SANSUI TU-555
¥ 28,900 (released in June 1968)
Commentary
FM/AM tuner using FET and 3-row varicon.
The FM front-end uses a 3-row varicon and FET in the RF stage to achieve high sensitivity.
The AGC circuit also improves the selectivity in a strong electric field.
The 4-stage IF amplifier and 3-stage limiter circuit provide a sufficient limiter effect, making it easy to receive signals in noise-prone areas and low-voltage areas in remote mountainous areas.
The power supplies for the FM front end, FM and AM sections are stabilized by a zener diode.
In particular, we have succeeded in eliminating the AFC circuit by fully compensating the temperature of the front-end station and minimizing the drift of the station station by stabilizing the power supply.
The FM multi-circuit employs a switching system with high stability and reliability.
The noise canceler replaces the conventional high-cut method and uses a method that can remove only the noise at the time of stereo reception without cutting the high-frequency audible range.
It is equipped with a muting switch that eliminates noise between stations and enables quiet channel selection.
An amplifier for meter and muting is specially installed, and a large meter is used for tuning instruction to make the pin-point tuning circuit easy to see.
For this reason, the center of the radio wave can be surely adjusted by making the tuning point sharp.
It is equipped with a pure electronic FM stereo / mono switching circuit. With FM-AUTO, when FM broadcasting changes from mono to stereo, the electronic switch automatically operates.
In addition, it is equipped with a stereo indicator that can confirm the stereo broadcast transmission.
Equipped with 300 Ω and 75 Ω 2-branch impedance terminals.
Since the FM antenna is equipped with both short-range and long-range attenuators, distortion-free reception is possible even in high-field areas.
The AM antenna uses a high-sensitivity ferrite bar antenna.
External antennas can also be used.
The output circuit is equipped with a switch capable of switching between High and Low levels so that it can be connected to any amplifier.
It also has a separation adjuster for FM multiplex.
There was a special wood case sold separately.
Model Rating
Type | FM/AM Tuner |
<FM Part> | |
Receiving frequency | 76 MHz to 90 MHz |
Sensitivity | 2 μ V ± 3 dB (20 dB quieting) 2.5 μ V ± 3 dB (IHF) |
Harmonic distortion factor | Not more than 0.8% |
Signal-to-noise ratio | 60 dB or more |
Selectivity | 45 dB or more |
Capture Ratio (IHF) | 3.0dB |
Image ratio | 50 dB or more |
IF Rejection | 60 dB or more |
Spurious Radiation | 34 dB or less |
Spurious response rejection | 60 dB or more |
FM stereo / separation | 35 dB or more |
Local / Ditto | Local:attenuate 20dB Distant:direct |
Antenna input | 300 Ω balance 75 Ω unbalance |
<AM Department> | |
Receiving frequency | 535 kHz to 1605 kHz |
Sensitivity (IHF) | 20 μ V ± 3 dB (1 MHz) |
Image ratio | 40 dB or More (1 MHz) |
IF Rejection | 60 dB or More (1 MHz) |
Selectivity | 20 dB or More (1 MHz) |
Output Level / Impedance | 1.5 V or More / 10k Ω or More |
<General> | |
Attachment mechanism | FET / FM front end Dial tuning FM stereo auto FM stereo indicator FM Local / Distant Switch MPX Noise Canceler Flywheel tuning FM muting Pinpoint tuning circuit AM ferrite bar antenna Output level adjuster PB Series Pair Design |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 10VA |
External dimensions | Width 292x Height 111x Depth 267 mm |
Weight | 3.9kg |
Sold Separately | Wood Case C-10 |