What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Mitsubihi DT-4550

 It is a stereo cassette deck which carries the Dolby circuit. 
The tape hiss noise is reduced by built in the Dolby circuit. 
The DC servo motor which built in the tachogenerator is adopted as a drive motor. This always controlled the number of rotations of the motor at fixed speed, and the stable tape run is realized. 

 The full auto stop mechanism which protects a tape is carried. If a tape finishes also in the case of "recording / play / fast forward / rewinding" throat, a pinch roller and a head block will be canceled automatically and a manual operation button will return. Since a burden unnecessary for a mechanism is not placed by this, the effect is raised also to improvement in durability. 
In order to employ the characteristic of the tape to be used efficiently, the tape selector which made the equalizer become independent of bias is carried. 
The kind of tape supports the normal tape, the chromium tape, and SA tape. 
The mechanical pause mechanism is carried. 
The soft ejection mechanism of an oil dumping system is carried. 
By connecting an optional audio timer, absence recording and an alarm clock play are possible. 
The lighting lamp is carried in a cassette case.  

Motor:  A DC servo motor with a built-in tachogenerator
1 x Rec/Play, (Hard permalloy head)
1 x erase, (Ferrite head)
Magnetic tape velocity:  4.8 cm/s
Fast forward / rewinding time:  It is C-60 tape and is about 90 seconds.
Wow and flutter:  0.07% (WRMS)
Frequency response:
30 Hz - 13 kHz (normal tape)
30 Hz - 16 kHz (chromium tape)
Signal to noise ratio:
56 dB or more at Dolby Out
64 dB or more at Dolby In
Equalizer curve damping time constant:
3,180 ms/120ms (normal tape)
3,180 ms/70ms (chromium tape)
Input sensitivity/impedance:
Mic: -70 dBV/1.8 kohm
Line: -20 dBV/80 kohm
An Output voltage/impedance:
Line: -7 dB /, 22 kohm
Headphone: -25 dBV/8 ohm
Power source:  AC, 100 -240 V, 50Hz/60Hz
Power consumption:  9W
Dimensions (W x H x D):  480 x 154 x 323 mm
Weight:  5,3 kg

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