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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





Toshiba SA-504 4-ch receiver

4-channel FM/AM/FM Stereo receiver, features:

BTL circuit (53 W x 2,8 rms, 8 Ω , 0,8%)

ITL-OTL-OCL pure complementary symmetry circuit

MOS FETs FM front end

4-gang linear frequency FM tuning condenser and tuned RF AM section

Built-in condenser cartridge equalizing circuit

Built-in QM and SQ 4-channel matrix decoder

CD-4 4-channel adaptor terminals

Black dial

Natural Walnut cabinet

 


Specifications

FM Tuner Section

Tuning Range :  88 - 108 MHz

Sensitivity: 1,8 µV (IHF)[1,8 µV, S/N=30 dB]

Signal-to-Noise Ratio:  66 dB

Capture Ratio:  1,5 dB

Image Rejection:  60 dB

IF Rejection:  80 dB

Spurious Rejection:  100 dB

AM Suppression:  50 dB (IHF)

Frequency Response:  20 - 15,000 Hz ±1 dB

Harmonic Distortion:

Mono :  0,2% at 400 Hz (100% modulation)

Stereo :  0,5% at 400 Hz (100% modulation)

FM Stereo Separation:  35 dB at 1,000 Hz

19 kHz, 38 kHz Suppression:  50 db

AM Tuner Section

Tuning Range:  530 - 1605 kHz

Sensitivity :  15 µV (IHF)

Signal-to-Noise Ratio:  45 dB

Selectivity :  30 dB (±10 kHz)

Overload :  2 V/m at 1,000 Hz

IF Rejection:  70 dB

Harmonic Distortion :  1 %

Audio Section

Power Output:  30 W x 4 (rms 0,4%, 8 Ω , each channel driven) or 53 W x 2 (at BTL connection, rms 0,4%, 8 Ω , each channel driven)

Frequency Response:  20 - 40,000 Hz 12 dB

Power bandwidth:  10 - 80,000 Hz (IHF, 0,4%)

Signal-to-Noise Ratio

Phono :  65 dB

Aux :  80 dB

Input Sensitivity/Impedance (for rated output):

Phono :  2,5 mV/47 K Ω

CC :  30 mV/70 k Ω

Aux :  160 mV/47 K Ω

Tape :  160 mV/47 K Ω 

Damping Factor:  20 at 8 Ω

Tone Control:  ±10 dB at 100 Hz and/or 10 kHz

High Cut Filter:  6 dB /oct, fc = 9000 Hz

Low Cut Filter:  6 dB/oct, fc = 30 hz

Residual Noise:  1,5 mV or less

Loudness Control:  +10 dB (ay 100 Hz); +4 dB (at 10 kHz)

Total Control

Volume :  4-gang, co-axial

Tone Control : Bass and treble for each Front and Rear channel :  4-gang, co-axial

Balance :  4 (discrete)

Selector :  AM/FM auto/Phono/Aux 1 (4-ch)/ Aux 2 (4-ch)

Mode :  Mono/Stereo/4-ch 1 (QM)/4-ch 2 (SQ)/4-ch 3 (discrete)

Power/ Speaker Switch :  PWR Off/A (4-ch)/SP Off ]/B (2-ch)/A+B

Accessory Switch :  CC/Mag; Tape monitor, FM muting, Loudness, AFC, audio mute; Hi/Lo cut

Antenna

FM :  300/75 Ω  terminals

AM :  Ferrite core antenna, external antenna terminals

Connector :  Aux (4-ch), Phono (Mag/CC), Rec /P.B. (4-ch), 2-AC outlet, Headphone (frontand rear) pre-out/main-in

Accessory Circuit:  Circuit breaker for final stage FM muting, audio muting, signal strength meter, center-zero meter

Semiconductors:  5 ICs; 3 FET, 38 Transistors; 24 Diodes

Power Requirements:  AC 100/120/220/240 V, 50/60 Hz

Cabinet:  Natural walnut

Dimensions (W x H x D):  508 x 125 x 356 mm (20" x 4-7/8" x 14")

Weight:  15 kg (33 lbs)


 

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