Tube Equalizer Schematic. Neumann pev equalizer ear 825 passive tube eq sontec 430c eq sontec mep250a pultec pe1a equalizer pultec hlf3 passive high low cut filter pultec meq5 eq section amek m 2500 eq stage. Updated power supply schematic groovewatt tube valve riaa phono preamp.
Two adjustments can be made. First while the preamp has nearly 45 db gain you can get a little more by using quality 100 uf 16 v capacitors on the cathodes of both gain stages. The following scheme diagram is the four 4 band equalizer circuit.
This circuit operated with 12vdc symmetrical dual polarity power supply.
Tube tec mp1a preamp ntp 179 270 mic pre and compressor amek m 2500 mic pre stage calrec ua8000 mic line input stage calrec 1061 input channel w eq. The following scheme diagram is the four 4 band equalizer circuit. That is not a baxandall eq circuit it is an active one tube gyrator type of eq. Updated schematic groovewatt tube valve riaa phono preamp.
