Bottlehead Forum

Bottlehead Kits => Eros Phono => Topic started by: thegage on May 01, 2016, 12:40:00 PM

Title: Customize Input Impedance?
Post by: thegage on May 01, 2016, 12:40:00 PM

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

John K.

Title: Re: Customize Input Impedance?
Post by: Doc B. on May 01, 2016, 01:20:44 PM

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.

Title: Re: Customize Input Impedance?
Post by: thegage on May 01, 2016, 02:06:24 PM

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.