Technics RS-640U
¥ 69,800 (around 1976)
Made In Japan
https: //audio-database.com/TechnicsPanasonic/player/rs-640u-e.html

Type Cassette deck
Tape drive system 1-motor belt drive system
Motor used Electronically controlled DC motor
Head Used Recording / reproducing : HPF head
For Erase : Double Gap Ferrite Head
Wow flutter 0.08%(WRMS)
Signal-to-noise ratio Dolby out:51dB
Dolby in : 5 kHz or more, 10 dB improvement
Frequency characteristic Normal : 30 Hz to 14 kHz
Chrome : 30 Hz to 16 kHz
Input Sensitivity / Impedance Mic : 0.3 mV (-70dB) / 600 Ω ~ 20k Ω
Line in:60mV(-24dB)
Output Level / Impedance Line out : 420 mv (-7.5 db) / 22k Ω or more
Headphone : 65mV/8 Ω
Semiconductor used Transistor : 37
FET : 2
IC : 2
Diode : 20 pcs
Other Semiconductors : 5 Pieces
Pwer 100 VAC, 50Hz/60Hz
Power consumption Approx. 8W
External dimensions Width 432x Height 130x Depth 301 mm
Weight Approx. 5.7 kg