edw wrote:brianmch wrote:How do you do that Edw? I always thought that an SUT used a MM input whose load is fixed at 47k on the Cube SE? When Dip switch 1 is in the MM position the others are off aren’t they?
How much different is sound from the SUT than the internal gain system?
The Lehmann Decade phono pre has a socket to add a custom resistor (no soldering needed). Your Lehmann Black Cube should have one too. I believe all their phono pre's do. Generally, SUT's do input into a phono's pre MM/47,000 Ohms. But you can change the loading to something different that is more optimal for your cart by adding a parallel resistor at the phono pre. There is a mathematical formula to do this. For example:
I use both my SUTs at the 15x turns ratio setting. This means the cart will see loading resistance equal to 47,000/15^2 or 208.9 Ohms.
The Dyna 20x2L typically likes to see 50-100 Ohms resistance in my experience. Too high a resistance and it will sound too bright. So you can add a parallel resistor to bring the resistance down from 208.9 Ohms. A "Y" RCA connector with the correct resistor soldered into a shielded RCA plug will work, but Lehmann Audio (and a few other pre's) has a dedicated socket for this that makes it easy. I use a 30,000 Ohms parallel resistor:
30,000 = 1 / [(1/Z) - (1/47,000)]
1/30,000 = 1/Z - 1/47,000
1/30,000 + 1/47,000 = 1/Z
18,312 = Z
then...
18,312/15^2 = 81.4 Ohms
As for the sound, you will be amazed at the increased dynamics, soundstage, and musicality, among other things, that an SUT brings. Even between my SUT's there is a difference.