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

Sansui AU-7500 (1972)

Solid State Integrated Amplifier

This professional stereo component, an integrated amplifier with unusually wide power bandwidth, says a lot about the way Japan's foremost audio only specialist meets the demanding requirements of the stereo world today. A perfect power match for the TU-7500 stereo tuner, the AU-7500 represents a significant milestone in Sansui's pursuit of excelence. Not only are these two products the most advanced of any 2-channel products ever made by Sansui, they also represent the pinnacle of the company's up-to-the-minute knowledge of audio acoustics and electronics.

The AU-7500 boasts such performance characteristics as total harmonic distortion and intermodulation distortion which has been limited to below 0,1% throughout the audio spectrum and well beyond. With its super-wide power bandwidth of 5 - 40,000 Hz, you can achieve RMS power of 43 watts into 8 ohms, along with total harmonic distortion of only 0,1%. Inside the AU-7500 are a PNP-NPN-PNP heterojunction three stage direct coupled equalizer amplifier with an input capacity of no less than 300 mV RMS resulting in such a wide dynamic range. There are also low noise PNP transistor tone control circuits and a direct coupled DCL pure complementary power amplifier employing two 6,800 μF jumbo power supply capacitors. Finally this professional amplifier is blessed with a variety of convenience features, including a 4-channel adaptor switch, the ability to connect up to three tape decks, and provisions for tape-to-tape dubbing. And in terms of tonal quality, the AU-7500 quite simply has no equal.



System: Transistor

Colour: Black, Silver frame

Power Output

IHF Music Power: 150 W (4 Ω, 1 kHz)

Continuous RMS Power: 43/43W (4 Ω, 1 kHz) each channel driven

Continuous RMS Power: 40 + 40 W (8 Ω,1 kHz) both channel driven

Continuous RMS Power: 32 +32 W at 8 Ω (both channel driven at rated distortion, 20 to 20,000 Hz)

Total Harmonic Distortion: less than 0,1% at rated power

Intermodulation Distortion: less than 0,1% at rated output (70 Hz:7,000Hz=4:1 SMPTE method)

IHF Power Bandwidth: 5 to 40,000 Hz (each channel driven at 8 Ω)

Frequency Response (at 1 watt power output):

Phono 1, 2: ±0,5 dB (30 - 15,000 Hz) RIAA

Over-all (from Aux): 10 - 30,000 Hz; ±1 dB

Main Input: 10 - 50,000 Hz; ±1 dB

load Impedance: 4 to 16 Ω

Damping Factor: approx 40 at 8 Ω load

Pre Amplifier

Inputs: Phono MM I, Phono MM II, Mic, Tuner, Tape, Monitor

Input Sensitivity/Impedance at 1 kHz:

Phono 1: 2,5 mV/50 kΩ

Phono 2: 2,5 mV/30, 50, 100 kΩ

Max. Input Capability: 300 mV (THD, less than 0,5%)

Microphone: 2,5 mV/50 kΩ

Tuner, Aux: 100 mV/50 kΩ

Tape 1, 2: 100 mV/50 kΩ (Pin, DIN)

4-ch Adapter: 100 mV/50 kΩ

Main Input: 800 mV/40 kΩ

Output Voltage at 1 kHz:

Phono 1, 2: better than 50 dB

Mic, Tuner, Aux: better than 50 dB

Main Input: better than 65 dB

IHF Hun and Noise:

Phono 1, 2: better than 75 dB

Microphone: better than 75 dB

Tuner, Aux: better than 80 dB

Main input: better than 100 dB

Tone Controls:

Bass : ±15 dB at 50 Hz,

Midrange: ±5 dB at 1,500 Hz

Treble: ±15 dB at 15 kHz

Loudness: +10 dB at 50 Hz; +10 dB at 15 kHz (volume control at -30 dB)

Low Filter: -12 dB at 50 Hz (12 dB/oct)

High Filter: -11 dB at 10 kHz (12 dB/oct)

Power Amplifier

Speaker Outputs: 1 x 2 Speakers, Phones

Continuous power 8Ω: 2 x 40 Watts

Dynamic Power 4Ω: 2 x 75 Watts

Frequency Response: 5 - 40,000 Hz

Harmonic Distortion: 0.1 % at rated output

Semiconductors: 38 transistors; 15 diodes; 1 zener diode

Power Requirements: 100 -250 V, 50/60 Hz

Power Consumption: 315 VA (maximum); 100 W (rated)


Dimensions (W x H x D): 440 x 140 x 322 mm (17-3/8 x 5-9/16 x 12-11/16 inch)

Weight: 12.7 Kg (28 lbs)

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