Pioneer SX-770 receiver

 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