Switching between 2 amps , 1 set of speakers?

@tommypenngotti  I believe @jcarcopo is using a switch between his amps. If you haven't discussed with him, might be worth doing so.

mrdecibel - all I have on the Sony amp is a Rec Out , no pre amp out , so I may be out of luck , no volume/eq control ....?

back of receiver : 
http://www.canuckaudiomart.com/details/152037-sony_strv7_receiver__rare__serviced/images/182077/

Tommy , coming out of the Sony record out will not give you any volume or tone adjustment into the Marantz, but will allow your Sony to be used as a tuner, and / or the ability to listen to anything else connected through the Sony. Your volume will be through the Marantz. If you want some tone adjustment, you would need an eq of some kind connected through the Marantz. I would not feel the Sony worthwhile driving the Tekton DI se directly, as long as you have the Marantz. Just my opinion. Enjoy ! MrD.

Hi Tommy,
Your problem can easily solve, find tube preamplifier ( ARC, CJ or Dynco Pas- ng) that have two output and multiple inpyt. you can connect your two Amplifier and play.additional info,all external unit like cd,turntable etc.you can connect in input in tube preamplifier.
 Enjoy