Luxurious new Look - Superb Performance All Silicon Transistorized AM/FM Multiplex
Ideal for home listening. The SX-770 has power to space, very clean sound, smart and versatility in operation. Inside, the circuitry of the new SX-770 has an array of features to ensure truly satisfying high fidelity. There are a top-quality monolithic integrated circuit in the FM multiplex section, silicon transistors in the AM section, a quasi-complementary single ended push-pull circuit for superb damping throughout the entire range and many more refinements usually found only in much more expensive units. The versatility, the advanced circuitry, the large power and the refined design make the SX-770 the perfect choice for the center of your home stereo system.
Features:
Low-Noise FET in FM Section
Coupled with the use of a low-noise FET, the FM section is designed for a high sensitivity to obtain a sufficient Signal-to-Noise Ratio
Excellent Selectivity
The IF amplifier stage uses a combination of a low-noise silicon transistor and a monolithic IC to attain an excellent selectivity characteristic.
Monolithic IC for MPX section
The MPX section is an IC for a stable, wide frequency band and a sharp channel separation. A sufficient measure is taken against SCA beat.
Highly Sensitive AM tuner
Due to the silicon transistor and ferrite antenna, the AM tuner has a high and stable sensitivity.
Microphone terminal for a versatility of use
Input terminals include a magnetic-cartridge record player terminal and a microphone terminal. Output terminals include a center channel terminal and a preamplifier terminal. Thus model SX-770 can be used in various ways
Well Damped, Clear Sound
The output stage is a quasi-complementary SEPP circuit using silicon transistors. Model SX-770 reproduces well-damped, clear stereo sound over a wide frequency range from bass to treble
Variety of accessory circuits
Accessory circuits include an FM AFC circuit, muting circuit, high-cut filter, tape monitor, loudness contour switch, etc.
Novel Appearance
In addition to the black panel, the numeral indication is embossed on the dial plate according to the selected position. Also, the dial pointer glows.
Specifications
Audio Section
Semiconductors: 21 transistors; 7 diodes
Circuitry: Single ended Push Pull
Music Power Output:
70 watts total at 4 Ω (IHF rating)
52 watts total at 8 Ω (IHF rating)
RMS Rated Power Output (both channel driven)
17 + 17 watts at 4 Ω
15 + 15 watts at 8 Ω
RMS Rated Power Output (each channel driven)
20 watts / 20 watts at 8 Ω
Harmonic Distortion: less than 0,8% (at 1 kHz rated output)
Frequency Response: from 20 Hz to 40 kHz ±3 dB (Over-all)
Power Bandwidth: 15 Hz to 35 kHz (AUX)
Damping Factor: 35 at 8 Ω (1 kHz)
Hum and Noise (at rated output):
Mag.: better than 80 dB
AUX : better than 95 dB
Input Impedance and Sensitivity (for rated output):
Phono Magnetic : 2,5 mV/50 k Ω (1 kHz)
Phono Ceramic : 58 mV/100 k Ω
Microphone : 5 mV/100 k Ω (1 kHz)
Tape Monitor : 200 mV/100 k Ω (1 kHz)
Aux : 200 mV/100 k Ω (1 kHz)
Output Terminals and Jacks:
Speakers : 4 to 16 Ω Impedance
Headphones Stereo Jack
Simultaneous tape recording jacks, equipped with Tape Monitor switch
Tape recording/Playback Jack (DIN type)
Equalization Curves: Phono RIAA
Tone Controls (each Channel):
Bass ; boost 13 dB, cut 14 dB at 50 Hz
Treble : boost 10 dB; cut 9 dB at 10 kHz
Filters: High - cut 9 dB at 10 kHz
Loudness Contour (On/Off) with Volume control set at -40 dB:
Boost 12 dB at 50 Hz,
Boost 7,5 dB at 10 kHz
FM Section
Semiconductors: 9 Transistors; 12 Diodes; 1 FET; 3 Ics
Circuitry: Front end using FET
Frequency Range: 87,5 - 108 MHz
IHF Usable Sensitivity" 1,8 µV
Image Rejection: 60 dB (at 98 MHz)
Signal-to-Noise Ratio: 70 dB (IHF rating)
Antenna Input: 300 Ω (balanced)
Multiplex Section
Circuitry: Time-switching type demodulator FM Mono Stereo Automatic selection
Channel Separation: 40 dB (at 1 kHz)
AM Section
Circuitry: Superheterodyne
Frequency Range: 525 - 1605 kHz
IHF Usable Sensitivity 10 µV
Image Rejection: 55 dB (at 1000 kHz)
Antenna Input: Built-in Ferrite Loopstick Antenna
Miscellaneous
Power Requirements: 110, 117, 130, 220, 240 Volts(switchable) 50/60 Hz
Power Consumption: 117 VA 108 watts (max)
Dimensions (W x H x D): 430 x 145 x 349 mm (16-15/16" x 5-11/16" x 13-3/4")
Weight: 9,6 kg (21 lbs 2 oz) net
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