When I first got a reel to reel back about 77 I was trying every cheap tape I could find and one of them was BASF. That stuff shed so much oxide all over my hard permalloy heads on my cheap Akai 4000ds mkII that it would start dropping out after about 45 minutes of recording. I gave up on that...
I recently got 5 reels of BASF/ Emtek 468 from a seller outa Canada on Ebay. He frequently lists various package deals on the 468, Zonal 418/420, 3M 908,
and Quantegy 480. He list them as 1 pass tapes made for Nagras that were used in movie sound production.
It took my 5 a while to get here but...
OK, I'm new here and just recently got a few Akai gx reel to reel decks, a 230d and a 270d. They're pretty similar machines electronically with the 270 being newer with soft touch solenoid controls and the 230 being mostly mechanical.
I'm try to bias these two for the tapes I have and the manual...