"50 cm" = ~19.6 inches!!!!
Probably you meant to write "50mm", but I wouldn't know for sure.
I thought I read in one of Art Dudley's commentaries that the SPU required special mounting and/or tonearm adaptation. Dkarmeli's post suggests I was correct; the cartridge directly mates to the headshell mount on the arm wand. So I imagine you cannot either twist the cartridge in its mount to achieve, say, Baerwald geometry, nor move it fore and aft so as to achieve correct pivot to stylus distance. You have to take into account its stylus to mount distance when siting your tonearm pivot.
Probably you meant to write "50mm", but I wouldn't know for sure.
I thought I read in one of Art Dudley's commentaries that the SPU required special mounting and/or tonearm adaptation. Dkarmeli's post suggests I was correct; the cartridge directly mates to the headshell mount on the arm wand. So I imagine you cannot either twist the cartridge in its mount to achieve, say, Baerwald geometry, nor move it fore and aft so as to achieve correct pivot to stylus distance. You have to take into account its stylus to mount distance when siting your tonearm pivot.