Thanks James. I'm pretty sure the replay chain was calibrated to the test tones - the recordings were indeed made at Spaceward! I wish now that the transfers had been made with and without the Dolby A decoding. I think the tapes were BASF as you say. One of the problems was that we only had a 15 ips Dolby A copy of the original 1/4 master to work with. This has also been stored in Gary Lucas (the Spaceward Engineer)'s loft for around 26 years maybe had lost a bit of sparkle? Interesting that you have transferred quite a few of their tapes. Have you not noticed any lack of top with some of the older tapes?