These have been around at least since 2011. I can't even find Technics support page. I gather one might dig out the address for support from one of the manuals. But I can't find its manual, either, just one for the SH-8058. You might get some 3rd party support from a n appropriate forum in Tom's Hardware website. I've seen pages advertising this model used for shockingly low price or about $200. And a YouTube that may be in Spanish. So, Ill list some of all that but can only wish you good luck in chasing down a hobbyist site for this vintage setup. https://forums.tomshardware.com/threads/help-with-connecting-80s-technics-audio-components.3579784/
https://www.manualslib.com/manual/1352974/Technics-Sh-8058.html
https://reverb.com/item/41999248-technics-sh-8057-stereo-graphic-eq-programmable-spectrum-readout-14-bands-ex-sound-japan
https://picclick.com/Technics-Stereo-Graphic-Equalizer-Model-SH-8057-fully-194206894007.html
https://www.ebay.com/b/technics-sh/bn_7024744741
https://www.fixya.com/support/t11289090-technics_graphic_equalizer_sh_8057
https://www.youtube.com/watch?v=LLr4m7-3EVc
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