Audio Database

TX-100 Image
Commentary

An AM/FM stereo tuner that emphasizes all qualities such as reception accuracy, function and sound quality.

The FM front-end uses a 4-row frequency number line type varicon, and performs two stages of high-frequency amplification.
A MOS FET is used for the first stage, a JFET is used for the second stage, and a mixer circuit using a MOS FET and a stable Colpitts-type local oscillator circuit are added.
This realizes excellent interference rejection characteristics.

The FM IF section employs a 5-stage amplifier circuit using four ICs and two crystal filters.

The AM tuner section uses a 3-row varicon and high-frequency amplification single-stage circuit. It also uses an AGC circuit for stability against large inputs.
The ferrite bar antenna antenna is unique and can be freely reoriented.

Wide dial scale is adopted, and FM scale is linear type with equal spacing.
In addition, by adopting a tuning mechanism using 2-meter and large flywheel, more accurate tuning point can be caught.

You can control the AM and FM output levels separately.

Equipped with a multi-path terminal for selecting the best antenna direction, it can be connected to a stereo display (SD-100) or an oscilloscope (sold separately) and determine the best antenna direction while viewing the antenna waveform.

It is equipped with a muting switch that cuts out inter-station noise generated during FM tuning.
In addition, you can control the muting level.

It has a built-in amplifier for headphones, so you can enjoy it with headphones without an amplifier.

Equipped with a Tape Rec connector, you can record by directly connecting a tape deck.

Attached circuit such as MPX noise filter is mounted.

Model Rating
Type AM/FM stereo tuner
FM Tuner Section
Practical sensitivity 1.7 μ V (IHF)
Capture ratio 1.5dB(IHF)
Effective selectivity 70 dB or more (IHF)
Image interference ratio 100 dB or More (82 MHz)
IF interference ratio 100 dB or More (78 MHz)
Spurious response 110 dB or More (82 MHz)
AM suppression ratio 55 dB or more
S/N 70 dB or more
Harmonic distortion factor (100% modulation) Mono : 0.3% or less
Stereo : not more than 0.5%
Tuning indicator 2-meter method (signal, tuning)
Muting ON-OFF enabled
Stereo separation 40 dB or More (1 kHz)
Residual carrier level 50 dB or more
Antenna 300 Ω Balanced Type
75 Ω Unbalanced Type
Accessory circuit Multi-path terminal
MPX Noise Filter (ON-OFF)
<AM Tuner Section>
Practical sensitivity 8 μ V (IHF)
Image interference ratio 80 dB or More (1 MHz)
IF interference ratio 75 dB or more
S/N 55 dB or more (at 30% modulation, 74 dB input)
Antenna Ferrite bar antenna
Tuning indicator Meter indication
<General>
Output voltage (100% modulation) FM : Maximum 2.4 v ~ Minimum 80 mv
AM : Maximum 1.8 v ~ Minimum 60 mv
Recorded output 750 mv (terminal open, 1 khz, FM100% modulation)
600 mv (open terminal, 1 khz, AM100% modulation)
Headphone out 30mV/8 Ω (1 khz, FM100% modulation)
Accessory circuit Output level control (FM, AM, headphones)
Power consumption Rating : 27W
External dimensions Width 430x Height 145x Depth 345 mm
Weight 8.5kg