss openly on this board.