Audio Database

The

Technics ST-K808
66,000yen(around the 1980 time)

Description
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A Quartz synthesizer FM/AM tuner, and a microcomputer audio timer, the FM/AM tuner preamplifier which packed the preamplifier into one.

Multifunctional LSI including the Quartz synthesizer part which accumulated the element of 18000 on the one chip has controlled correctly the fluence of a music signal, the fluence of the control signal from a space control system, and all the on/off of a power source in an instant.

The Quartz synthesizer scheme which realized the high equivalent precision is adopted as a tuner part.
Moreover, presetting of eight FM/AM each is possible and functionalities, such as a battery back-up which protects the description of memory, and last one memory which the receiving station at the time of off can enjoy following the time of the power source on last time, are carried.

A timer programming of one operation and a total of three operations is possible for two operations and also one once specification for the everyday specification which operates a system at the time regular every day.

By a timer programming functionality, it is a programmable about a specification of on/off time, a selection of a music source, and tuning of a preset station at each three operation of an everyday once.

The clock call button which a current time can check is carried.

The preamplifier part is attaining low-noise-ization by study of an element or a circuit constant.

Mic mixing with each special-NetWare-program source is possible. Moreover, the mixing sound-recording output-terminal which can record the mixed voice as it is is carried.

It is combining with space control system SH-R808, and a stereo operation is possible at hand.


Rating of a mode
Form FM/AM tuner preamplifier
<FM tuner part>
Received frequency 76.1MHz - 89.9MHz
Practical speed 10.3dBf (0.9 microvolt, IHF'58)
SN ratio a sensitivity of 50dB mono: 18.5dBf (2.3 microvolts, IHF'58)
stereo: 38.9dBf (24 microvolts, IHF'58)
Distortion mono:0.2%
stereo:0.4%
SN ratio mono:75dB
Frequency characteristic 20Hz-15kHz+0.5 -1.5 dB
Effective selectivity 65dB
Capture ratio 1.0dB
Image stonewalling ratio 55dB(83MHz)
IF stonewalling ratio 85dB(83MHz)
Spurious stonewalling ratio 85dB(83MHz)
AM supression ratio 55dB
Stereo separation 45dB(1kHz)
35dB(10kHz)
Leakage carrier -35dB
<AM tuner part>
Received frequency 522kHz - 1611kHz
Practical speed 30 microvolts
Selectivity 35dB
Image stonewalling ratio 45dB
IF stonewalling ratio 45dB
<Preamplifier part>
Input sensitivity/impedance Phono: 2.5mV / 47kohm
TV, Tape:150mV /, 27kohm
Mic: 4mV / 10kohm
SN ratio Phono:78dB
TV, Tape: 97dB
Mic:75dB
Frequency characteristic Phono:RIAA}1.0dB
TV and Tape:10H-80kHz+0 -3 dB
Mic: 100Hz-20kHz+0 -3dB
Tone control Bass: }10dB (50Hz)
Treble: }10dB (20kHz)
Loudness control + 9dB (50Hz, VR-30dB)
Output voltage Output:500mV
<Timer part>
Clock functionality The Quartz type, a 24-hour window
Time precision From monthly difference 0 second to less than 10 seconds
Timer functionality A time programming of a 24-hour
everyday operation: 2 times
once operation: 1 time
Timer set time interval 1 minute - 23 hours and 59 minutes (1-minute space character)
Priority operation once, everyday2, everyday1
It is a priority operation at ‚̏‡.
Power-down build-out About three months
<Synthesis>
Power source AC100V, 50Hz/60Hz
Memory backup AA -- Battery SUM-3:1.5Vx3 piece
Power consumption 14W
Dimensions Width 430x height 76x depth of 310mm
Weight 4.4kg