Pre-73 Mk III This filter is active in

This filter is active in about the same frequency range as the presence peak and therefore lowers it when it is engaged

3 or 6 dB @ 30 kHz

5:1 dual bobbin transformer by a reputed transformer factory

Do experiment with mic placement and with the filters

Pre-73 Mk III This filter is active inThe PRE 73 MKIII 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. The circuit used in the PRE 73 MKIII is similar to the preamp section