Use of seperate preamp with an integrated amp

I have a Conrad Johnson Premier 3 that I would like to be able to use its phono stage connected to an integrated amp. I have been told that I could run a RCA from the CJ's tape output into a line level input on the integrated to use for this purpose. I alternate between two integrated amps (Rogue Audio Cronus Magnum II and a Tandberg 3012A). Would I be able to do this? I don't want to risk damaging any of these amps (obviously). 
Of course. Line Out is Line Out. Perfectly fine.
Please check with Rogue Audio to make sure if the Cronus Magnum II need to connected to a load while it is turned on.