via The Analog Lab
"It’s interesting to see the progression of ARP’s filter design when these are lined up next to each other. Being an early model, 4012 is mainly discrete transistor pairs. The 4023 is a 12db/octave filter based around 2 CA3080s and was used in the earliest ARP Odysseys. The 4034, used in the Pro Soloist, is a transistor ladder filter using CA3086s. For the sake of comparison, we included an ARP 4075 in the pic. It’s one of the later and most widely used of the ARP filters (used in Odysseys, Omnis, etc). This is based on a LM3900 quad Norton amplifier (this is a specialized op amp) with discrete matched transistor pairs."
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