this is the MM- and MC- (3 times) switch of Silvercores latest Step-Up product. It allows to calibrate three MC carts (1:10, 1:20 and impedances) as well as a MM cart thus connecting 4 cartridges. The Silvercore switch carries two silver plated mono step ups. The switching is done by relais. Therefore you need a power module.

I will test it and come back with my experiences.

I am using quite some good MMs, Lyra Olympus, Allnic Puritas, Ultra Eminent BC (all three going via MC). The MM with 1:10, 169pf – the MCs with 1:20, 117 Ohm. I will switch the MCs between 59 and 39 Ohm as well.