PreAmp Hook up question

I have a Harmon Kardon Citation 11 Pre amp and a Mistral 307 B Integrated Tube Amp 

I would like to know if I can plug in the Citation pre amp "OUT "into the Mistral's RCA Auxillary "IN ". This will bypass the Mistrals pre amp section.

I want to use the Citation Pre amp ONLY ...The Citation has phono stage built in.

Will this cause a problem ?...Is this okay ?