The input impedance of the amplifier should be equal to or higher than the output impedance of the preamp. Since paractically it is impossible to match the input and output impedance exactly, all you have to do is to be mindful that the amplifier's input impedance is higher than the output impedance of the preamp. This will be true for both SS and tube amplifiers fed by a tube preamp. So, it really will not be a mismatch to use a SS amp which has a higher imput impedance than the SP-2B.
Output Impadence for Musical Design SP-2B
I want to know if anyone can tell me the output impadence for the Musical Design SP-2B linestage. I recently purchased this tube preamp used and would like to know the output impadence so that I can have an idea as to which power amps it can work with. I have e-mailed Musical Design but they haven't gotten back to me so I figured I'll throw this question up in the air for someone to help me out with. Thanks