Receiver as Tuner

Using the "pre-amp out" on your receiver should not cause any damage, but you would have two volume controls when listening to radio. Would recommend setting the volume on the receiver to about 40%.

The other option is to connect a "tape out" from your receiver to your preamp. The Tape Out of a receiver is not effected by the volume control.

Depending on the quality of your receiver, one method may sound better than the other. (just remember that the two methods may produce considerably different volume levels).

Just use the tape out, and select tuner. This will be a
fixed output, and will avoid the twin volume concerns.

Thanks. I followed your advice and used the tape out. It's working fine for now. Time for some tuner research.