The class-A circuit used in the EQ-73 is similar to the EQ section in the classical 1073 module, without the high pass filter.
The class-A circuit used in the EQ-73 is similar to the EQ section in the classical 1073 module, without the high pass filter. Additional frequencies have been added and the mid frequency band uses two inductors, the higher value of the second one is used for the two lowest frequencies, 160 Hz and 240 Hz, to achieve a suitable response.