It depends on the phono stage. Most have more than one input, but few offer ease of loading that would accomodate different cartridges, and make it practical.
First thing: Fantastic phono stage - I'm listening to the Chicago "Live @ Carnagie Hall" 4 LP set now! You can use 2 or more with each input. I have A VAC Ren. Sig. Mk. II with phono & only use mc cartridges. I have 2 arms on my Verdier La Platin & use 2 armwands for my 12" Morch DP-6 along with a 12" Da Vinci Grandezza. I also use a Oracle Anniversary with Breuer Dynamic arm on my second table. It's this easy: Just switch the phono cables on either mc or mm input & use the switch on the back of the pre amp (as per Swampwalker) for the correct input. You may have to open the pre amp to switch cartridge loadings. Will soon put my new modded Rhea into play & can use 5+ cartridge/arm combinations (including mono) without moving from my chair - except to cue (play/stop). You can also use a step up transformer & use the mm input for another mc cartridge.
The manual for my VAC Ren says that the phono stage which has 2 inputs (one MM and one MC) can be hooked up to 2 diff. tables. There is a back apron switch that selects between the two. My old Yamaha C2a had 2 seperate phono inputs.
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