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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





Kenwood TK-40x

 Kenwood model TK-40x Solid State Stereo FM/AM Receiver System
Kenwood has matched an outstanding solid state receiver with two compact speakers to offer you a superbly engineered stereo sound system that adds up to unusual quality and value. The FM/AM TK-40x Receiver offers 40 watts music power, silicon transistor amplifier, F.E.T. , 3-gang tuning condense, exclusive power transistor protection circuit, and other advanced engineering features. The s-40 speaker set, with a large size (6 ½") woofer and built in tweeter, provides dynamic bass, excellent mid-range and brilliant, smooth, distortion-free treble sound.

Special Features
Tuner Section
3-gang tuning condenser front-end for superior sensitivity and image rejection.
5 IF stages with 4 limiters and wideband ratio detector to provide 45 dB alternate channel selectivity and freedom from noise and interference.
Automatic Stereo/Mono mode silent switching circuit with steeo light indicator
4 diodes time division multiplex decoder for 38 dB stereo separation.
Illuminated pinpoint tuning meter.

Amplifier Section
40watts  of IHF stsndard total music power
Very low IM distortion for exceptional clear-sound low level to high level listening
All silicon transistor amplifier for wide 20 to 50,000 Hz frequency response and 20 to 30,000 Hz power band width.
High damping factor 40 (16 ohms), 20 (8 ohms), for excellent transient response.
Exclusive blow-out free automatic circuit breaker protects power transistor.
4-position program source selector permits AM, FM, AUTO, PHONO and AUX.
Direct tape monitor switch for tape monitoring without changing cable connection.
Mode switch for Stereo and Mono sound reproduction
Volume control with rocker switch for loudness control.
Bass and treble controls may be used to regulate eachchannel simultaneously.
High filter switch eliminates for scratch noise and stereo multiplex noise.
4 pairs of input terminals for MAG, AUX, TAPE REC and TAPE PLAY.
Front panel stereo phone jack
Center channel low level output for monaural amplifier and speaker.
Handsome simulated walnut finish cabinet - included in price of unit.
Specifications
Tuner section
Usable Sensitivity
FM :  2,5 mV (IHF standard)
AM :  10 mV (IHF standard)
FM Frequency Response:  20 - 20,000 Hz ±2 dB

FM Signal-to-Noise Ratio:  60 dB
FM Harmonic Distortion:  0,6% (1 kHz, 100% mod)
FM Capture Ratio:  2,5 dB
FM Selectivity:  45 dB
FM Stereo Separation:  38 dB (at 400 Hz)
FM Image Rejection:  60 dB
FM Cross Modulation Rejection:  80 dB
FM IF Stages:  5 stages
AM/FM  Front End:  Transistorized 3 Gang (FM), 2 Gang (AM)
Amplifier Section
Total Music Power:  40 watts (IHF standard at 4 Ω)
Continous Power:  32 watts (0,5% THD)

Frequency Response:  20 Hz - 50,000 Hz
Power Bandwidth:  20 Hz - 30,000 Hz  (-3 dB)
Signal-to-Noise Ratio: 
Phono :  60 dB
Aux :  70 dB
Input Sensitivity:
Phono :  2 mV
Aux :  150 mV
Tape Play :  150 mV
Mag Maximum Input Signal:  100 mV P.P. (1 kHz)
Damping Factor:  20
High Filter:  6,000 Hz Cut-off
Bass Control:  ±10 dB at 50 Hz
Treble Control:  ±10 dB at 10,000 Hz
Volume Control Tracking Error:  within 3 dB
Center Channel Output:  yes
Speaker Impedance:  4 - 16 Ω
Power Consumption:  AC 110 - 120 Volts, 60 watts
Dimensions (W x H x D):  16 ½ " x 5" x 12"

Net Weight:  19,8 lbs

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