Single-channel vintage style 3-band equalizer that uses the class-A circuit which is similar to the EQ section in the classical 1073 module, only without the high pass filter. Its sound character is warm, punchy, sweet and musical. 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. The equalizer has stepped frequency controls that offers a wide selection of frequencies from 20 Hz to 24 kHz. The Low and High frequency bands are shelving and the mid frequency band is of the bell type. The control range is +/-15 dB for the two lower bands and +/- 18dB for the high frequency band. There are separate bypass switches for all three bands. The equalizer is made to be used together with one of GAP PRE-73 models that have an Insert jack. It can also be used with many other units that have a low level insert jack. Other features include tantalum capacitor in the signal path, TRS jack for in- and output connection and selectable ground lift switch. The equalizer uses external power supply to avoid interaction with the audio circuitry. A 230V power adaptor is included.