Originally Posted by commsysman
The 2100 has a phono preamp, but not a very good one.
"A phono stage based on the well-received Zphono preamp is included."
I found that the Zphono is indeed
"When the music emerged, I heard sinuous strings sweeping across a big, wide soundstage; percussive acoustic guitar churning from the left channel; eerily realistic tambourine coming from the right channel; bass and drums at the rear of the stage, presented in a way that was clear, powerful, and easy to follow; that surreal bowed saw wavering and warbling, sounding like a choir of weeping spirits; and, finally, the fragile, childlike voice singing "Time, all th' long red lines / that take control / of all th' smokelike streams / that flow into your dreams . . ."
A general comment. Building a fine MM RIAA phono preamp is pretty much a cookbook project. Excellent chips for the purpose such as the 5532 have been around for decades. Good discrete circuits for the purpose preceded that. A critical performance parameter is the accuracy of the equalization network, but that problem was solved with the publication of a well-known and widely applauded JAES article on the topic a few decades ago.