Description
SONY TC-KA7ES cassette deck AC100V Working Properly FROM JAPAN USEDDescription model cassette deckFormat 4 tracks 2 channelsHead Erase: 1Recording: 1Playback: 1Motor Linear Torque BSL D.D. Motor: 1DC motor: 2SN ratio 57dB (EIAJ, Dolby NR off, metal tape)80dB (Dolby NR S, peak level, metal tape, hearing correction)Frequency response 15Hz-22kHz ±3dB (EIAJ, -20dB recording, metal tape)15Hz-16kHz ±3dB (-4dB recording, metal tape)wow flutter(EIAJ) ±0.04% Wpeak0.022% WRMSDistortion (EIAJ) 1.3% (third harmonic distortion, standard recording level 250nWb/m, 315Hz sine wave, metal tape)Power supply voltage AC100V, 50Hz/60HzPower consumption 27WDimensions Width 430x Height 135x Depth 380mmWeight about 12kg As a reference model of the new ES series, a cassette deck with thoroughly refined circuits/structures/devices. The capstan motor adopts a direct drive system by a three-phase BSL motor with little rotation unevenness.Furthermore, wow and flutter are reduced by sandwiching the tape between two sets of capstans and pinch rollers and adopting a closed-loop dual capstan system that suppresses modulation noise. The Lapis (sapphire capstan base) method using sapphire with high hardness and low friction coefficient is adopted for the bearing of the capstan motor, and stable running accuracy is maintained for a long period of time.Especially in TC-KA7ES, in addition to the take-up (winding) side, it is also used for the supply (sending) side capstan. Dolby SNR is carried as a noise reduction system. The tape noise is reduced to about 1/16 by introducing the Dolby SR technology used in professional equipment and performing precise signal processing.Furthermore, the breathing phenomenon peculiar to NR is suppressed by finely controlling the volume and pitch of the sound. The R core transformer is adopted as a power-source part. The TC-KA7ES uses independent R-core transformers for the control system and the audio system, and furthermore, the shield case is filled with resin to suppress magnetic flux leakage and vibration. The audio circuit is laid out along the flow of the signal as much as possible. Furthermore, mutual interference is suppressed by putting together the recording amplifier and the playback amplifier on independent boards. The FB chassis is adopted as the chassis structure. A metal material with sufficient strength and thickness is used, and the entire chassis is solidified as a single box with a frame surrounding the outer periphery and beams that extend back and forth. In addition, by combining members with different shapes and sizes, the natural vibrations are mutually canceled, and the vibration of the chassis as a whole is greatly reduced.In addition, the TC-KA7ES suppresses the generation of electromagnetic noise by applying copper plating. By using single-crystal oxygen-free copper ESC-OCC wires with a purity of 99.997% or higher throughout the circuit, high-quality and pure transmission are achieved. An eccentric insulator is used in which the position of the mounting hole to the chassis is offset from the center, so that the signals transmitted from the outside cancel each other out, making it difficult for them to be transmitted to the chassis. The position and diameter of the holes have also been examined through repeated trial production and listening, and are tuned to be effective in damping the vibration components in the mid- and high-range that affect hearing.In particular, the TC-KA7ES uses cast iron eccentric insulators that are more vibration resistant. A 6N winding laser amorphous head that uses 6N material with a purity of 99.9999% is used for the winding of the laser amorphous head.In addition, the shield case is gold-plated to eliminate the weak vibrations that the head receives. The cassette half is equipped with a pad to press the tape against the head, but with the closed-loop dual capstan method, this pressure is extra, and there was a problem of increasing the modulation noise.In order to improve this, a pad pressure reduction mechanism is adopted in which slight convex protrusions are provided above and below the head gap to release the pressure of the pad. The super bias is adopted and the interference which a bias gives to an audio signal is suppressed by separating the frequency of a bias signal from an audio signal band. The TC-KA7ES suppresses beat noise and intermodulation distortion by raising the bias frequency to 210kHz. By installing a buffer amplifier that lowers the output impedance just before the output terminal, it is less likely to be affected by the superiority or inferiority of the pin code used to connect to the amplifier. A mid-ship drive system is adopted in which a heavy power transformer and mechanical deck are placed in the center of the chassis, and a control circuit and an audio circuit are arranged on the left and right sides. The weight is well balanced on the four legs, making it stable and resistant to external vibrations. The rigid half hold mechanism is adopted in order to prevent the vibration and sound pressure which a cassette half receives directly.In addition to the cassette holder that uses a fine ceramic composite material with high vibration resistance and the cassette stabilizer that uses Sorbothane, which has excellent vibration damping properties, the cassette holder that was previously locked on one side has been changed to a dual lock that locks on both sides. Furthermore, in order to ensure the effect of the cassette stabilizer, the tape is fixed more reliably by a delayed action stabilizer mechanism in which the stabilizer is crimped to the half after the cassette lid is closed. Dolby HX-PRO is carried.High frequency linearity is maintained by controlling the bias current in 1/1000 second units according to the frequency and level of the signal. A 3-point REC calibration function with a built-in oscillator is provided in order to realize recording that makes the most of the ability of the tape.By expanding the adjustment by the internal oscillator which was 2 points conventionally to 3 points of 400Hz/3kHz/15kHz, it has come to be able to match with the characteristic of a tape more finely. The FL linear counter with a subtraction function is carried. If a play button is pushed, the auto-monitor functionality which changes a monitor sound automatically from a source to a tapes will be carried.Manual switching is also possible. The multi-AMS functionality which can cue 30 music before and after on the basis of music under reproduction is carried. There were two color variations, gold and black.Shipping FedEx?or DHLInternational Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. Thank you for your understanding.
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