Thanks for the information.There are - but good tape is good tape; stick with, e.g., (used) Maxell UD35 and have your deck biased for it; it's very, very good... or go with one of the currently marketed formulations. Avoid "EE" tape formulations unless you have an "EE" compatible deck, I'd opine.
Yes, 15 is better but 7.5 on a good well adjusted deck with good heads is fine for home archival use, I'd opine.
Your figures are correct for 1 mil thickness tape (1800 foot reels). Isn't it interesting that a traditional LP record is about... 20 to 22 minutes per side! Think about that... a quarter-mile of tape
As to the 15 ips tape run times... that's why they make 10-1/2"/3600 foot reels![]()
I looked up some information about 4-track and 2-track machines. I heard 2-track decks have better signal-to-noise ratio, less bleed through etc. But what if I wanted to also play 4-track prerecorded reels I might come across? Were there ever any combination units made that could switch between 2 and 4 track, were any of them reliable?



