Cartridge impedance loading question

Stringreen...the OP's Lehmann has dip switches inside. He could put the cover back on, but leave the screws off until he found the right setting.

I think even you could handle that? :-)

The correct loading for the cartridge is 47K.

However, this may result in radio frequency bursts that might disturb the preamp. That is why it is equipped with loading options. The RFI (Radio Frequency Interference) is caused by the excitation of the RF circuit formed by the cartridge inductance and the capacitance of the interconnect cable. The loading detunes the circuit so the RF bursts cannot occur.

Generally speaking, the higher the load impedance the better, while at the same time being sufficient to detune the RF circuit such that no interference is heard (which will manifest as a brightness).

Another way to put this is that if tonality is unchanged, go with the highest impedance you can. This will allow more output from the cartridge.

I owned that excellent cartridge and loaded it at 100 Ohms.

The correct loading for the cartridge is 47K ?

There is no "correct" loading. Assuming you're going straight in, why don't you start at 100 ohms as suggested by Shelter and adjust it to taste?
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1077125197&openfrom&1&4#1

I've used this cartridge for a number of years.
My various phono stages have all been of the moving magnet kind, 47Kohms at input. I have adjusted loading by means of different step up transformers.

For a long time I used an sut that reflected a load of 470 ohms back to the shelter, while stepping up its output voltage by 10 times. (aka 1:10 turns ratio)

And I enjoyed the cartridge quite a lot at this loading.

I have also loaded this cartridge at 209 ohms by using a sut with a turns ratio of 1:15.

With regard to your options with the Black Cube I'd try it at both 100 ohms and then 470 ohms. Choose between those.

I haven't tried it, but it has been suggested to me by someone who has that a 1000 ohm setting works very good with the 501-II. For me that would require an SUT with a 1:5 turns ratio.

My phono stages that I have used with the Shelter have been tubed, except for a couple that I tried for brief periods and returned. I haven't tried the Black Cube.
Current stage is a Hagerman Trumpet which I find quite ageeable with the rest of my signal chain.

And, of course, your mileage might (and probably will) vary.

-Steve

-Steve