If you are using a SUT into a 47k load you are pretty much screwed if you think that the higher the load the better. . let's say that your SUT has 10x turns ratio. Loading is given by
Resistive-load / square-of-turns-ratio
In this example: 47000 / 100 = 470
I agree with Syntax that loading dampens. But I don't agree that there is much difference between 470 and 47000. There is a miniscule voltage drop at 470. Now, at 10 ohms there is huge damping and a loss of about half the output (can't recall the calculations but I think this is in the ballpark) and there is no question that you can hear this and that it can make a harsh system sound tolerable. It can also tame a rising high end in the cartridge and / or ringing.
Why manufacturers state > 100 is because there isn't much difference. Below 100 you begin to notice the effects of damping.
I use a SUT (16x) into 47k (tube phono pre) for an effective impedance of 180 ohms. That is the "best" I can do with my SUT. I compared it to my SS at 47k and heard no degradation in the high end and transient attack.
Just my considered opinion...
Resistive-load / square-of-turns-ratio
In this example: 47000 / 100 = 470
I agree with Syntax that loading dampens. But I don't agree that there is much difference between 470 and 47000. There is a miniscule voltage drop at 470. Now, at 10 ohms there is huge damping and a loss of about half the output (can't recall the calculations but I think this is in the ballpark) and there is no question that you can hear this and that it can make a harsh system sound tolerable. It can also tame a rising high end in the cartridge and / or ringing.
Why manufacturers state > 100 is because there isn't much difference. Below 100 you begin to notice the effects of damping.
I use a SUT (16x) into 47k (tube phono pre) for an effective impedance of 180 ohms. That is the "best" I can do with my SUT. I compared it to my SS at 47k and heard no degradation in the high end and transient attack.
Just my considered opinion...