Recently picked up a TA-N86 (with no B, silver-face not grey). Just realized from research on the internet this unit was only sold in Japan. Checking out the back for voltage, noticed the Sony label was cut and removed just after the serial number, so I no voltage information. Has a standard US plug, are the Japanese ones different? Before I noticed the lack of the "B", I hooked it into a system and played 2 CDs (about two hours of play time). It sounded great, didn't blow any fuses or blow up the amp. Is there any way to determine what voltage it's supposed to be using?