Best way to do 1 RCA output to 2 amps and vice versa ?

[TerryD]

I have a DVD player I want to run to my old Voice of Music tube amp "and" to my Marantz 1030 SS amp but never both at the same time as they are using the same speakers via a reverse speaker switch.

Also want to run a tube mono radio and the DVD to the same AUX RCA inputs on the Voce of Music tube amp.

Whats the best way for two RCAs to one?

[sluckey]

A switch.