Both of the phono preamps you mention are excellent units in their price range. I have heard the MF, and owned the Lehmann Black Cube SE for several years. Of the two, I preferred the Black Cube. Either of these phono preamps will provide a significant improvement over the phono stage in your Yamaha receiver.
I live in Seattle, so if you'd like to talk further about phono preamps, feel free to call me at 206-772-1909.
Scott C-
I live in Seattle, so if you'd like to talk further about phono preamps, feel free to call me at 206-772-1909.
Scott C-