Tube amp for Spendor S3/5 SE

Recently acquired a pair of Spendor S3/5 SE from a Audiogon member. I am an audio enthusiast and mostly listens to Vocals at low to moderate volume. I never tried Tubes and really want to try them. Could you guys recommend me a tube amp in ~$1000 range. Because of easy biasing, i thought of trying Primaluna Prologue One, but i am afraid it will be underpowered for Spendors.