Not adviseable. There'd be impedance mismatch between the pre-out and the integrated's line level input. Preamps typically have 1k 1v output which can overdrive the line level input typically at 20k 100mv sensitivity. If you just want the preamp's phono stage, use its fixed tape out line level output to connnect to your integrated's CD or aux input. That way you only use the one volume control, that of your integrated.