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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Sony TC-K22



The Sony TC-K22 Stereo Cassette Deck provides the essentials of high-fidelity performance at a suprisingly attractive price. Incorporating Sony's advanced magnetic, mechanical, and electronic technology, the K22 achieves accurate reproduction of musical sound.
Super-High-Density Head
Tape deck performance begins with the record/play head. The K22 incorporates Sony's Super-High-Density (SD) permalloy head. The SD head provides high maximum flux density, for wide dynamic range when recording. High flux density is particulary important for the best performance with metal particle tape. In playback, the SD head's excellent linearity with small signals assures low distortion. Unlike conventional permalloy heads. Sony's SD formulation is remarkably resistant to wear. In addition to the Sd boasts a newly developed four-gap ferrite erase head. The four-gap design produces a strong, focused erasing field that penetrates the tape coating. The result is more complete erasure than the conventional, single-gap erase head, even with the difficult-to-erase metal tapes.



Dolby Noise Reduction
As you would expect, the K22 incorporates the Dolby noise reduction system, providing signal-to-noise ratio improvement of up to 10 dB at 5 kHz and above. A built-in filter prevents the standard 19 kHz FM pilot signal from interfering with the Dolby system when you record FM stereo broadcasts.
DC Servo Tape Drive
Because constant tape speed is vital to sonic clarity, teh TC-K22 incorporates Sony's Tri-Duty DC Servo Motor. As the motor turns a voltage generator reports any speed variations to servo-control electronics, which provides instantaneous correction. Thus, the K22 is less susceptible to the speed drift that commonly occurs as a cassette deck warms up. And the K22 maintains correct speed, even when the mechanical load on the drive system varies. In these respects, the TC-K22 is superior to many comparably-prieced cassette decks. The Tri-Duty motor is carefully sheathed in aluminum, steel, and rubber to dampen vibrations that might interfere with smooth tape travel. The motor, together with DC servo control and an oversize, dynamically balanced flywheel, assure stable tape travel, with wow and flutter of only 0,07% (WRMS).
For smooth transition to fast-forward and rewind modes, the Tri-Duty motor works in conjunction with a magnetic clutch assembly. Using the K22, you may go from play or fast-forward directly into rewind, and from rewind directly to fast-forward, without damage to the deck or the tape.
Precise Controls, Convenient Features
The layout and design of the TC-K22 permit simple, direct control of recording and playback. A four-position tape selector switch gives you the proper bias, record and playback equalization for each type of cassette, including the new metal particle tapes. Dual-concentric controls provide for quick adjustment of record levels. Levels are displayed on large, well-lit meters,accurately calibrated from -20 to +5 VU. At the end of tape, a motion sensor triggers the All-Mode Auto-Stop system, which disengages the heads, pinch roller, and drive capstan to protect the tape and mechanism. 



Specifications TC-K22
Fast-Forward/Rewind Time (C-60):  90 sec.
Wow and Flutter:  0,07% (WRMS);  0,20% (DIN 45507)
Frequency Response (-3 to +3 dB, Re: -20 dB):
Metalic Tape : 30 - 15,000 Hz
FeCr Tape : 30 - 15,000 Hz
EHF Tape : 30 - 14,000 Hz
SHF Tape : 30 - 12,000 Hz
Frequency Response at Re 0 dB:
Metallic Tape : 30 - 12,500 Hz
Signal-to-Noise Ratio (Dolby NR Off, Re: 3% THD, Peak, IHF-A weighted):
Metallic Tape : 58 dB
FeCr Tape : 58 dB
EHF Tape : 56 dB
SHF Tape : 52 dB
Improvement with Dolby NR On : Up to 5 dB at 1 kHz, 10 dB at 5 kHz or Above
Total Harmonic Distortion (1 kHz, Re: 0 dB Record Level):
Metallic Tape : 1,0%
FeCr Tape : 1,0%
Crosstalk (1 kHz, tracks):  60 dB
Separation (1 kHz, channels):  35 dB
Erasure (400 Hz, incl. Mettallic Tape):  60 dB
Bias Frequency:  105 kHz
Meter Range:  -20 , +5 dB
Line Input Sensitivity/Impedance:  77,5 mV/50 k Ohms
Mic Input Sensitivity/Impedance:  0,25 mV/Low
Line Output: Level, Fixed:  435 mV
Line Output: Load Impedance, Nominal:  50 k Ohms
Load Impedance, Minimum:  10 k Ohms
Headphone Output Level:  30,9 mV
Nominal Headphone Impedance :  8 Ohms
Power Requirements:  AC 120 V, 60 Hz
Power Consumption: 10 W max
Dimensions (W x H x D):  430 x 105 x 290 mm (17" x 4-1/8" x 11-3/8")
Weight:  4,5 kg (9 lbs, 15 oz) 



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