Audio Database

TU-9500
Commentary

An FM/AM tuner that emphasizes practical performance and sound quality and eliminates the causes of sound quality degradation such as distortion and phase disturbance.

The FM front-end consists of two high frequency amplification stages and a mixer stage using a newly developed frequency linear FM5 series variable capacitor and three dual-gate MOS FETs.
In the IF stage, a newly developed uni-wafer-type 2-element ceramic filter with a wide bandwidth and excellent selectivity is adopted in a 4-stage configuration, and a unique circuit configuration with excellent phase linearity for correcting phase shift is adopted.

The MPX section employs a newly developed D. D. C. (differential demodulation circuit) to electronically cancel the SCA filter, thereby preventing the phase shift caused by the attenuation characteristic of the LC element used in the SCA filter.

The AM tuner section features a newly developed wide-band high-selectivity coil, a 2-element ceramic Yaman filter, a high-frequency amplifier 1-stage, and a 3-row varicon for excellent sensitivity, selectivity, and sound quality.

The power supply uses a transistor and a zener diode to eliminate ripple and voltage fluctuations.

It is equipped with a noise suppressor switch. It functions as an MPX noise canceler that removes stereo noise without cutting high frequencies above 10 kHz when receiving FM stereo broadcast transmission, and as a whistle filter that suppresses beat noise above 7 kHz when receiving AM broadcasting.

The muting control eliminates inter-station noise and sync pop noise, and also controls the amount of muting applied.

A discriminator output terminal is mounted for 4 ch discrete broadcasting.

Equipped with multi-path observation terminal.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Sensitivity (IHF) 1.7 μ V
Total harmonic distortion factor Mono : not more than 0.2%
Stereo : 0.3% or less
Signal-to-noise ratio 75 dB or more
Selectivity 80 dB or more
Capture Ratio (IHF) 1.5dB
Image Frequency Rejection 100 dB or more
IF Rejection 100 dB or more
Spurious response rejection 100 dB or more
Stereo separation 40 dB or More (400 Hz)
Unwanted radiation 34 dB or more
Frequency characteristic 30 Hz ~ 15 kHz + 0.5 -2dB
Antenna input impedance 300 Ω (Balanced Type)
75 Ω (Unbalanced Type)
<AM Tuner Section>
Sensitivity (bar antenna) 46dB/m
Selectivity 25 dB or more
Image frequency rejection 100dB/m or more (1 MHz)
IF Rejection 100dB/m or more
<General>
Output voltage 0 V ~ 1 V
Tape rec output : 0.4 V
Power consumption 20W
External dimensions Width 500x Height 140x Depth 347 mm
Weight 9.5kg