Master Wire Recorder
J. S. Boyers, R. E. Zenner · The Journal of the Acoustical Society of America · 1947
In the preparation of commercial recordings, the live performance is usually recorded by the use of equipment of the highest possible quality, so that the duplicates made from the master record may still be of satisfactory quality despite the losses which are inevitable in any duplication process. A wire recorder has been constructed for use as a master recorder. Design of the unit is discussed, including (1) mechanical drive system, (2) electronic circuits, and (3) properties of the recording wire and heads.