I've just received my old school 70's ones and plugged them in my Fiio X1. Astonishing good sound (tested with the last album "Momentum" from Soulpersona, and the soundtrack from the film "Interstellar"). I like them more than the Porta Pro's and even the Fostex Th7. Only comfort is not that...

07/11/2015 : I've found these cans for 19.99 EUROS at HEADSOUND, with shipping cost 15 euros. Seems to be a great deal, the other models are on special offer too (Old skool 33 1/3 at 69 euors).