The "Rat" (if a single unit is used in stereo mode) requires two 9V batteries and a charger (figure $30 for this @ Target, or a lot more @ RS). Other than decent sound it is dead quiet (no mains hum). To me it sounds better than the NAD stand alone unit and it easily beats any vintage budget receiver phono section that I have heard (the exception being the phono preamp in the Advent 300 receiver).
The downside is that the battery needs to be recharged every 3-5 days and it needs to be left on 7/24 for it to sound good (you will require two batteries, charging one while using the other).
So figure $60 plus the hassle.
If you want to save a few $ I do know where some of the units may be left for $16 (plus shipping) VS $25 @ RS.
For an inexpensive "plug in" phono preamp look on Ebay for a vintage Realistic/Radio Shack 42-2101. I suspect that this unit may have been designed by J. Curl (or @ least based on one of his early designs). My Rats run as dual mono's are better, but the vintage model is still a good performer and it is without the hassle of battery power. Figure $20-$25 for one of these, plus shipping (I would not pay more). I used the vintage units as dual mono's as well (my cheap/easy way of beefing up the power supply in order to increase dynamics), but one, in stereo, still sounded good.
The downside is that the battery needs to be recharged every 3-5 days and it needs to be left on 7/24 for it to sound good (you will require two batteries, charging one while using the other).
So figure $60 plus the hassle.
If you want to save a few $ I do know where some of the units may be left for $16 (plus shipping) VS $25 @ RS.
For an inexpensive "plug in" phono preamp look on Ebay for a vintage Realistic/Radio Shack 42-2101. I suspect that this unit may have been designed by J. Curl (or @ least based on one of his early designs). My Rats run as dual mono's are better, but the vintage model is still a good performer and it is without the hassle of battery power. Figure $20-$25 for one of these, plus shipping (I would not pay more). I used the vintage units as dual mono's as well (my cheap/easy way of beefing up the power supply in order to increase dynamics), but one, in stereo, still sounded good.