Technics ST-K808
¥ 66,000 (around 1980)
Commentary
FM/AM tuner preamplifier that combines a quartz synthesizer FM/AM tuner, a microcomputer audio timer, and a preamplifier into one.
The multi-functional LSI that integrates 18000 elements on a single chip, including the quartz synthesizer, controls the flow of music signals, the flow of control signals from the space control system, and the power on/off all in an instant and accurately.
The tuner section uses a quartz synthesizer system that achieves high equivalent accuracy.
In addition, 8 preset FM/AM stations can be set. It is equipped with functions such as battery backup to protect the contents of memory, and last one memory which can be enjoyed by the receiving station from the previous time when power is turned on.
Timer programming is available for a total of three operations : two operations for every day designation to operate the system at a fixed time every day and one operation for once designation.
The timer programming function allows you to specify the on/off time, select the music source, and select a preset station for each of the three every-once operations.
Equipped with a clock call button to check the current time.
The preamplifier section is designed to reduce noise by examining the elements and circuit constants.
Microphone mixing with each program source is possible, and the mixing recording output terminal is installed so that mixed sound can be recorded as it is.
When combined with the space control system SH-R808, stereo operation is available at hand.
Model Rating
| Type | FM/AM Tuner Preamplifier |
| FM Tuner Section | |
| Receiving frequency | 76.1 mhz to 89.9 mhz |
| Practical sensitivity | 10.3 dBf (0.9 μ V, IHF' 58) |
| SN ratio 50 dB sensitivity | Mono : 18.5 dBf (2.3 μ V, IHF' 58) Stereo : 38.9 dBf (24 μ V, IHF' 58) |
| Distortion factor | mono:0.2% stereo:0.4% |
| Signal-to-noise ratio | mono:75dB |
| Frequency characteristic | 20 Hz ~ 15 kHz + 0.5 -1.5 dB |
| Effective selectivity | 65dB |
| Capture ratio | 1.0dB |
| Image interference ratio | 55dB(83MHz) |
| IF interference ratio | 85dB(83MHz) |
| Spurious interference ratio | 85dB(83MHz) |
| AM suppression ratio | 55dB |
| Stereo separation | 45dB(1kHz) 35dB(10kHz) |
| Leak carrier | -35dB |
| <AM Tuner Section> | |
| Receiving frequency | 522 kHz to 1611 kHz |
| Practical sensitivity | 30 μ V |
| Selectivity | 35dB |
| Image interference ratio | 45dB |
| IF interference ratio | 45dB |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono : 2.5mV/47k Ω TV, Tape : 150mV/27k Ω Mic : 4mV/10k Ω |
| Signal-to-noise ratio | Phono:78dB TV, Tape : 97 db Mic:75dB |
| Frequency characteristic | Phono : RIAA ± 1.0 dB TV, Tape : 10H ~ 80 khz + 0 -3dB Mic : 100 Hz ~ 20 kHz + 0 -3dB |
| Tone control | Bass : ± 10 dB (50 Hz) Treble : ± 10 dB (20 kHz) |
| Loudness control | + 9 dB (50 Hz, VR-30dB) |
| Output voltage | Output:500mV |
| Timer Section | |
| Clock function | Quartz system, 24 hour display |
| Time accuracy | Monthly difference between 0 seconds and 10 seconds |
| Timer function | 24-hour time programming Everyday behavior : 2 times Once operation : once |
| Timer set time interval | 1 min ~ 23 hours 59 min (1 minute interval) |
| Priority action | Once, everyday2, everyday1 Priority Actions |
| Power failure compensation | About 3 months |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Memory backup | AA Dry Battery SUM-3 : 1.5Vx3 Pieces |
| Power consumption | 14W |
| External dimensions | Width 430x Height 76x Depth 310 mm |
| Weight | 4.4kg |