In response to Bigtee's proven expertise in AI pre-amps, let me opine that, to my ears, the best input on the L1 is to use the tape input for your most favored line source.
Also, a belated thanks to Bigtee for informing me where the dip switches were on my L1. Thanks!
Also, a belated thanks to Bigtee for informing me where the dip switches were on my L1. Thanks!