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Realistic 31-1987 Equalizer



Compact build graphic equalizer with excellent performance made in Korea for RadioShack Tandy USA in 1987.


Front ^


Special futures:

Tape monitor function. 5 way stereo equalizer.



User Manual:

Click here to download the user manual PDF format


Manual ^




Click here to download the schematic diagram in jpg format

Excellent schematic diagram: very good electronic design, diff-amp & class A output stage.


Schematic ^


Back ^



Set the transformer to 240V in Europe. Replace the 2 power supply capacitors with 1000 µF 63V.


Interior ^



Excellent after modification.


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© PE1MMK Hans Hilberink last update: 15-09-2020.