I agree Dave and it's one of the reasons I think the CST will not be ideal for my Spectral but it looks good for my Shinon.
As per my calculations if the CST has a turns ratio of 1:10 and my Shinon has an Output of 1.0mV and an internal impedance of 60 Ohms, then the output my MC Stage will see will be 8.87mV, but more importantly the SUT will give a reflected load of 470 Ohms or 7.8x the internal impedance of the cartridge.
The Spectral however, with its 0.2mV and 2 Ohms impedance will see 2mV at the MC Stage, which by itself is manageable, however the problem will be the reflected load of 470 Ohms which is 235x
the internal impedance of the cartridge. Not ideal at all.
With the FRT-4 SUT I use the 3 Ohms tap which has a turns ratio of 35.8 and therefore the MC Stage sees 6.8mV and I get a reflective load of 36.6 Ohms or 18.3x the internal impedance of the cartridge.