Warner,
I have a pair of Straight Wire brand splitters that are pretty nicely built. They seem to be machined out of a block of solid metal. They have one male RCA jack that plugs into your pre-amp. Then you have a nice machined block on the back of the pre-amp that provides 2 female RCA jacks/channel.
I previously used these with no obvious sonic degredation.
If you need a photo, let me know. I can send it in e-mail.
Enjoy,
TIC