Walrus
Well-known member
I thought I'd have a play with an old Shure Germanium Phono/Mic/Tape pre.
In the attached schematic, I've deleted the components that gave the equalisation for Phono and Tape, which leaves an amp with
63dB of gain and input Z of about 20k (according to the data sheet).
I want to use an OEP A262A3E wired 1:6.45 on the input so I can add phantom easily, but this adds even more gain!
Is it possible to make one of the resistors variable, to act as a gain control?
In the attached schematic, I've deleted the components that gave the equalisation for Phono and Tape, which leaves an amp with
63dB of gain and input Z of about 20k (according to the data sheet).
I want to use an OEP A262A3E wired 1:6.45 on the input so I can add phantom easily, but this adds even more gain!
Is it possible to make one of the resistors variable, to act as a gain control?