I bought some tapes off ebay and found some unstable,but the reels were good,so reloaded with lpr35 pancakes,just a small adjustment to the bias and record levels were needed on a rs1700.very good tape for domestic use i found. did the adjustments with the switches in there centre position,recently purchased a reel of maxell udxl1 used, to see how compatible it was,and found no adjustments were required.