I use to own an ARC SP6B many years ago.It is factory set at 47k.What is the output of your cartridge in Millivolts?
If its 2.5Mv or lowere you may need to purchase a pre-preamp to get sufficient output.I used a Music Reference head amp to output my moving coil that needed the 100 ohm load.
If you have very specific questions that need addressed I would contact Lenord at ARC.He is very knowledgable of all the classic ARC pieces and he will gladly assist you over the phone.He has helped me several times and is a kind soul.
I don't think on this preamp you have provisions for changing resistor values internally.
If its 2.5Mv or lowere you may need to purchase a pre-preamp to get sufficient output.I used a Music Reference head amp to output my moving coil that needed the 100 ohm load.
If you have very specific questions that need addressed I would contact Lenord at ARC.He is very knowledgable of all the classic ARC pieces and he will gladly assist you over the phone.He has helped me several times and is a kind soul.
I don't think on this preamp you have provisions for changing resistor values internally.