Here is a quote from an e-mail that I got from Knut at Conrad Johnson as I was trying to figure out what amp to purchase about 9 months ago. ""If you use for example a PV10B or PV14L together with the SA250, then the result is that you will hear more detail overall, and the sound will be truer overall. These two preamplifiers, PV10B &PV14L are really appropriate for this amp, and make the SA250 sound even better.""
I do agree with the other replies that CJ MF line of amps will sound better than the Sonograph for not much more $$$.
I anded up bying a MV-55 after all.
Keep us posted to what you decide on doing.
cheers, Shahen