TRIO AFX-21T
¥ 28,900 (around 1967)
Commentary
Solid state AM/FM tuner incorporating AM tuner into FX-11T FM stereo tuner.
The front end is an all-transistor type that does not use vacuum tubes or new vistas.
As a result, the circuit does not generate heat like a vacuum tube and is stable.
Selectivity is improved by the combination of all-transistor-type 3-row varicon front end and IF5-stage amplification.
In addition, the noise limiter, which cuts out external noise, is a full-scale one with three stages.
Equipped with TRIO's own FM mono to stereo automatic switching device, it automatically receives stereo broadcast transmission.
In addition, an FM stereo indicator lamp is installed to indicate whether the broadcast being received is stereo or not.
The AM section has improved its sensitivity by using a high-sensitivity bar antenna.
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Model Rating
| Type | Solid State AM/FM Stereo Tuner |
| Tuner Section | |
| Receiving frequency | FM : 76 MHz to 90 MHz AM : 520 kHz to 1610 kHz |
| Sensitivity (30% modulation) | FM : 1.9 μ V/84MHz (S/N 20 dB) AM : 6.0 μ V/1MHz (S/N 10 dB) |
| Practical sensitivity (30% modulation) | FM : 2.5 μ V/84MHz (S/N 30 dB) |
| Image ratio | FM : 65 dB or more AM : 40 dB or more |
| Frequency characteristic | FM : 20 Hz to 20 kHz ± 0.5 dB |
| Signal-to-noise ratio | FM : 60 dB or more (100% modulation, 100 μ V input) AM : 45 dB or more (30% modulation, 1 mV input) |
| FM distortion | Not more than 0.7% |
| <FM Multi Section> | |
| Separation | 35 dB or More (400 Hz) |
| Distortion factor | Not more than 1% |
| Carrier leak | -45dB or less (100% modulation) |
| <General> | |
| Input impedance | FM : 300 Ω Balanced Type |
| Output voltage | FM : 2 v (400 Hz, 100% modulation) AM : 0.4 v (400 Hz, 30% modulation) |
| Output impedance | 1k Ω |
| FM frequency drift | Not more than 0.02% |
| Accessory circuit | Automatic switching device between FM mono and stereo New MPX noise filter Low-impedance output circuit FM3-stage limiter FM stereo display lamp AM ferrite antenna SCA Filters |
| Semiconductor used | Transistor : 21 Diode : 20 pcs |
| Pwer | 100 VAC / 110 V, 50Hz/60Hz |
| Power consumption | 15W |
| External dimensions | Width 330x Height 105x Depth 237 mm |
| Weight | 4.2kg |