Audio Database

TU-5500
Commentary

FM/AM tuner with improved characteristics by adopting high-reliability exclusive IC for main circuit.

In the FM front-end, a dual-gate MOS type FET with less noise and distortion is used for the RF stage, and high sensitivity is obtained by combining it with a frequency linear type 3-row variable capacitor.
In addition, cross-modulation characteristics for high-level signals, such as in high-field regions, have been greatly improved by installing an antenna attenuator switch.

The FM IF stage is composed of two stages (four elements) of high-performance ceramic filters with excellent selectivity and wide bandwidth to improve selectivity and phase characteristics.
In addition, a dedicated monolithic IC is used for the limiter stage to eliminate unnecessary amplitude modulation components, resulting in high SN characteristics.

A highly integrated IC is used in the FM multiplex section to reproduce the composite signal from the detection stage with excellent separation.

The AM tuner section consists of a high-integration IC, a metal type, and a ceramic filter, and is designed with little distortion.

The dial face is treated with a special aluminum etching process that is corroded to leave the letters on the scale face, making it resistant to changes over time. In addition, a miniature light-emitting diode is used for the dial indicator.

Uses a back tension spring system for smooth tuning.
Constant tension is given to the dial thread to enable accurate tuning.

Equipped with a signal meter that shows the strength of radio waves and a center tuning meter that shows the accurate tuning point.

The power supply section supplies all circuits with a stabilized power supply by a constant voltage power supply circuit.
As a result, stable operation of each block stage is obtained.

The signal meter uses a linear meter method to indicate accurately in proportion to the input level.

FM noise can be cut by the noise canceler switch.

The FM antenna terminal is equipped for 300 Ω / 75 Ω coaxial.

Equipped with two output terminals.

The output level can be adjusted.

Equipped with a discriminator detection type FM muting, it detects the deviation from the tuning frequency and is a muting method in which no sound is produced until the distortion rate becomes less than a certain value.

Equipped with large grounding terminal and spare AC outlet.

It was equipped with a discriminator output terminal and was compatible with FM4ch broadcasting.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Sensitivity (IHF) 1.9 μ V
Total harmonic distortion factor Mono : 0.3% or less
Stereo : not more than 0.4%
Signal-to-noise ratio 70 dB or more
Selectivity 60 dB or more
Capture Ratio (IHF) 2.0dB
Image Frequency Rejection 55 dB or More (83 MHz)
IF Rejection 80 dB or More (83 MHz)
Spurious response rejection 70 dB or More (83 MHz)
Stereo separation 40 dB or More (1 kHz)
Frequency characteristic 20 Hz to 15 kHz
Antenna input impedance 300 Ω (Balanced Type)
75 Ω (Unbalanced Type)
<AM Tuner Section>
Sensitivity (bar antenna) 50dB/m(1MHz)
Selectivity 30 dB or More (1 MHz ± 10 kHz)
Image frequency rejection 80 dB or More (1 MHz)
IF Rejection 80 dB or More (1 MHz)
<General>
Output voltage 0 V ~ 0.775 V (FM100% MOD. Variable)
Recording output voltage 0.4V
Rated power consumption 9W
External dimensions Width 434x Height 130x Depth 243 mm
Weight 6.9kg