Single Input, Multi Output, RCA Switchbox??

Hi all. Not sure which section this would go in. I am looking for a switchbox or similar piece of equipment for my headphone system.

I have a single source which has RCA output, and a number of amps with RCA input. I am thus looking for a switchbox which does the OPPOSITE of pretty much all switchboxes I have come across while searching: single RCA input, multiple RCA output.

Any suggestions?

Thanks in advance,
X