You are lucky to have an SK-5A. It will do justice to a front end even better than the one you have now (I use a Cardas Heart Reference and soon a Koetsu Rosewood Signature). Stan Klyne still repairs this unit, too, the last I heard.
The SK-5A allows you to set input impedance and high frequency contour for just about any cartridge, but some of the setting has to be done through trial and error. If you know the cartridge manufacturer's recommended phono preamp impedance in ohms, that will be the right place to start.
It sounds as though you don't have the owner's manual for your SK-5A. The procedure is set out there, and example settings are given (unfortunately there is none for the BPS :-( ). I have a manual and can help you with this. Feel free to email me.
The SK-5A allows you to set input impedance and high frequency contour for just about any cartridge, but some of the setting has to be done through trial and error. If you know the cartridge manufacturer's recommended phono preamp impedance in ohms, that will be the right place to start.
It sounds as though you don't have the owner's manual for your SK-5A. The procedure is set out there, and example settings are given (unfortunately there is none for the BPS :-( ). I have a manual and can help you with this. Feel free to email me.