This killer pairing is a sweet addition for any outboard rack!
The class-A circuit used in the EQ-73 MKII 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.
The PRE-73 MKII is a one-channel vintage style microphone, line and instrument preamplifier. The signal path uses only discrete components like resistors, capacitors and transistors. The in and output is transformer balanced, using two different transformers, each one optimized for its purpose. This is the way audio components were built before integrated circuits became available.
These two units are lightly used, and we'll ship them along with the UNITE Rack Kit, their original boxes, and power supplies! Feel free to give us a call with any questions you may have about them!