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Pioneer SX-9000

Stereo AM/FM Receiver (1970-72)

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Pioneer SX-9000

Specifications

Tuning range: FM, MW

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 35kHz

Total harmonic distortion: 0.5%

Damping factor: 30

Input sensitivity: 1.6mV (mic), 2.5mV (MM), 160mV (DIN), 160mV (line)

Signal to noise ratio: 80dB (MM), 100dB (line)

Output: 0.5V (Pre out)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 5 x IC, 1 x FET, 53 x transistors, 22 x diodes

Dimensions: 522 x 194 x 344mm

Weight: 15.7kg

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Comments

re: SX-9000

I have five of these units. Very underrated and extemely flexible. I would call this "Mid-Fi" at first blush with the capacitor coupled circuits, but I have heard music more detailed on some albums (White Album) than I have on more "Hi-FI" equipment. (And I have most of the high end Sansui, Pioneer and Kenwood from the 70's along with newer gear). If you get a chance to pick one of these units up - do so. Very inexpensive and almost all circuits are repairable by the hobbyist.

re: SX-9000

I picked on up that had both fuses blown I assumed the power transisters were bad however when I removed and bech tested I could find nothing unusual but I replaced and Unit came on for a few seconds then b lew one fuse and short time later the other,,I have the schematic 2yrs college electronics 2 yrs building plating rectifiers for steel mills ,I have some knowlegde what I would like is a way to identify the exact problem with my sx 9000 i love the old units plenty of raw power currently using sansui 5000 till the pioneer is ready ... send me in direction to look ,Im all ears

re: SX-9000

The problem is likely in the bias circuit if all the output and driver transistors are good. Those Nichicon 50 or 100 ohm trimmer potentiometers that Pioneer used in this era are very trouble prone. They have a tendency to open or be intermittently open.

This website is not affiliated with or sponsored by Pioneer. To purchase SX-9000 spares or accessories, please contact the company via their website or visit an authorised retailer.