Sony Open Reel Tape Deck - TC766-2

My restored Sony Open Reel Tape Deck, besides cleaning, polishing and oiling, the rubber pinch rollers were machine ground by specialists.  The old transistors in the preamp circuits were replaced with new ones and this significantly reduced the transistor noise (hiss) to an inaudible level.  Without tapes to really test out the machine, I purchased a few from eBay sellers, choosing only 7-1/2 ips (inch per second) tapes.  Sounds wonderfully analogue - frequency response was acceptable and the recording is as good as the equipment and technology could reach back then.  As the unit can go up to 15ips it would be good to lay hands on such a recording (hard to find) - as the Tape Project  tapes are definitely out of reach for me.....