Does anyone have experience matching an Icon PS1 MKII with a Soundsmith Zephyr MIMC Star?

Soundsmith specially states a 10:1 ratio SUT is perfect for their low-output MI such as the Star - Transformer use with Soundsmith MI/Fixed coil designs | Soundsmith (sound-smith.com).  A 10:1 SUT should yield 470-ohms load to the cartridge.

However, the Icon manual icon Audio clearly states 100-ohms which does not make sense since their literature on the separate SUT -icon Audio states:   The impedance of a transformer varies according to its load, so in this sense they are self adjusting.

Contact Icon Contact Us | Icon Audio and a get a specific answer.  Does the 10:1 SUT actually load the cartridge at 470-ohms.  Tell them you are using a Soundsmith low output MI that needs 470-ohms.  

I have to suspect Icon installs a resistor across the secondary of the SUT, thereby reducing the load seen by the cartridge to 100 ohms, instead of the expected 470 ohms. Either that or the base load resistor at the MC inputs is 10K ohms instead of the standard 47K ohms. Either way, the problem is easily remedied. But I agree that the seller gave bad advice to ignore the issue entirely.

I have a low output Soundsmith cartridge (Sussurro MkII ES) and it sounds perfect through a 1:10 SUT that shows it a 470KΩ load.

I think you mean 470 ohms, not 470,000 ohms.  But you would not want to load your Sussuro at only 100 ohms.

Thank you Antin for the Soundsmith link. I could not find it. That is reasurring.

I have been in contact with Icon. They made the comment that transformers are largely self adjusting.  I also asked them for a schematic of the MC input. They are telling me that there is no schematic since it is merely a 1:10 ratio passive transformer with a required output load of 47KΩ. And that I should follow Soundsmith's advice.

I have contacted Soundsmith, and supplied them with the PS1 MKII Specs. I  am waiting for a reply.

I am also confused about the 100 Ωs. If Icon is using a 100 Ω resistor across the secondary. Then they should have notified me of that, or sent, what amounts to a schematic showing the 100 Ω resistor across the secondary. Which could easily be removed from the circuit.

My calculations were exactly the same as the Soundsmith link.. The source should see a 470 Ω load. Which is perfect. If the Sussuro is seeing 470 Ω. Then that is what I should expect with the Zephyr Star.

I am anxiously waiting for Soundsmith to weigh in on this. I will let you know what they say. But from what is stated in the link. It seems to imply that a 1:10 SUT should do the job of delivering a 470Ω load.

I am also going to supply Icon with that link. And inquire how the 100 Ω load is being calculated.

Since I am unfamiliar with SUTs. This has proven to be an education for me.

Thanks to all for your responses.