Sansui QA-7000

Four Channel Integrated Amplifier

In very nice condition! Original box, packing, and manual are not included.

See eBay listing for current price. Last pix is a stock pix

Circa 1973

Incorporates a QS Synthesizer circuit to reorganize conventional 2-channel stereo signals and create a 4-channel sound field.

The built-in QS regular matrix system 4-channel decoder decodes 4-channel records and tapes encoded with the QS system, and their broadcasts, to reproduce them as a perfect 4-channel sound field.

The built-in Phase Matrix circuit, featuring Sansui's own front-back logic, decodes records and tapes en­coded with the CBS SQ system to reproduce them in 4-channel stereo.

Offers 4-channel AUX inputs, to which you can connect a discrete 4-channel record demodulator to reproduce discrete 4- channel records.

The unique BTL switch bridges the four power amplifiers in the QA-7000 into two higher-power amplifiers in 2-channel stereo usage. If desired, external power amplifiers may then be added to them to create a higher­ power 4-channel amplifier system.

The preamplifier and power amplifier sections can be separated for independent usage by disconnecting the connectors.  Then, they may be employed with a different preamplifier or power amplifier, or even upgraded into a electronic crossover system.

Offers two 4-channel tape record playback circuits and one 2-channel tape record/ playback circuit, with tape-to-tape reprint (dubbing) facilities.

Signals from discrete 4- channel sources, 4-channel signals converted from 2-channel sources by the QS Synthesizer, and those decoded by the QS regular matrix system decoder or the Phase Matrix circuit, can all be recorded into a tape with simple operations of appropriate switches .

The front channel portion of each 4-channel input circuit can be utilized like a regular 2-channel input circuit.

Any 2-channel program source component, or the front-channel portion of any 4-channel component can be operated with the QA-7000 for normal 2-channel stereo sound or QS-synthesized 4-channel stereo sound.

Offers facilities for independent adjustments of tonal quality in the front and rear channels.

Specs:

Power output: 40W/ch into 8Ω (stereo), 15W/ch into 8Ω (quadraphonic)

Frequency response: 20Hz to 40kHz

Total harmonic distortion: 0.1%

Damping factor: 100

Input sensitivity: 2.5mV (MM), 100mV (line)

Signal to noise ratio: 70dB (MM), 80dB (line)

Output: 100mV (line), 30mV (DIN)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 97 x transistors, 2 x FET, 2 x zener diodes, 62 x diodes

Dimensions: 440 x 140 x 322mm

Weight: 14kg

Full specs last image

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