Audio Database

The

ONKYO TA-9X
150,000yen(1981 release)

Description
 
The high-class stereo cassette deck which supplied all the state-of-the-art technologies of the cassette sound recording centering on the original auto accu-bias scheme of Onkyo, and was developed.

The closed-loop dual capstan scheme which arranges a 2-set Mino capstan and a pinch roller on both the sub-s of a head, and runs them a tapes is adopted.
Although the using of the head corresponding to metal which has the powerful hysteresis loop also in the case of two heads was difficult in space in order to use the large window of both right and left of a cassette half as an object for a drive in this system,The micro double gap metal erase head was developed, and this hangup is solved.

For a sound recording, S&S sender strike and sound-recording / play combination head designed in quest of a narrow gap, and a respectively ideal distortion and frequency characteristic is adopted as a head for a wide gap and a play.
It excels in magnetic property at core material, a sender strike with about the same hardness as a ferrite is used, and the performance of a metal tape is demonstrated.
Moreover, the micro head of the double gap which combined the dynalloy which is a newly developed material, and the ferrite is adopted as the head for an erasure, according to the erasure electric current from an oscillation block, a powerful magnetic field is made and the erasure functionality is made thoroughgoing.

3 motor system which adopted the high torque DC motor for exclusive use as the object for a capstan drive, the object for a reel drive, and the head base drive, respectively is adopted.
The brushless FG servo DC motor which has obtained the top-class validation by the silence and the stable swing of the rotation performance is used for the motor for a capstan drive, and the dual capstan scheme and the conjointly excellent wow and flutter are realized.
Furthermore, the full logic silence mechanism which controls an operation of a drive system intensively by computer is raising the run performance and the operationality.

Aiming at the top quality at the time of a sound recording, the best tuning of the bias value is carried out to one 1 tapes to be used, and the auto accu-bias scheme which acquires the flat frequency characteristic is developed and carried.
If a start button is pushed in a sound-recording pause, the mixed output of two oscillators, low-pass 400Hz of and 10kHz of high regions, will be recorded changing a bias value continuously. The compare search of low-pass and the high region level is carried out, carrying out the simultaneous play of this with three heads, and a bias value is locked at the point whose level corresponded. And a tapes is rewound by a nowait lock and the concurrent to a start location, and stands by in a sound-recording pause to them.
Bias tuning is usually completed in a short time for 5 or less (a maximum of 15 seconds) seconds,Furthermore, since memory of the best bias value is mechanically carried out when an accu-bias control thumb is operated after a completion of an auto accu-bias operation and an accu-bias indicator changes to red from green,It is possible to employ the effect of an auto accu-bias efficiently also in the case of an absence sound recording.

The real time counter which displays the residual quantity time and lapsed time of a tapes direct by switchpoint change (minute second) is carried.
Only from the sending side reel, rotational speed is detected also from the rolling-up side reel, with the dual sensor scheme which calculates residual quantity time by computer from both of rotational speed, the influence of the thickness of the tapes which changes with a brand or grade is prevented theoretically, and the time detection precision is raised.
Furthermore, in order to display residual quantity time within several seconds from every position under performance, it is effective also when beginning a sound recording on the tapes in the middle of rolling up. Furthermore, a residual quantity time window is continued during fast forward / rewinding as well as the time of a play run.
Although a residual quantity window switchpoint is three kinds of C-46/C-60/C-90, it can respond also to each tapes of C-50 (46 and 60), C-80 (60 and 90), and C-120 (46 and 90) by carrying out simultaneous push of any two.

Dolby C NR is carried and the high reduction effect in the required frequency band of a noise reduction has been acquired by making low a noise reduction operation start-up frequency compared with Dolby B.
Moreover, the slide band scheme to which a start-up frequency of operation is changed with the magnitude of input level is adopted. The bleeding event (a noise breathing event) which becomes so conspicuous that the amount of noise modifications becomes large is solved.
Furthermore, the exaggerated level in a high region is detected, the anti saturation circuitry which stops and records the high region of the Dainyuu power signal is built in, and the high region saturation level is substantially improved by returning at the time of a play.

Level adjusting is possible even when it is the tapes which contains the recording calibrator and in which a standard reference tape differs from a recording level.

If the auto space REC-Mute functionality is carried and an Auto-Space switchpoint is pushed during a sound recording, a unrecorded fraction will be automatically made for about 5 seconds, and sound-recording standby will be carried out by Rec-Pause.

The digital level indicator which uses 2 color FL tube is carried.
- With the wide-range type up to 20dB - +8dB, it has become with the seven-point peek hold (about 3 seconds) which can also read instantaneous peak value.

The timer standby organization is carried.

The 0:00 position memory stop & play after rewinding is possible.


Rating of a mode
Form Stereo cassette deck
Head Recording play: S&S sender strike recording-play pair head
Erasure: FX ferrite splicing type erase head
Motor For capstans: DC servo motor
For reels: DC motor
For the head bases: DC motor
Tape speed 4.8cm/s
Wow and flutter 0.019%(WRMS)
Frequency characteristic Metal: 20Hz - 20kHz (25Hz-19kHz±3dB)
High: 20Hz - 18kHz (25Hz-17kHz±3dB)
Norm: 20Hz - 16kHz (25Hz-15kHz±3dB)
SN ratio (Metal tapes) Dolby NR off:60dB
Dolby B NR on: The improvement in 10dB (5kHz)
Dolby C NR on: The improvement in 20dB (5kHz)
MIC input The minimum input level: 0.3mV/600 ohm
Input impedance: 5kohm
The conformity mic impedance 200 - 50kohm
LINE input The minimum input level: 50mV
Input impedance: 50kohm
LINE output Normal output: 1,100mV (0dB)
Load impedance: 50 or more kohms
Headphone 6mmphi standard stereo jack
Load impedance: 8ohms - 200ohms
Power consumption 45W
Dimensions Width 450x height 100x depth of 392mm
Weight 9.5kg