If you only use a single source i.e. dac only, put the BAM between the dac and the pre-amp. Output from your dac to the input of the BAM, output from the BAM to the input of your pre-amp. You will need one extra pair of interconnects.
If you use multiple source - Your pre has tape in and tape out rca's on the back. Using two pairs of interconnects, take the pre's tape out put into the BAM's input, take the BAM's output and connect it to the pre's tape input.
If you use multiple source - Your pre has tape in and tape out rca's on the back. Using two pairs of interconnects, take the pre's tape out put into the BAM's input, take the BAM's output and connect it to the pre's tape input.