Abstract: A large-sized tape cassette has a width, measured in a transverse direction, larger than the similarly measured width of a standard, relatively small-sized tape cassette and, for the purpose of being adapted to be selectively loaded, in place of the standard cassette, into a tape cassette recording and/or reproducing, the large-sized tape cassette has a bottom surface with a plurality of grooves therein extending at right angles to the transverse direction and spaced from each other by a distance equal to the width of the standard, relatively small-sized cassette, and the apparatus includes a cassette holder having a pair of parallel guide rails spaced apart for slidable reception in the grooves of the large-sized cassette or for slidable engagement of confronting surfaces of the guide rails with side surfaces of the standard, small-sized cassette.

Abstract: A large-sized tape cassette has a width, measured in a transverse direction, larger than the similarly measured width of a standard, relatively small-sized tape cassette and, for the purpose of being adapted to be selectively loaded, in place of the standard cassette, into a tape cassette recording and/or reproducing, the large-sized tape cassette has a bottom surface with a plurality of grooves therein extending at right angles to the transverse direction and spaced from each other by a distance equal to the width of the standard, relatively small-sized cassette, and the apparatus includes a cassette holder having a pair of parallel guide rails spaced apart for slidable reception in the grooves of the large-sized cassette or for slidable engagement of confronting surfaces of the guide rails with side surfaces of the standard, small-sized cassette.

Abstract: A rotary magnetic head drum apparatus for a video tape recorder of a helical scan type having small projecting members provided on a fixed drum of a rotary magnetic head assembly in the vicinity of the switching positions at the entrance and exit sides for a magnetic tape. The projecting members cause the magnetic tape locally to be displaced radially outward from the surface of the fixed drum so as to reduce longitudinal vibration of the magnetic tape and hence reduce impact error in a signal reproduced on the magnetic tape by two rotary magnetic heads.