Back when I worked in a stereo shop in the mid-70s, all of the sales guys used common metrics to gauge whether a new receiver would be a good seller. Here's hte rollup
Knobs, Lights, and Meters:
Knobs: Had to have plenty - even if they were a set-once type of knob. Bonus points for large, heavily weighted knobs. Minus points for tiny knobs. Too many switches, however, and the receiver appeared over complicated and would scare off buyers - minus points for more than about 6.
Lights: Must be glowing, not bright. Bonus points for more than one color. Extra bonus multiplier for more than 3 different colors well coordinated across the front panel.
Meters: The bigger the better. Back lighting behind the meter is a must. Colors must be coordinated with other panel lights. Bonus for arrow heads on pointers and Peak Hold facility.
I can tell you that those evenings, after work, when the newly-arrived Pioneer, Marantz, Sansui, etc, models arrived were very special and remain in memory some 40 years later. There was much discussion after opening the box and plugging it in as to who would be attracted and why. It all centered on how they would look on the display shelves. BTW, Sansui was the typical winner of these beauty contests.
Cheers,
David
