Pioneer QX-9900


Pioneer QX-9900 Faceplate


This is one of Pioneer’s four channel offerings – the Pioneer QX-9900. The QX-9900 was manufactured in the mid 70’s and featured both Matrix and SQ decoding. It’s rated at 38 watts per channel into 8 ohms and 50 watts at 4 ohms in to four channels. This unit has the distinctive holes in the top of the case.


Pioneer QX-9900 Back Panel


It also featured:

  • AM/FM stereo
  • 38×4 into 8 ohms and 50×4 into 4 ohms
  • Two tape in/outs front and rear
  • Two aux inputs front and rear
  • Two phono inputs
  • Loudness on/off front and rear selectors
  • Filters high and low on/off
  • Muting -20db on/off
  • Speakers front + Rear A & B on/off
  • MPX noise filter on/off
  • Headphone outputs front and rear
  • FM muting on/off
  • Modes – 2ch stereo, matrix regular, SQ, discrete
  • Selectors – AM, FM mono, FM auto, phono one + two, aux one + two
  • Meter levels -10db on/off -20db on/off
  • Balance front right/left, rear right/left and front to rear
  • Reverberation – time/min/max and modes for front – rear – mode off – mic
  • Left + right mic inputs
  • Left + right mic mixing control knobs
  • Separate treble and bass controls front/rear
  • Tuning and signal meters
  • 4 power meters for each channel


Pioneer QX-9900 Inside


While the Pioneer QX-9900 is fairly rare it’s not a hotly desired receiver. Still, in very good working condition they can sell for up to $400.

Awesome PIONEER QX-9900 Quadraphonic / Vintage Stereo Receiver - Pro Serviced!

End Date: Wednesday Feb-19-2020 19:04:54 PST
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Pioneer QX-9900 Receiver, 2 Pioneer CS-05 Floor Speakers, 2 Pioneer CS-X100 spkr

End Date: Sunday Mar-8-2020 18:57:32 PDT
Buy It Now for only: $650.00
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Pioneer QX-9900 Quad Receiver Amp Boards+ SInks + Outputs

End Date: Tuesday Feb-25-2020 4:39:05 PST
Buy It Now for only: $75.00
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$13.50 (4 Bids)
End Date: Monday Feb-24-2020 18:56:00 PST
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