I too sold a fair few NAD 5120s and lots of Dual 505-2s. However, NAD fairly quickly replaced the flat PCB arm with something more conventional, and the 5120 was less attractive to those who wanted something 'funky'.I remember it at £79.95 with cartridge and as I set up, demmed and sold a good few, so feel i can speak first hand here. Cheap tat it certainly wasn't, even if the more expensive Dual 505 series had a more solid feel. I grant you it's not a solid Technics-style productThe later tubular tonearm didn't seem as interesting, however and prices were rising by this time.
P.S. - By the mid 80s, bottom line CD players comfortably outperformed cheaper decks like this and even the 'deluxe-plinth Dual 505s, so interest was moving away - apologies for the digression...
As to design Icons though, Quad and Meridian were for me the leaders, although the Mission 776 and 777 pre and power amp was something else...
