Choose proper load resistance for MC step-up transformer

Hi there everybody,

I'm hoping for a pointer to where I can read up on the proper termination of MC step-up transformers.

I'm lucky enough to have a pair of Tamura TKS-27 input transformers. I also have a Denon DL103 cartridge.

According to Discussion on MC Cartridge Loading, the proper input impedance for a DL103 is 100 ohms. OK, the TKS-27 has a 150 ohm primary, which should be close enough.

So, my question is... If the TKS-27 transformer says its secondary impedance is 100k ohms, is it OK to terminate it into the typical 47k load resistor on the input of the phono preamp?

Or... Since this is a step-up *ratio* we're talking about here, am I then effectively turning that nominally 100k secondary into a 47k secondary, and I need to adjust which primary I use to compensate?

It would seem to me that terminating a 100k secondary with a 47k ohm resistor would be trouble. Am I doing this wrong?

My phono preamp probably has a pretty high input capacitance. The input tube is a triode-wired 6J52P, with a 9k plate resistor, IR LED for cathode bias, 15mA plate current. I have been using the preamp with a 1000 ohm input load resistor (grid leak resistor) and a Denon DL110 (high output MC cartridge, 160 ohm output Z).

Thanks for any help. As you can tell, I haven't done this SUT thing before...

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