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Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the shaft hole, Piher PT-15-V15, http://www.piher-nacesa.com/pdf/14-PT15v03.pdf Potentiometer horizontal Piher T-16H Double, http://www.piher-nacesa.com/pdf/22-T16v03.pdf Potentiometer horizontal.

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