https://pinelectronics.com/?%2Farchives%2F4-Synthi-Users-Manual_html
Pin Electronics, Portabella, EMS Synthi, VCS3 Analogue Synthesiser Made in Germany Synthi
Pin Portabella, Pin Electronics, Ghielmetti, matrixsynth, Ring Modulator, Blog about ,EMS Synthi A, Delaware, VCS3, Synthi 100, Synthi 50, The Synthi forum
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https://theauctioncentre.atgportals.net/past-auctions/srtheau10396/lot-details/98305ad9-73b0-4c26-b65e-b47c0103603e
A Roland System 100, model 103 Mixing Amplifier for use with an analogue synthesiser, made in Japan,
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