Vintage Pioneer QX-646 Quad Chanel AM/FM Stereo Receiver. 1974, Fully

Our Restoration Procedures: 1. Check Out The Stereo, If There Is Anything Wrong, We Will Fix It. 2. Clean & Lubricate All Of The Switches & Controls. 3. Electrolytic Capacitor Check, If There Is Any Weak One, We Will Change It. 4. FM IF & MPX Circuit Alignment By Using A Sweep Signal Generator & Victor Scope. 5. Change Burned Lamps. 6. Check Out & Adjust Power Amplifier's Center Voltage & Standby Current. 7. Audio Frequency Response & Distortion Test. 8. Clean All Of The Knobs By Ultrasonic Cleaner. 9. Functional Check. 0. All Sales We Give A 90-Day Labor & Parts Warranty, If There Is Any Problem, You Send It Back We Will Repair It For You Free Of Charge, You Pay The Send-In Postage, We Pay The Send-Back Postage.
Description
The QX-646 is equipped with all present quadrophonic systems, CD-4, SQ and regular matrix.
It features extra wide linear FM dial scale and an extra large signal strength meter for easy, precise tuning.
Other features include program source illumination, headphone terminal and 3 pairs of speaker terminals.
Specifications
Tuning range: FM, MW
Power output: 11W/ch (stereo), 10W/ch into 8Ω (quadraphonic)
Frequency response: 10Hz to 100kHz
Total harmonic distortion: 1%
Damping factor: 40
Input sensitivity: 2.5mV (MM), 180mV (DIN), 180mV (line)
Signal to noise ratio: 70dB (MM), 90dB (DIN), 90dB (line)
Output: 180mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 9 x FET, 5 x IC, 109 x transistors, 45 x diodes
Dimensions: 525 x 149 x 360mm