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Pioneer SG-9800

Stereo Graphic Equaliser (1979-81)

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Pioneer SG-9800


The Pioneer SG-9800 is a 2 channel, stereo, 12 element graphic equaliser with tape monitor.

The graphic equaliser divides the audio frequency spectrum into 12 segments from 16Hz to 32 kHz, with each segment corresponding to an octave.

Individual controls for each segment provide continuous adjustment (from -10dB to +10dB) and allow the sound to be contoured in order to compensate for equipment and speaker characteristics, listening room acoustics or personal preferences.

Adjustments can also be performed during recording.


Output Level: 1V (7.5V max)

Gain: ± 0dB

Frequency response: 5Hz to 100kHz

Signal to Noise Ratio: 92dB

Total harmonic distortion: 0.02%

Control Range: ± 10dB

Frequency Bands: 16, 32, 64, 125, 250, 500, 1K, 2K, 4K, 8K, 16K, 32KHz

Semiconductors: 27 x IC, 2 x FET, 14 x transistors, 19 x diodes

Dimensions: 420 x 150 x 355mm

Weight: 7.1kg

Year: 1980


instruction/owners manual   English -

service manual   English - danickd

service manual (additional)  English - danickd

service bulletin   English - danickd

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Reviewed Sep 16th, 2014 by Rizal

Great equalizer



re: SG-9800

I am looking to resolve a problem with the SG-9800 three On, Recording and Off equalizer push switches that act like they have dirty contacts as the signal at times will cut out. If I wiggle the switches the signal cuts in and out. As I play with it I can yet restore the signal.

When I take the unit apart, I don't see an easy or obvious solution. The sliders are for the most part covered which won't allow any type of intrusive cleaning. I can blow the contacts out with pressurized (can) air however i doubt that will make a difference. Ideally I clean it with alcohol and air however I am not that sure this is a safe or even an effective solution.

Any suggestions will be greatly appreciated.


karodimitrov's picture

re: SG-9800

Cleaning with alcohol is useful, but it evaporates..You need some type of spray lubricant. I use a similar spray when some potentiometer interrupts.Тhe most useful for me in this situations is liquid grease.Its safety and gives a good results.

SG-9800 or SG-9 Service manual

I am trying to repair a Pioneer SG-9800 equalizer with a power supply problem, and could use the service manual if anyone has one I could upload. I have also highlighted the SG-9 because I believe this is basically the same equalizer


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