FM/AM Stereo
Receiver
You enjoy
greater stereo power and superior stereo performance at much less cost with
Sansui's newest medium-priced FM/AM stereo receiver, the 771. thanks to its
refined CBM (Circuit Board Module) construction, the 771 outperforms many
higher-priced receivers in the field. Here's how.
Thanks to
CBM, which simplifies construction, reduces costs and increasas electronic
capabilities, the moderately-priced 771 is able to offer a very superior power
amplifier - an all-stage direct-coupled OCL powerhouse delivering a continuous
RMS 40W/40W (total music power of 140 watts) to drive up to two stereo pairs of
speakers at a time with less than 0,5% THD and a urprisingly wide power
bandwidth of 15 to 40,000 Hz. Its FM/AM tuner features an MOS FET equipped FM
section with sensitivity of 2,0 µV (IHF) to pull in the fuzziest of stereo
signals with surprising clarity. And its preamplifier and control sections are
equally outstanding providing inputs and controls for two stereo tape decks,
two Aux, a microphone circuit, a superior 2-stage direct-coupled phono
equalizer, distortion-free tone controls with FETs, audio muting, low/high
filters and loudness, and a unique stereo/mono switch which bypasses the FM
multiplex circuit when it is turned to mono position.
Exclusive
Sansui CBM design improves performance while reducing costs.
Sansui
developed the unoque CBM technique specifically for its finest 2- and 4-channel
studio and consumer products. This new design concept increases electronic
capability and dependability, reduces wiring and size, and greatly lowers the
expense of construction and chassis assembly. The 771 incorporates four such
CBM units, one each for its tuner, preamplifier, power amplifier and power
supply sections. Ordinary receivers with considerably higher price tags require
up to a dozen complicated and potentially troublesome circuit boards to produce
the same results.
Sensitive FM
tuner with integrated circuits and MOS FETs
The RF
amplifier in the 771's newly-designed FM frontend uses a dual-gated low-noise
MOS FET and a 4-gang tuning capacitor to pull in distant or weak signals with
high resolution while rejecting undesired interference from stronger adjacent
stations. The F amplifier and FM mixer stages are coupled through a double
tuning circuit to achieve excellent selectivity, intermodulation and image
characteristics. Outstanding FM sensitivity is 2,0 µV (IHF). The FM IF section
incorporates three bi-resonator ceramic filters, a sharply-limiting 2-stage
2-IC differential amplifier and a phase-compensation circuit for greater phase
linearity. The sum effect of these devices is reflected in the receiver's
excellent FM capture. AM suppression and S/N ratios and its low THD
performance.
Newly-developed
IC-equipped FM Multiplex demodulator.
The 771's
new FM multiplex demodulator features a high-density IC for improved stability.
Stereo separation is better than 35 dB and THD in stereo FM reception is less
than 0,6%. An FM de-emphasis switch inside the chassis allows the 771 to be
easily converted for ideal reception of FM signals anywhere in the world.
Wide-Range,
whine-free AM tuner.
Like the FM
section, the circuitry of the 771's superior Am tuner is designed for the
sharp, clean reception and reproduction of both local and distant signals. It
features a 2-gang tuning capacitor, and a bi-resonator Jaumann type ceramic
filter to eliminate AM whine and other annoying noise. The built-in AM ferrite
bar antenna is space wound and highly sensitive.
Dependable,
independent amplification power.
An all-stage
direct-coupled OCL semi-complementary power amplifier is employed in the 771 to
provide dependable and extemely clean stereo power to drive even the largest of
stereo speaker systems with ease. Thanks to a differential amplifier in its
initial stage and its dual plus/minus power supply, independent from the supply
stages in other parts of the receiver, you have at your command a full 40 watts
of continuous RMS power per channel (into 8 ohms at 1 kHz, both channels
driven). Its power bandwidth is especially wide - from 15 to 40,000 Hz - while THD and IM Distortion figures are both
held to a low, 0,5% or below at any power level up to the rated power output.
This means that you can enjoy clear-cut high-fidelity reproduction of a broad
audio spectrum from the rich and mellow bass tones to tingling and transparent
highs.
Other
Features:
Easy-to-read
linear tuning scale and smooth-tune mechanism.
Direct-coupled
low-noise phon equalizer.
Microphone
circuit for extra convenience.
NF type tone
control amplifier with FETs.
Two tape
record/playback circuits and two stereo Auxiliary inputs.
Power
protection a plenty.
Attractive
champaigne-gold front panel with user-oriented control display.
All-wood
cabinet with cushioned no-mar feet.
Specifications
Audio
Section
Power Output
(at rated distortion)
Music
Power (IHF) : 140 W (4Ω, 1kHz); 110 W (8Ω, 1kHz)
Continuous
Power
Each
Channel Driven : 55/55 W (4Ω,
1kHz); 45/45 W (8Ω, 1kHz)
Both
Channels Driven : 40 + 40 W (8Ω,
1kHz); 32 + 32 W (8Ω, 20-20,000Hz)
Total
Harmonic Distortion (at rated power output):
Overall
(fromAUX) : less than 0,5%
Intermodulation
Distortion (at rated power output, 70Hz : 7,000Hz = 4 : 1 SMPTE method)
Overall
(from AUX) : less than 0,5%
Power
Bandwidth (IHF): 15 to 40,000 Hz
Frequency
Response (at 1 Watt power output)
Overall
(from AUX) : 15 to 30,000 Hz, +1 -2 dB
Equalization
(at tape Rec output): RIAA Curve (30 to
15,000 Hz ±1 dB)
Load
Impedance: 4 to 16 Ω
Damping
Factor: 60 (8Ω)
Channel
Separation (1kHz at rated power output)
Phono :
better than 45 dB
Aux 1, 2 :
better than 45 dB
Hum and
Noise (IHF)
Phono :
better than 70 dB
Aux 1, 2 :
better than 80 dB
Input
Sensitivity and Impedance (1kHz for rated poer output)
Phono
: 2,5 mV/ 50 kΩ (Max. Input
capability 200 mV at rated distortion)
Mic
(monophonic) : 2,5 mV/50 k Ω
Aux 1,
2 : 100mV/50 kΩ
Tape-1
Play
Pin Jacks : 100 mV/50 kΩ
Rec/Play
DIN Socket : 100 mV/50 kΩ
Tape-2 (4-ch
adaptor)
Play
Pin jacks : 100 mV/50 kΩ
Recording
Output
Tape-1
Rec Pin
Jacks : 100 mV
Rec/Play DIN
Socket : 30 mV
Tape-2 (4-ch
adaptor)
Rec Pin
Jacks : 100 mV
Switches and
Controls
Bass : +12
dB, -12 dB at 50 Hz
Treble : +12
dB, -12 dB at 10,000 Hz
Loudness :
+10 dB at 50 Hz; +8 dB at 10,000 Hz
High Filter
: -10 dB at 10,000 Hz (6 dB/oct)
Low Filter
: -10 dB at 50 Hz (6 dB/oct)
Tuner
Section
FM Mode
Tuning
Range: 88 to 108 MHz
Sensitivity
(IHF): 2,0µV
Total
Harmonic Distortion
Mono : 0,4%
Stereo :
0,6%
Signal-to-Noise
Ratio: better than 60 dB
Selectivity: better than 60 dB
Capture
Ratio: 2,0 dB
Image
Rejection: better than 70 dB at 98 MHz
IF
Rejection: better than 90 dB at 98 MHz
Supurous
Response Rejection: better than 80 dB at
98 MHz
Spurious
Radiation: les than 34 dB
Stereo
Separation: better than 35 dB at 400 Hz
Frequency
Response: 30 to 12,000 Hz; +1 -3 dN
Antenna
Input Impedance: 300Ω balanced (75Ω unbalanced)
AM Mode
Tuning
Range: 535 to 1,605 kHz
Sensitivity
(Bar Antenna): 50 dB/m at 1kHz
Selectivity: better than 28 dB at 1MHz
Image
Frequency Rejection: better than 80 dB/m
at 1Mhz
IF
rejection: better than 80 dB/m at 1MHz
Others
Semiconductors: 49 Transistors; 25 Diodes;
3 FETs; 3 ICs; 4 Zener Diodes
Power
Requirements
Voltage :
100,117, 220, 240 V 50/60 Hz
Consumption
: 100 W (rated), 310 VA (max.)
Dimensions
(W x H x D): 480 x 135 x 300 mm
(18-7/8" x 5-3/8" x 11-13/16")
Weight: 12 kg (26,4 lbs ) Net; 14,6 kg (32,7 lbs) Packed
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