Customize Input Impedance?

[thegage]

Is is possible to customize the input impedance of the Eros? If so, how difficult?

John K.

 

[Doc B]

You just change the 47K resistor across the input grid for whatever value you want. Going lower is not a problem and going higher is only a problem if you approach 1Mohm.

 

[thegage]

Thanks! I haven't built a Bottlehead kit since a S.E.X. amp a number of years back (and a Foreplay and Seduction before that), but I bought a new MC cartridge recently with a slightly odd output (0.8mV) that doesn't quite match my current phono stage, and it seems like a good excuse for a new project.

John K.