Abstract: A mechanism for adjusting magnetic head azimuth comprises a base plate carrying a magnetic head thereon, and this base plate is supported at two portions close to its both ends above a chassis. At one of the two supporting portions is provided an adjusting screw and a coil spring so that the base plate is upwardly biased by the coil spring in the same manner as in conventional arrangements. At the other supporting portion is provided a stationary supporting leg interposed between the lower surface of the base plate and the chassis where the base plate is screwed to the supporting leg having a generally rectangular flat top end defined by two straight parallel edges. One of the straight edges corresponds to a radial line passing through a center screw hole made in the supporting leg, and these straight parallel edges are arranged to be parallel to the center axis of the magnetic head.

Abstract: A record and a play keys of a magnetic tape recorder/player are depressed in order to set the recorder/player in its recording mode, and they are locked in their depressed positions by means of a first locking plate. In the above, the record key is further locked by means of a second locking plate due to the play key in its depressed position. When a stop key is depressed to stop the recording mode, the record and play keys are unlocked from the first locking plate so that the play key is released from its depressed position, and after the release of the play key, the record key is released from its depressed position.