JFET Mike Preamp/Equalizer

Some typical Voltages are;

Battery 9 VDC

Drain  7.1 VDC

Source 1.8 VDC

Gate= near Zero

The 1 Mfd. Output Cap is non-polar.  To RF proof the input I put a miniature 470 micro henry choke in series between the gate input and the 10-20 megohm resistor along with a 18 pf cap from gate  to ground at JFET. All short leads please !  You may build the circuit without pots. Full bass boost would be up in the drain near +9 VDC the .1 across a fixed 10K Resistor, which is good feeding many transmitters. In most cases I would use a pot for treble/sibilance boost control running more boost when my signal was weak at the other end, less when strong.