Has anyone used an Input splitter?

Not to ignore your question ... just some quick questions first. Does the preamp that you are considering have a separate phono input or are all three inputs line level inputs? If the preamp does not have a separate phono input ... does your turntable have its own built in step-up device? On a preamp, the turntable input is not the same as a line level input ... so you will still need an outboard ... just a different type.

Regards, Rich

Sima makes a good one that has automatic switching for video sources and remote control. It has 4 inputs and two sets of outputs. It even has a couple of digital ins and outs.

http://www.simacorp.com/products/item.ep.html?session=8a8b0f8e2e7f385045b9d7052b4d19ed&id=339

Radio Shack has one - you could try it and bring it back if it doesn't work out.

Radio Shack does have a really nice switch box. The slightly more expensive one even has a remote. It you want something more sophisticated, try

www.copperbox.com