If audio equipment in the 70's is considered better than that made today could it be because in the 70's equipment was made with quality components while today it is made of
Braun audio: legendary stereo's from the 60s and 70s by Dieter Rams
3A: Art & Acoustique Appliquée - a leader in the 70s and 80s
Bringing Vintage Hi-Fi into Your Life - InsideHook
Stereo Gear in the 1970's Was it The Audiophile Golden Age? | Audioholics
ULTIMA 20 Surround + Marantz Cinema 70s | Teufel
Killer SAE Vintage Audio System from the 70's GORGEOUS! - YouTube
This 1970s vintage system probably sounds a lot better than what you're listening to - YouTube