From the liner notes : "This cassette is a selection of material recorded by Cabaret Voltaire during their earlier and formative years of existence. All of the recordings were done in an attic 10 feet by 6 feet, on a domestic reel to reel tape recorder. A number of the recordings here were part of those which made up the now legendary Limited Edition cassette released by Cabaret Voltaire in 1976. Happy Listening."
"1974-1976" was released by Industrial Records in 1980, then re-released by The Grey Area in 1992.
Get it here : Cabaret Voltaire - 1974-1976