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





Pioneer SX-727 receiver

Upper range power output, unusual FM selectivity and sensitivity and the versatility of units costing much, much more - the SX-727 stereo receiver from Pioneer puts together all of these hi-fi virtues and offers the music enthusiast a new high in stereo valve. verSatility is the keynote of this attractively-designed unit. The SX-727 handles up to two tape decks, two turntables, three pairs of speaker system and a microphone. Its sensitive FM section is loaded with the very latest of solid state circuitry - the better to offer distortion free reception. Its direct-coupled power amplifier circuitry means a wide power bandwidth and superb frequency response. And the unit puts out up to 195 watts of music power (at 4 ), more than enough to fill a large room with great sound. Now available at a price that is as surprising as its many features.

 


Features:

Two tuning meters, a wide linear scale FM -dial

Sensitive FM front-end section

FET equipped FM Muting Circuit

IF section with ceramic filters

FET equipped control amp section

Direct-coupled power amp section

Tape-to-tape duplication

 


Specifications

Power Amplifier Section

Music power Output (IHF):

195 watts at 4

122 watts at 8

Continous Power Output (1 kHz, each channel driven)

69 W/69 W at 4

48 W/48 W at 8

Continuous Power Output (1 kHz, both channel driven):

50 W +50 W at 4

40 W + 40 W at 8

Power Output in the Range of 20 Hz to 20 kHz (both channels driven):  37 W + 37 W ( 8 , T.H.D. less than 0,5%)

Total Harmonic Distortion

Less than 0,5% (Continuous power output)

Less than 0,03% (8 , 24 W/24 W power output)

Intermodulation DIstortion

Less than 0,5% (Continuous power output)

Less than 0,03% (8 , 24 W/24 W power output)

Power Bandwidth (IHF):  10 Hz to 60 kHz (8 , T.H.D. less than 0,5%)

Frequency Response;  7 Hz to 80 kHz, ±1 dB

Input Sensitivty/Impedance:  500 mV/50 k  (1khz, Continuous power output)

Speakers:  4 to 16

Damping Factor:  40 (8 , 1 kHz)

Preamplifier Section

Output Voltage:  500 mV (Rated output, 4 V Max.)

Total Harmonic Distortion :  less than 0,1%

Frequency Response:  10 Hz to 20 kHz ±1 dB

Input Sensitivity/Impedance (1 kHz, for rated output)

Phono 1 Mag :  3 mV/50 k

Phono 2 mag :  3 mV/50 k

Mic :  2,7 mV/50 k

Aux :  200 mV/100 k

Tape Monitor 1, 2 :  200 mV/100 k

Recording Output

Tape Rec 1, 2 :  200 mV (Pin jack)

Tape Rec (DIN) :  35 mV

Controls:

Bass :  ±10 dB at 100 Hz

Treble :  ±10 dB at 10 kHz

Low Filter :  -8 dB / 50 Hz (6 dB/oct.)

High Filter :  -9 dB /10 kHz (6 dB/oct.)

Equalization Curve:  Phono RIAA standard

Loudness Contour:  +10 dB/100 Hz ; +6 dB/10 kHz (with Volume Control set at -40 dB position)

Muting:  -20 dB

Hum and Noise (IHF):

Phono :  better than 85 dB

Aux :  better than 95 dB

FM Tuner Section

Frequency Range:  88 MHz to 108 MHz

Usable Sensitivity (IHF):  1,8 µV

Capture Ratio (IHF):  2,0 dB

Selectivity (IHF):  better than 70 dB

Image Rejection:  better than 85 dB (98 MHz)

IF Rejection:  better than 100 dB (90 MHz)

Spurious Rejection:  better than 90 dB (98 MHz)

AM Suppresion:  50 dB

Signal-to-Noise Ratio :  70 dB

Total Harmonic Distortion :

Mono : less than 0,3% (100 % mod.)

Stereo :  less than 0,5% (100 % mod.)

Tuning Indication:  Signal strength type and Center tuning type

Muting:  switchable to On-Off

Stereo Separation:  better than 40 dB (1 kHz)

Subcarrier Suppression:  better than 50 dB

Antenna Input:  300  (balanced); 75  (unbalanced)

AM Tuner Section

Frequency Range:  525 kHz to 1605 kHz

Usable Sensitivity (IHF):  10 µV

Selectivity (IHF):  better than 35 dB

Image Rejection:  better than 80 dB (1,000 kHz)

IF Rejection:  better than 75 dB

Signal-to-Noise Ratio:  better than 50 dB

Antenna:  Built-in ferrite loopstick antenna

Miscellaneous

Semiconductors:  4 FETs: 4ic; 56 Transistors; 37 Diodes

Power Requirements:  110, 120, 130, 220, 240 V 50/60 Hz

Power Consumption:  270 W (max.)

AC Outlets:  Switched 1, Unswitched 2

Dimensions (W x H x D):  485 x 150 x 390 mm (19-1/16" x 5-7/8" x 15-3/8")

Weight: 

Without Package :  14 kg (30 lb 14 oz)

With Package :  17 kg (37 lb 8 oz)


 

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