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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





Cyrus Tuner mkI

The advent of digitally synthesised tuners has substantially improved the reception quality of FM broadcasts. A few problems however continue to persist in the design of most Fm tuners. The most serious of these problems we consider to be sibilance in high frequencies and poor low-frequency performance. It is common knowledge that the low-frequency performance of tuners lacks authority, control, definition, and articulation - especially when compared to the latest generation CD players.
The objectives of Cyrus Electronics have been to produce an outstanding tuner where the FM section does not suffer the nagging problem of "spitting" sibilance, and to give bass notes their rightful and necessary musical weight, tempo, and authority. The Cyrus Tuner is manufactured in a case of identical dimensions and appearance to the rest of the Cyrus range, and will suit the requirements of the perfectionist audiophile who owns either a Cyrus One or a Cyrus Two.
The design is based on microprocessor controlled digital frequency synthesised tuning,, and provides 19 FM and 9 MW preset with C-MOS memory back-up. The unit provides variable speed up/down scanning, automatic search, as well as manual tuning. Automatic FM mute is provided to eliminate irritating interstation noise. Quartz-locked tuning system is adopted for ultimate tuning accuracy and minimal frequency drift. An informative Fluorescent Tube Display electronically generates digital frequency readout, "Tuning " indication, "Stereo" reception and, when selected, preset channel number. For finest reception quality under adverse signal conditions the Cyrus Tuner has FET front-ends (dual-gate with automatic gain control on FM). The FM mixer oscillator is buffered to ensure high immunity to interference, and Ceramic filters are incorporated for high selectivity on both AM and FM wavebands. The Cyrus Tuner offers "Sliding Stereo" decoder maintaining full channel separation on strong signals, and changing gradually to mono for fullest noise suppression on weak signals. PLL decoder circuitry produces a stable audio signal with optimum channel separation, and an SISC filter cuts out interference on stereo broadcasts.

Specifications
FM Section
Frequency Range:  87,5 - 108 MHz
Frequency Response:  20 Hz - 15 kHz ±1 dB
Audio Output:  1 V RMS
Sensitivity (75 Ω input)
Mono :  0,8 µV (26 dB s'n)
Stereo ;  18 µV (46 dB s'n)
Selectivity:  72 dB
IF Suppression:  100 dB
Image Frequency Suppression:  57 dB
Pilot Tone Suppression:  43 dB
Stereo Separation (1 kHz):  36 dB
Signal-to-Noise Ratio
Mono :  73 dB
Stereo :  71 dB
Total Harmonic Distortion
Mono :  0,15%
Stereo ;  0,4%
Aerial Input:  75 Ω coaxial
AM Section
Frequency Range:  513 - 1611 kHz (186 - 584 m)
Audio Output:  0,3V RMS
Sensitivity:  130 µV (26 dB s'n)
Selectivity:  58 dB
MF Suppression 52 dB
Image Frequency Suppression:  58 db
Aerial Input:  External loop Aerial and External Connection Socket
Dimensions (W x H x D):  215 x 85 x 340 mm
Weight: 2 kg
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