dynco pat 4 preamp phono stage.

You will need to take the output from the Dynaco PAT 4 tape output using stereo RCA cables.   Feed this into the McCormack preamp at the line level input - Tuner, Tape in, Aux in, etc.   It will work just fine, the line level input of the PAT4 is not used and the Phono section of the McCormack isn't used unless you have two turntables or two tonearms.   

Thank you I hooked it sounds good but not as Lound thats OK.