ONKYO TA-640
¥ 69,800 (around 1979)
Commentary
Stereo cassette deck for metal tape.
An S & S (Sendust & Sendust) head has been developed and incorporated into the recording / reproducing head in order to be compatible with metal tape.
SENDUST is an alloy (alloy of iron, nickel, and aluminum) that has excellent physical properties as a magnetic material. Compared with permalloy and ferrite, SENDUST has a higher magnetic saturation point and can achieve a larger maximum magnetic flux density. In addition, SENDUST has excellent processing accuracy and sufficient hardness.
Double-gap ferrite head has been adopted for the erasing head, and it is compatible with metal tape with high holding power.
It uses a soft touch type operation button with logic control. In addition, it uses a direct change method that can be directly operated without going through the STOP position for switching from Play to FF or REW, or from RE to FF, etc. to different functions.
FL fluorescent display tube is used for the level display.
The peak value can be easily seen by adjusting the attack time of the rising edge faithfully to the input signal and by providing an appropriate time constant for the recovery time of the falling edge.
Double belt drive system using FG / DC servo motor for the drive part.
Precision finished flat belt is used for the main belt to improve the tape running characteristics.
It is equipped with Dolby noise reduction circuit, equalizer / bias simultaneous 3-stage switching, timer recording and timer playback mechanism which can be used for absence recording, soft ejection system by air dump braking, headphone output which supports both low and high impedance, and full autostop mechanism which protects equipment by being mechanically free at the tape end.
By using the separately sold dedicated remote control unit, it can be operated from a remote location.
Model Rating
Type | Stereo cassette deck |
Track format | 4-track 2-channel stereo |
Recording system | AC bias |
Erasing method | AC Erase |
Tape speed | 4.8cm/s |
Wow flutter | 0.045%(W.R.M.S.) |
Frequency characteristic | 20 Hz ~ 19 kHz (Metal Tape) 20 Hz ~ 17 kHz (High Position Tape) 20 Hz ~ 15 kHz (Normal Tape) |
Signal-to-noise ratio | 58 dB or More (Metal Tape) Dolby in : 5 dB at 1 kHz, 10 dB or more at 5 kHz |
Overall strain rate | 1.0% or less (0 VU, Normal, 1 kHz) |
Minimum input level | Microphone : 0.3mv/600 Ω Line : 50 mV |
Input impedance | Microphone : 5k Ω (Compatible impedance 200 Ω ~ 50k Ω) Line : 50k Ω |
Reference output | Line : 480 mv (0 VU) |
Load impedance | Line : 50k Ω or more Stereo headphones : 8 Ω ~ 200 Ω |
Motor | FG / DC servo motor |
Heads | Recording : SENDUST S & S Head Erasing : double-gap ferrite heads |
Pwer | 100 VAC, 50Hz/60Hz |
Power consumption | 25W |
External dimensions | Width 418x Height 120x Depth 330 mm |
Weight | 6.4kg |
Sold Separately | Remote Control Unit RC-5 (¥ 9,800) |