TRIO ST-750X
¥ 85,900 (around 1966)
Commentary
A stereo component that combines a tri-amp compatible with FM multi-broadcasting and a player equipped with an auto mechanism.
Receiver section
Equipped with a terminal that can be recorded and replayed by a tape recorder.
It is also equipped with functions such as loudness control.
DC ignition is used for the equalizer circuit.
The FM tuner section is equipped with an automatic switching device between FM mono and stereo.
Player part
There are three practical auto mechanisms in the player part.
Equipped with a tri-auto start mechanism and auto-stop mechanism that automatically turn on / off the power of the motor, raise / lower the arm, and drive / pause the idler, as well as a full stop mechanism that automatically turns off the power of the amplifier at the end of the performance and puts the entire stereo into pause.
A MM type cartridge is used.
A pipe arm is used for the tone arm.
Speaker part
2-way 3-speaker configuration.
Two 16 cm cone units are installed in the low range, and a 7 cm cone tweeter is installed in the high range.
The network is an LC type.
The enclosure uses a bass reflex system.
Model Rating
| Type | Stereo component | |
| Receiver Section | ||
| Tuner Section | ||
| Receiving frequency | FM | 76 MHz to 90 MHz |
| AM | 535 kHz to 1,605 kHz | |
| Sensitivity | FM | 2.5 μ V/84MHz (30% modulation, S/N20dB) |
| AM | 20 μ V/1MHz (30% modulation, S/N10dB) | |
| Image ratio | FM | 30 dB or more |
| AM | 40 dB or more | |
| Frequency characteristic | 20 Hz ~ 20 kHz ± 1 dB (FM) | |
| Signal-to-noise ratio | FM | 60 dB or More (100% modulation, 1 mV input) |
| AM | 45 dB or More (30% Modulation, 1 mV Input) | |
| Separation | 35 dB or More (400 Hz) | |
| Distortion factor | 1% or Less (400 Hz) | |
| Amplifier Unit | ||
| Output | 14W (7W + 7W, music power, 2% distortion) | |
| Frequency characteristic | 20 Hz ~ 20 kHz ± 1 dB (Output 500 mW) | |
| Input sensitivity (1 kHz input required for 5W output) | MAG:1.5mV Aux:250mV |
|
| SN ratio (volume adjustment maximum, tone control flat, output 5W) | MAG : 55 dB or more Aux : 65 dB or more |
|
| Residual noise | 3 mv (Volume Adjustment Minimum, 8 Ω) | |
| Entire Receiver Section | ||
| Accessory function | FM mono-stereo automatic switching device FM stereo display lamp Multi-stereo noise filter FM-AFC Tape recording terminal Stereo headphone jack |
|
| Used vacuum tubes, etc. | 14-ball 8-diode | |
| Pwer | 100 VAC, 50Hz/60Hz | |
| Power consumption | 125VA | |
| <Player Part> | ||
| Model Name | ST-750P | |
| Cartridge Section | ||
| Cartridge | MM Type | |
| Needle tip | 0.7 mil diamond needle | |
| Output voltage | 5 mv (1 khz, 5cm/s) | |
| Frequency characteristic | 20 Hz to 20 kHz ± 2 dB | |
| Separation | 25 dB or more | |
| Output voltage difference | Within ± 1 dB | |
| Needle pressure | 3-4g | |
| <Turntable portion> | ||
| Drive motor | 4-pole synchronous motor | |
| Turntable | 25cm | |
| Number of revolutions | 33 1/3, 45, 78 rpm | |
| Wow | Not more than 0.25% | |
| Tone Arm Section | ||
| Format | Static balanced type pipe arm | |
| Speaker Unit | ||
| Model Name | ST-750XS | |
| Method | 2-Way, 3-Speaker, Bass Reflex System, Floor Type | |
| Units Used | For low band : 16 cm cone x2 For high range : 7 cm cone type |
|
| Frequency characteristic | 45 Hz to 20 kHz | |
| Maximum instantaneous input | 7W | |
| Crossover frequency | 5kHz | |
| Enclosure | Distributed port system | |
| <General> | ||
| External dimensions | Width 1,380x Height 730x Depth 420 mm | |
| Weight | 53kg | |