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ARP 3620 Keyboard S&H - IMF3958 Dual FET Substitution? - SynthWizard - 04-01-2020
ARP 3620 Keyboard S&H - IMF3958 Dual FET Substitution?
CA3140 is the input impedance king.
http://electro-music.com/forum/viewtopic.php?p=444029#444029