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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Denon TU-750 tuner

FM/AM Stereo Tuner

 

Fully Electronic Digital Synthesizer Ensures Best Tuning

The digital synthesizer enables optimum tuning in accordance with the frequency of different FM/AM (LW) stations in increments of 50 kHz for FM reception and 9 kHz for AM reception.

This system servo-controls the veractor diode by comparing the frequency received with an accurate reference frequency obtained by a crystal oscillator, and thereby cuts frequency drift and ensures stable reception.

 

Automatic Accurate Tuning

Set the Scanning key to Auto and push the Up (for Down) tuning key, and the higher (or lower) frequency radio wave is automatically searched for the correct tuning point. Depressing the tuning key again causes the adjacent station to be pinpointed.

 

One-Touch Precise Tuning to Any of 14 Stations

Once the desired station is selected, it can be stored in memory merely by pushing the Memory key and the associated Preset key (1-7). Thus, up to 14 stations (FM/AM) can be stored in memory. Depressing the desired Preset key pinpoints the station selected.

 

Sophisticated Circuit Configuration

At the front end, a 4-stage varactor diode comparable to a 4-gang variable capacitor and an MOS FET are used to form a solid input circuit, attaining high sensitivity and outstanding Signal-to-Noise Ratio. At the same time, image interference is appreciably removed. The intermediate frequency amplifier stage, which largely determines the total sound quality, employs a linear-phase ceramic filter featuring both low distortion and high selectivity, thereby improving the overall distortion throughout the band.

The detector circuit employs a quadrature detector IC having linear detection capability in a wide band. Also, the MPX circuit for FM detector uses a newly developed PLL-MPX IC boasting low distortion and high Signal-to-Noise Ratio, providing excellent stereo separation.

 

DC Configuration Amplifier for Audio Circuit up to Output Stage.

To transmit high-quality, distortion-free musical signals, a DC configuration amplifier eliminating the coupling capacitor is used to obtain optimum frequency characteristics.

 


Specifications

FM Section

Tuning Frequency Range:  87,5 - 108 MHz

Usable Sensitivity:  1,8 µV (10,2 dBf, 300 Ω )

Effective Selectivity:  80 dB (±400 kHz)

Signal-to-Noise Ratio (50 dB Sensitivity)

Stereo :  31,6 µV (35,2 dBf)

Mono :  3,0 µV (14,2 dBf)

Total Harmonic Distortion

Stereo :  0,08% (90% mod.)

Mono :  0,06% (100% mod.)

Capture Ratio: 1,0 dB

AM Suppression:  60 dB

Image Rejection:  50 dB

IF Rejection:  65 dB

Frequency Response:  20 Hz - 15 kHz +0,2 dB -1,5 dB

Stereo Separation:  55 dB (1 kHz)

AM Section

Tuning Frequency Range:  530 - 1620 kHz (USA); 622 - 1611 kHz (EU)

Usable Sensitivity:  18 µV

Total Harmonic Distortion:  0,6%

Signal-to-Noise Ratio:  50 dB

LW Section
tuning Frequency Range:  140 - 353 kHz

Usable Sensitivity:  40 µV

Effective Selectivity:  50 dB

Signal-to-Noise Ratio:  50 dB

General

Power Requirements:  AC 120V 60 Hz, or AC 220/240V 50/60 Hz

Power Consumption:  6 W

Dimensions (W x H x D):  434 x 66 x 300 mm

Weight:  3,1 kg

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