>Can you operate a pre-amp from this ?
This question is confusing as phrased, and perhaps that is why no one has addressed it. We'll need you to describe in a couple sentences what you're trying to do.
But the answer probably is no, since there are no pre/power jacks. The analog in will accept a CD or DVD player, but you don't avoid the preamp functions built into the Sharp.
you could hook a preamp up to the analog input, & then connect your sources to that. but, as stated, it will not bypass the preamp circuitry of the sharp. but, if ya yust max'd out the sharp's gain control & left it there, then functionally at least, the preamp would operate the sharp as if it were an amp.
in fact, i run a creek obh-12 in this fashion, thru a line input of my melos preamp, when i wanna do direct a-b comparisons of tunas...

in my case, the creek is wirtually transparent. but, i set the melos' gain to a level such that the creek's wolume is max'd out for desired leistening level, as that's the piece i want removed from the sonic equation...
doug s.