TRIO KT-5000
¥ 39,500 (around 1969)
Commentary
AM/FM tuner developed by putting together the best of the tuner technology of Trio.
Two FETs are used for the high frequency stage of the FM front end and the mixer.
Since the RF gain is sufficient, it is highly sensitive, and the image ratio and cross-modulation can be greatly improved. In addition, the SN is also improved because the RF amplifying FET is selected to be low in noise.
A mechanical filter is used in the IF circuit to improve the interference ratio and selectivity.
In order to receive FM broadcasting accurately, a two meter tuning system is adopted.
One is a signal meter that shows the strength of the radio wave, and the other is a center tuning meter that correctly tunes to the center of the discriminator (frequency discriminator) and indicates the point of minimum distortion.
Equipped with level volume, output level can be adjusted.
It is equipped with functions such as FM muting to remove inter-station noise and FM stereo noise filter.
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Model Rating
| Type | Solid State FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Sensitivity (IHF) | 1.7 μ V |
| Distortion factor | 0.5% or less (400 Hz, 100% modulation) |
| Signal-to-noise ratio | 60 dB or More (100% Modulation, 100 μ V Input) |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -2dB |
| Frequency drift | Not more than 0.02% |
| Capture ratio | 2.5 dB or less |
| Image ratio | 90 dB or more |
| Spurious response | 90 dB or more |
| IF Rejection | 85 dB or more |
| Selectivity | 50 dB or more |
| AM suppression | 45 dB or more |
| Stereo separation | 35 dB or More (400 Hz) |
| Rated output | 1 v (400 Hz, 100% modulation) |
| Antenna input impedance | 300 Ω equilibrium 75 Ω unbalance |
| <AM Tuner Section> | |
| Receiving frequency | 520 kHz to 1610 kHz |
| Sensitivity (IHF) | 15 μ V |
| Image ratio | 70 dB or more |
| Selectivity | 25 dB or more |
| IF Rejection | 65 dB or more |
| Signal-to-noise ratio | 45 dB or More (30% Modulation, 1 mV Input) |
| Rated output | 0.33 V (400 Hz, 30% modulation) |
| Output impedance | 330 Ω (Maximum Output Value) |
| <General> | |
| Accessory circuit | FM mono to stereo automatic switching device FM stereo indicator FM muting FM stereo noise filter Low-impedance output circuit Tape recording terminal Mono output terminal AM bar antenna Signal meter FM center tuning meter SCA Filters Mechanical filter Level adjustment volume |
| Semiconductor used | Transistor : 19 FET : 2 IC : 2 Diode : 26 Units |
| Power supply voltage | 100 VAC / 117 V, 50Hz/60Hz |
| Rated power consumption | 15W |
| External dimensions | Width 408x Height 134x Depth 280 mm |
| Weight | 6.4kg |