Technics ST-3400
¥ 45,000 (around 1973)
Commentary
FM/AM tuner incorporating a new mechanism based on ST 3600 technology.
Equipped with a distortion null meter.
This meter shows the minimum point of distortion only when it comes to the perfect tuning point, regardless of whether the input is large or small. The tuning point can be easily selected simply by searching for the point where the deflection of the needle is maximum.
Equipped with a multi-path meter that allows you to select the optimum antenna direction.
When the selector switch is set to Multi-Path, the distortion null meter becomes a multi-path meter so that the optimum direction of the antenna can be found by observing the deflection of the meter.
Four 2-element ceramic filters and eight LC filters are used in the IF stage, and eight stage amplification including a differential limiter is used.
In order to further improve accuracy, temperature characteristics, and high-frequency current path, all related parts have been renewed, and a new 4-series variable capacitor (7-series variable capacitor for AM use) has been developed and adopted.
The FM front end is an RF2-stage amplifier circuit using two 4-pole MOS FETs.
In addition to the high input impedance, the 4-pole configuration reduces harmful feedback and provides a stable high gain.
A zener diode is used for the FM station output circuit to stabilize the power supply voltage.
Uses a muting circuit that uses 2 LC filters.
Equipped with FM MPX OUT terminal, 4-channel decoder can be connected.
The AM section uses a 3-row varicon with RF amplification.
.JPG)
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Sensitivity (IHF) | 1.7 μ V |
| Selectivity (IHF) | 65dB |
| Image ratio | 100dB |
| IF interference ratio | 100dB |
| Spurious interference ratio | 100dB |
| Capture ratio | 1.5dB |
| AM suppression ratio | 50dB |
| Stereo separation | 40dB(1kHz)30dB(10kHz) |
| I-harmonic distortion factor (100% modulation, 400 Hz) | mono:0.3% stereo:0.5% |
| SN ratio (IHF, 100% modulation) | mono:70dB stereo:57dB |
| Frequency characteristic | 40 Hz to 13,000 Hz ± 0.5 dB |
| Antenna | 300 Ω equilibrium 75 Ω unbalance |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1605 kHz |
| Sensitivity (IHF) | 15 μ V |
| Selectivity | 30 dB (1000 kHz ± 10 kHz) |
| Image Ratio (1000 kHz) | 100dB |
| IF Disturbance Ratio (1000 kHz) | 80dB |
| Harmonic distortion factor (30% modulation, 400 Hz) | 1% |
| SN ratio (30% modulation, 400 Hz) | 40dB |
| Antenna | Ferrite bar antenna External antenna terminal |
| <General> | |
| Functions | Program Selector : FM mono/FM Auto/AM/Multi Path FM stereo eye Signal strength meter Combined distortion null and multi-pass meter FM muting High blend switch Output level adjustment knob MPX-OUT connector Recording output terminal Dial Travel Distance 220 mm |
| Semiconductor used | FET : 2 Transistor : 36 Diode : 37 pcs |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 17W |
| External dimensions | Width 410x Height 140x Depth 300 mm |
| Weight | 8.1kg |