STATEC EQ69 2023 - Nero

500 series passive equalizer inspired by the British console of the 60's.

This design utilizes That 1246/1646 integrated circuit combo for balanced input/output duties and a discrete amp for make up gain after the passive equalizer circuit.

Three bands are available:

a 10Khz fixed frequency with up to 10 db of boost or cut operated by a 11 position switch.

a mid band section with frequency selection operated by a 8 position rotary switch, a toggle switch for boost or cut selection and potentiometer for gain adjustment.

a rotary switch to select low frequency boost or an hpf with up to 15 dB of cut at 50Hz

an on/off switch with true bypass.

The mid and low bands are inductor based. The inductor are hand wound and tested one by one.