I checked the AC voltage from chassis ground to main (house) ground to determine the correct line-cord orientation. The NAD measured just over 10V (vs just under 19V the "wrong" way—and the plug is not "keyed," footnote 1); this voltage will be shunted to ground when the player is connected to a properly grounded preamplifier.
In order to determine the cause of the slight tracking problems encountered with the player, I checked it with the dropout tests on the Pierre Verany Digital Test CD. The results were perhaps indicative of the problem but not…