TRIO WX-111
¥ 34,900 (around 1966?)
Commentary
AM/FM multi-stereo tri-amplifier equipped with a pure electronic FM mono ⇔ stereo automatic switching device in the FM section.
Equipped with an automatic switching device between FM mono and stereo. In the case of stereo broadcast transmission, the circuit is automatically switched.
Because the equipment is purely electronic, performance degradation due to aging is suppressed unlike mechanical switching systems.
The equalizer circuit uses full printed wiring, which was rare in vacuum tube type amplifiers at that time, and the heater uses full direct current ignition to improve S/N.
As a result, the internal hum of the vacuum tube, which is seen in the AC ignition system, is eliminated, and safety measures are taken against impacts during transportation.
We have developed and adopted an MPX noise filter that removes only noise without damaging the high frequency range.
The meter on the dial face does not change over time like the conventional magic eye and can be used semipermanently.
The FM AFC switch also eliminates the need to worry about the influence of ambient temperature changes and heat generation of the amplifier itself.
In order to cope with SCA broadcasting, a beat prevention circuit is mounted.
It is equipped with a special circuit to prevent beat interference even when FM multi-broadcasting is recorded.
In addition, it is equipped with a headphone jack, a dedicated screw terminal for body grounding, and a terminal for simultaneous recording.
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Model Rating
| Type | AM/FM Multi-Stereo Tri-Amplifier | ||||
| Tuner Section | |||||
| Receiving frequency | FM : 76 to 90 MHz AM : 535 to 1605 kHz |
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| Sensitivity (30% modulation) | FM : 2.5 μ V/84MHz (S/N 20 dB) AM : 20 μ V/1MHz (S/N 10 dB) |
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| Practical sensitivity (30% modulation) | FM : 5 μ V/84MHz (S/N 30 dB) | ||||
| Image ratio | FM : 30 dB or more (84 MHz) AM : 40 dB or more (1 MHz) |
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| FM frequency characteristics | 20 Hz to 20 kHz ± 1 dB | ||||
| Signal-to-noise ratio (1 input) | FM : 60 dB or more (100% modulation) AM : 45 dB or more (30% modulation) |
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| <FM Multi Section> | |||||
| Separation | 35 dB or More (400 Hz) | ||||
| Distortion factor | 1% or Less (400 Hz) | ||||
| <Audio section> | |||||
| Output (2% distortion factor) | Music Power : 14W (7W + 7W) Continuous output : 10W (5W + 5W) |
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| Frequency characteristic | 20 Hz ~ 20 kHz ± 1 dB (Output 500 mW) | ||||
| Input sensitivity (1 kHz input required for 5W output) | MAG:1.5mV AUX:220mV |
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| High filter | 10 kHz, -7dB | ||||
| Signal-to-noise ratio (maximum volume adjustment Tone control flat, output 5W) |
MAG : 50 dB or more AUX : 65 dB or more |
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| Residual noise (at minimum volume adjustment) | 3mV | ||||
| <General> | |||||
| Accessory circuit | Automatic switching device between FM mono and stereo FM AFC MPX Noise Filter Equalizer amplifier DC ignition Stereo headphone jack Stereo indicator |
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| Semiconductor used |
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| Pwer | 100 VAC / 117 V, 50Hz/60Hz | ||||
| Power consumption | 130W | ||||
| External dimensions | Width 420x Height 150x Depth 275 mm | ||||
| Weight | 10.5kg | ||||