Due to my recent 4-tracks tapes fever/syndrome and the little, humble Tandberg 3500 on duty of the bulk of pre-recorded tapes in my hands and coming, I was thinking and pondering and... well: my old, trusty, beloved Nagra IV-S and QGB will soon have fitted a 4-tracks head.
My karma asks for that;-))) and my tech-head extraordinaire will flawlessly made it!