CB presence control

[chrisrbr]

starting to build a ggg guvnor. may mod to be similiar to CB.  any idea where the CB presence control is located?  perhaps on that last filter near the output, the one with a 4.7K and .022uf from the older ver schem??

thanks for any ideas

[slacker]

I think the presence control is a trim pot in place of the 4k7 resistor, or a trim in series with a smaller resistor.

[chrisrbr]

thanks, that was my guess too