TRIO ST-830X
¥ 105,000 (around mid 1960 s?)
Commentary
Stereo component for FM Multi (FM stereo broadcast transmission).
Receiver section
The tuner section is equipped with an FM multi-circuit, a stereo monitor to distinguish between mono and stereo, and a tuner function such as FM AFC to prevent mistuning.
The amplifier section uses a fully DC ignition circuit to prevent hum noise, and is equipped with functions such as loudness control, high filter and tape recording terminal.
Player part
The record player is equipped with a unique tri-auto system that can perform three operations by simply operating a single lever. One lever can be used to turn the power on - idler into drive position, turn the turntable - arm down and start playing.
A high-compliance magnetic cartridge is used.
Also, a static balance type pipe arm is adopted for the tone arm.
Speaker part
The speaker section is a 3-way configuration, with a 20 cm cone woofer in the low range, a 7.5 cm cone squaker in the middle range, and two 5 cm cone tweeters in the high range.
The L/C system is used for the speaker network.
Model Rating
| Type | Stereo component | ||
| Tuner Section | |||
| Receiving frequency | FM : 76 MHz to 90 MHz AM : 535 kHz to 1,605 kHz |
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| Sensitivity | FM : 2.5 μ V/84MHz (S/N20dB, 30% modulation) AM : 30 μ V/1,000 kHz (S/N30dB, 30% modulation) |
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| Image ratio | FM : 30 dB or more AM : 40 dB or more |
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| Frequency characteristic | FM : 20 Hz to 20 kHz (within 1 dB) | ||
| <FM Multi Section> | |||
| Separation | 35 dB or More (400 Hz) | ||
| Distortion factor | 1% or less (400 Hz, 100% modulation) | ||
| Amplifier Unit | |||
| Music power | 28W (14Wx2, 1% distortion factor) | ||
| Continuous output | 20W (10Wx2, 1% distortion factor) | ||
| Gain (input voltage required for each output 8W) | MAG:3mV Xtal:30mV Aux:500mV |
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| Tone control | Bass : + 7 dB ~ -8dB (50 Hz) Treble : + 6 dB to -8dB at 10 kHz |
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| High filter | 10kHz:-12dB | ||
| Residual noise (volume control maximum, tone control flat) | MAG:20mV Xtal:20mV Aux:4mV |
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| Input terminal | MAG, Xtal, Aux | ||
| Output impedance | 8 Ω | ||
| Accessory circuit | Earphone jack (L/R) Tape Rec connector |
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| Entire Receiver Section | |||
| Pwer | 100 VAC, 50Hz/60Hz | ||
| Power consumption | 150W | ||
| Used vacuum tubes, etc. |
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| <Player Part> | |||
| Tone arm | Static balanced type pipe arm | ||
| Phono motor | 4-pole synchronous motor | ||
| Number of revolutions | 16 2/3, 33 1/3, 45, 78 rpm | ||
| Turntable | 25 cm Aluminum Alloy Made | ||
| Wow | Not more than 0.25% | ||
| Pwer | 100 VAC, 50Hz/60Hz | ||
| Power consumption | 15W or less | ||
| Weight | 4.8kg | ||
| Attachment | Capstan Strobe EP Adapter Needle pressure meter Sewing machine oil Cushion spring Mounting mount Small screwdriver Decorative ribbon |
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| Cartridge Section | |||
| Type | MM Type | ||
| Frequency characteristic | 20 Hz to 20 kHz ± 2 dB | ||
| Crosstalk | 20 dB or More (1 kHz, 5cm/s) | ||
| Output voltage difference | Within ± 1 dB (1 kHz) | ||
| Needle tip | 0.7 mil diamond needle | ||
| Needle pressure | 3g ~ 4g | ||
| Speaker Unit | |||
| Method | 3-Way, 4-Speaker, Bass Reflex System, Floor Type | ||
| Units Used | For low band : 20 cm cone type For Medium Range : 7.5 cm Cone Type For High Pass : 5 cm cone x2 |
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| Max Input | 15W | ||
| Frequency characteristic | 45 Hz to 20 kHz | ||
| Crossover frequency | 2.5 kHz, 5 kHz | ||
| Impedance | 8 Ω | ||
| External dimensions | Width 460x Height 780x Depth 400 mm | ||
| Weight | 13.5kg | ||
| Attachment | Speaker cord with both pins | ||
| Center Case Portion | |||
| External dimensions | Width 494x Height 780x Depth 400 mm | ||
| Weight | 23.5 kg (including amplifier) | ||
| <Others> | |||
| External dimensions | Width 1414x Height 780x Depth 400 mm | ||
| Weight | 55.3kg | ||