One
of the biggest advances in systems Hi-Fi was the appearance of magnetic tape
cassette. It was first introduced by Philips in 1963 as Compact Cassette.
The unit uses a magnetic tape cassette mounted in a plastic case for
storing sound signals. To record is passed by a tape recording head amplifier.
The signals recorded on the tape can be "read" later by one or more
playback heads.
The cassette unit requires a motor to wind the belt system, and also has
devices for improving sound quality and to avoid distortion. An essential
device is the sound level meter can be a VU (volume unit)
Each
cassette unit contains an oscillator bias (bias) which produces a high
frequency signal on the tape inaudible. This signal is combined with the sound
before it reaches the recording head. Its purpose is to help reduce the
distortion in the recording system. It can also be used to clear signals before
recording.
1) Stereo cassette deck Denon DR-F3.1980. 3 Heads System.
2) Marantz Deck SD-930 with auto Azimuth Control. 1983.
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