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Pultec EQ
Pultec founders Gene Shenk and Ollie Summerland
created the first passive program EQ in 1951. This was a
really game changer. The EQP-1A upgraded version had
a gain makeup stage using a push-pull design with
12AU7, 12AX7 and 6X4 vacuum tubes. It also had
modified low-frequency boost and attenuation response
curves, 2 additional peak boost frequencies and 2 high
frequency shelf boost curves.
You can check below the Waves PuigTec EQs, modeled
on rare vintage Pultec EQs.