I was so impressed with these cal tapes I bought 4 of them
2 speeds for my studer A810 and 2 for my BR20 both 7.5 & 15"
I really like the full range of tones, I seem to be able to get my recorders freq response flatter
http://www.ebay.co.uk/itm/TASCAM-All...QAAOSwAANY5ROc

Alan