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Learning about SUT's

Like amplifiers and pre-amps you don't match impedance you bridge output impedance ratios. This prevents the MC out put levels from dropping and from compromising the frequency response and introducing premature distortion. Like wise the SUT has to see the proper load also, which is assumed to be 47Kohms with 65 pf. But hook up cables can compromise there also. So I'll stick with pre-amps designed to take MC phono levels to line levels where you can select the best impedance for the cartridge and the connecting cables between the phono pre-amp and the line level input of the Stereo pre-amp is little effected by choice of cables. Now the cable between the MC and the separate phono pre-amp should be selected some care and kept short.
 
I've attached a simplified model that I put together for a friend with an SUT and a tube preamp. It includes modelling info for his SUT, his cartridge and his PU arm, as well as the input impedance for his preamp and the interconnects.
There are a variety of load options that can be applied, and the overall response simulated.
This is for illustration purposes only.
SUTetcmodel.png
 
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