Ed's Reel to Reel Question

I apologize if this is a stupid question:

I've searched the forum, I've searched Google, I searched a website called THE MUSEUM OF MAGNETIC RECORDING....   and I can't seem to track it down.  I'm looking for the brand of reel to reel tapes Ed uses on stage, and I can't find any information or images that match.   I can't tell if it's HR, HB, MR, MB...