Musical Fidelity Phono preamp loading


I just bought a Musical Fidelity LX-LPS. They are cheap now and I was wanting to use it to experiment with cartridge loading. It comes with 5 different loading plugs that you put into rca jacks in the back. I think. Does anyone have experience with this unit? It comes with no information on how to use the supplied rca loading plugs. There are two black ones that are closed-back lugs. Instructions say the blue ringed ones are for typical MM carts, and the green ringed ones are for typical MC carts. That’s all the information on those. Then there are three sets of open backed rca lugs. The sheet says the white ones are 1K. Ohms I guess. The red ones are listed as 200 ohm. The yellow ones are 500 ohm. But these are open at the back and accept an rca plug. The circuit is not complete unless something gets plugged into them. Would the rca phono outputs get plugged into these? Or the black lugs?  So far the test MM and MC cartridges I’m using sound best without the black plugs inserted. They seem to attenuate output. That is my guess. I have no idea how to use the other lugs to see what they do.  I’ve contacted the manufacturer but they just said contact the dealer. I contacted music direct but not heard back. Given that this is the weekend I’m not expecting to hear from them. So if any of you can help I’d like to experiment with this unit this weekend. Maybe I’m the  only one on the planet that doesn’t just know how to use this thing, but I’m still surprised there is zero instructions with the unit. And no review or other online instructions I can find. Thanks for any tips on use. 
vinylfan62

Showing 4 responses by vinylfan62

Thanks. I have gotten that far. There are more loading plugs included. These are open at the back and don’t seem to be a complete circuit without something plugged into them. That’s the mystery. I won’t be buying any other Musical Fidelity products after contacting them and being told to see the dealer. Dealer has no documentation either. 
Thanks. I did figure out the black lugs with blue or green rings. It was the other three sets that I was unsure about how I would use them. I think I have it now. Amazing that a company would put this much thought into a product and then not document or support it. I have bought from the in the past, but I won’t be buying from Musical Fidelity again. 
That makes more sense than other advice I’ve gotten so far on the open ended plugs. Thanks!
Mine came with several other sets of loading plugs. I received sets for 200 ohm, 500 and 1K. None offered better sound for any of the cartridges I own, but it’s nice that I can use these plugs with any value resistor I want when I buy a new cartridge.  This wasn’t a feature mentioned on the product website so it was a pleasant surprise when I opened the box. I can’t understand why they included them but don’t advertise it. Seems like it would attract buyers.