Technics RS-M20
¥ 49,800 (around 1978)
Commentary
A stereo cassette deck equipped with Dolby NR circuit and BIAS/EQ independent 3-stage switching mechanism.
An electronically controlled DC motor is used drive motors.
A vertical hold system is adopted for the tape travel system.
A high-precision flywheel with a diameter of 83.5 mm and dynamic balance of 1g ・ cm or less is adopted. In addition, a spring is provided to suppress thrust play in one direction to stabilize tape running.
LH head is adopted for the head.
As a noise reduction system, Dolby NR circuit is mounted.
This circuit has a built-in MPX filter to remove the pilot signal cause problems during FM air check.
It is equipped with a switching function of 3 stages of bias and 3 stages of equalizer in order to support various commercially available tapes.
It is equipped with Q & Review mechanism and Quick Review mechanism.
Equipped with a full auto-stop mechanism that does not burden the mechanism at the time of rewind and FF.
Equipped with timer standby mechanism, you can record absence by connecting an optional timer.
Equipped with a rewind autoplay mechanism.
Model Rating
| Type | Stereo cassette deck |
| Head configuration | Recording / Reproducing : LH Head For Erase : Double Gap Ferrite |
| Motor used | Electronically controlled DC motor |
| Recording bias system | AC bias system |
| Erase Method | AC erasing system |
| Frequency characteristic | Normal : 20 Hz to 14 kHz CrO2 : 20 Hz to 16 kHz |
| Signal-to-noise ratio | 57 dB (XA tape, peak level) Dolby NR in : 10 db improvement (5 khz) |
| Wow and flutter | 0.06%WRMS |
| Input Sensitivity / Impedance | Mic : 0.25 mV (-72dB) / 400 Ω ~ 20k Ω Line in:60mV(-24dB) |
| Output Level / Impedance | Line out : 420 mv (-7.5 db) / 47k Ω or more Headphone : 60mV/8 Ω |
| Semiconductor used | Transistor : 21 IC : 6 Diode : 11 units |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 10W |
| External dimensions | Width 430x Height 149x Depth 267 mm |
| Weight | Approx. 7.2 kg |