While using one phono preamp with multiple inputs is great (and is what I do at present) others swear by optimizing the phono preamp to the needs of the cartridge driving it -- so for your mono arm you can use a dedicated mono phono stage such as this http://www.thoeress.com/en/phono-enhancer/
I have two arms and am just adjusting my setup with the use of a step up stage which I have specified to have two inputs and the ability to switch between them, the phono stage I am moving to is a straight through single input design with 40dB of gain only so needs a step up
I have two arms and am just adjusting my setup with the use of a step up stage which I have specified to have two inputs and the ability to switch between them, the phono stage I am moving to is a straight through single input design with 40dB of gain only so needs a step up