basic passive preamp

Thank you - in response to the question source is nad cd player and amp is nad 2600, but those may change.  George I didn't understand your post re what are on ebay for under $100.  And how does the sound quality of the Schitt compare to the others including the tortuga?    

Looks like the luminous is perfect - is the sound quality comparable to say a Tortuga or a placette?  Also, I would imagine there aren't many of these on the used market - should I purchase direct through the manufacturer?